Answers
Answer: 3.613x10^24
Explanation: Avogadro’s number represents the number of atoms in one mole of substance: 6.022x10^23 atoms/mole. Multiplying the number of moles by this number reveals that, in this sample, 3.613x10^24 atoms of methane are present.
Answer: A
Explanation: When using dimensional analysis, always put similar unit-ed numbers diagnolly from each other so they 'cross out'
For example, If you had 1 mol of gold and you wanted to convert it to grams using gold's molar mass, 196.97 g/mol, it would look like this:
Start with the given number over nothing:
[tex]\frac{1 mol Au}{} *\frac{ }{ }[/tex]
Then add your conversion, in this case the molar mass, with the MOLES on the BOTTOM, so they are diagnol with the 1 mol of Au
[tex]\frac{1 mol Au}{ } *\frac{196.7 g Au}{1 mol}[/tex]
Always have the top right in your dimensional analysis be in the units that you are solving for. In this case, we went from moles to grams, so grams is in the top right.
Hope this helps!
Also, 6.02 x 10²³ is otherwise known as avogadros number- it is used when you are converting something from moles to molecules (or particles). For example, if instead we were going from moles of gold to molecules of gold, our dimensional analysis would look like this:
[tex]\frac{1 mol Au}{ } *\frac{6.02 x 10^2^3 molecules Au}{1 mol}[/tex]
Related Questions
Which physical properties do glass and ice share? Select the two correct
answerS.
DA Density
D B. State
DC. Melting point
D D. Brittleness
SUBMIT
Answers
B, C
verified just did it
B. State
C. Melting Point
Both ice and glass comes under the category of solids since they have definite shape and definite volume. Both the ice and glass allows light to pass through it, that means they are transparent in nature.Ice floats, we can infer that ice must be less dense than water. If water is frozen in a glass jar, the glass jar breaks. This implies they both have similar densities.Thus, options B and C are correct.
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How much silver phosphate is produced if 10 g of silver acetate is reacted with excess sodium phosphate?
Answers
Answer:
Calculate the mass of silver phosphate produced if 30.0 grams of silver acetate completely reacts with sodium phosphate.
According to stoichiometry of the balanced chemical reaction between silver phosphate and silver acetate 8.359 g silver phosphate is produced if 10 g of silver acetate is reacted with excess sodium phosphate.
What is stoichiometry?It is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.
Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.In the given reaction 500.73 g of silver acetate produces 418.58 g silver phosphate, thus 10 g silver acetate is produced when 10×418.58/500.73 =8.359 g.
Thus, 8.359 g silver phosphate is produced if 10 g of silver acetate is reacted with excess sodium phosphate.
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How is a scientific law different from other laws in society?
O A. A scientific law is a rule about how to treat and punish people.
B. A scientific law describes what always happens under specific conditions in nature. O C. A scientific law serves to protect people, property, and nature from harm.
O D. A scientific law is what scientists have decided should be forced to happen in nature.
Answers
Answer:
The answer will be A
Explanation:
A scientific law is based on repeated experiments or observations, that describe or predict a range of natural phenomena. A scientific law is something that is unexpected
Answer:
B
Explanation:
It just is.......
Can all molecules become all states of matter?
Answers
Answer:
Yep i think so.
Explanation:
Pretty sure molecules examples of things in matter...you might wanna double check tho
What is the gravitational potential energy of a 5 kg object that is 150
meters above the surface of the Earth?
Answers
Explanation:
Gravitational potential energy
= mgh
= (5kg)(9.81N/kg)(150m)
= 7357.5J.
Answer:
[tex]\boxed {\boxed {\sf 7350 \ Joules}}[/tex]
Explanation:
Gravitational potential energy can be found using the following formula:
[tex]E_P=m*g*h[/tex]
Where m is the mass, g is the gravitational acceleration, and h is the height.
The mass of the object is 5 kilograms. On Earth, the acceleration due to gravity is 9.8 meters per square second. The height is 150 meters.
[tex]m= 5 \ kg \\g= 9.8 \ m/s^2 \\h= 150 \ m[/tex]
Substitute the values into the formula.
[tex]E_p=(5 \ kg)(9.8 \ m/s^2)(150 \ m)[/tex]
Multiply the first two numbers.
[tex]E_P=(49 \ kg*m/s^2)(150 \ m)[/tex]
1 kg*m/s² is equal to 1 Newton.49 kg*m/s²= 49 N[tex]E_p=(49 \ N)(150 \ m)[/tex]
Multiply.
[tex]E_p=7350 \ N*m[/tex]
1 Newton meter equals 1 Joule 7350 N*m= 7350 J[tex]E_p= 7350 \ J[/tex]
The gravitational potential energy of the object is 7350 Joules
How long does it take for 87.5 % of each isotope(Krypton-73, Krypton-74, Krypton-76, and Krypton-81) to decay?
Answers
2nd half-life: 50%/2 = 25% + 50% (from first half-life)
3rd half-life: 25%/2 = 12.5% + 75% (from first and second half-lives
I looked it up...
how does reducing the temperature of chemical reaction affect the rate at which it occurs?
Answers
Answer:
When you lower the temperature, the molecules are slower and collide less. That temperature drop lowers the rate of the reaction. When you increase the pressure, the molecules have less space in which they can move. That greater density of molecules increases the number of collisions.
Explanation:
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If u can...
im just bored and my friend fell asleep on me :/
Temperature measures the average kinetic energy of particles of the substances. Therefore, reducing the temperature of chemical reaction reduces rate of reaction.
What is temperature?Temperature is used to measure degree or intensity of heat of a particular substance. Temperature is measured by an instrument called thermometer.
Temperature can be measured in degree Celsius °c, Kelvin k or in Fahrenheit. Temperature is a physical quantity. Heat always flow from higher temperature source to lower temperature source.
When the temperature is reduced, the molecules move more slowly and collide less. The reaction's pace is slowed as the temperature drops. When the pressure is increased, the molecules have much less area to travel in. The number of collisions rises as the density of molecules increases.
Therefore, reducing the temperature of chemical reaction reduces rate of reaction.
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This table shows the pH values of different solutions. A 2-column table with 4 rows. The first column labeled solution has entries W, X, Y, Z. The second column labeled p H has entries 6, 5, 1, 3. Which ranks the solutions from the strongest to weakest acid? W X Y Z Y W X Z W X Z Y Y Z X W
Answers
Answer:
D- Y -Z -X -W
:)
The solution with lowest pH are more acidic and those with higher pH values are basic. The given solutions can be ranked from the strongest to weakest acid as Y Z X W.
What is pH?pH of a solution is the measure of its H+ ion concentration. Mathematically it is the negative logarithm of H+ ion concentration of the solution. The acidic solutions contains more H+ ions.
A pH value of 7 represents a neutral solution. The pH above 7 is basic solution and a solution with pH below 7 is acidic in nature. A pH scale can be used to measure the range.
The pH of 1 and 3 indicates strong acidic solutions and 5 and 6 are weakly acidic . The lowest value of pH indicates highest acidity. Therefore, the correct order is Y Z X W.
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how can one separate and collect the solvent from a salt solution
Answers
EXAMPLE: water can be separated from salt solution, because water has a much lower boiling point than salt. When the solution is heated, the water evaporates.
A gas mixture with a total pressure of 745 mmHg contains each of the following gases at the indicated partial pressures: CO2, 125 mmHg; Ar, 214 mmHg; and O2, 187 mmHg. The mixture also contains helium gas. What is the partial pressure of the helium gas
Answers
Answer:
219 mmHg
Explanation:
The partial pressure of a gas refers to the pressure exerted by one of the gases in a mixture of gases.
The total pressure of a gas is the sum of all the partial pressures of all the gases in the mixture.
Since the total pressure = 745 mmHg
The partial pressure of helium is;
745 - (125 + 214 + 187)
Partial Pressure of helium gas= 219 mmHg
please help ASAP ty :)
Answers
Answer:
c or d it measures smallest to biggest and biggest to smallest
Answer:
your answer is a
Explanation:
Can someone fill out the chart please?
Answers
Answer:
LOL i don't even know
Explanation:
please help !!!!!!!!!!!
Answers
Answer:
Iron wood is very dense and will sink in water. B
Explanation:
Hope this helps!!
Answer:
B
Explanation:
What is a general rule that you can make that would help you to figure out how to bond ions together
Answers
Answer:
metal and non metal-electrovalent
How does knowing the meaning of prefix-trans help you remember what happens to light that strikes a translucent object ?
Answers
Explanation:
The prefix trans- and its variant tra- mean "across".
A translucent substance allows some light to go "across" it to the other side. Also, think about a transparent substance: it allows light to go "across" it; or a translation, it is a going "across" from one language into another.
How many total valence electrons are found in the following molecules: CO3
Answers
Answer:
The Carbonate (CO2−3) Ion
Unlike O3, though, the actual structure of CO32− is an average of three resonance structures. 2. Carbon has 4 valence electrons, each oxygen has 6 valence electrons, and there are 2 more for the −2 charge. This gives 4 + (3 × 6) + 2 = 24 valence electrons
Explanation:
Potassium + Bromine
Lewis dot diagram
Answers
Answer:
Explanation:
.. | .. | -
K. + : Br . ----> K⁺ | : Br : |
.. | .. |
Divergent tectonic plate boundaries most commonly form one: A non-volcanic islands. B ocean trenches C continental mountains D ocean ridges
Answers
Answer:
D. ocean ridges
Explanation:
Answer:
I think A
Explanation:
Most volcanoes form at the boundaries of Earth's tectonic plates. ... The two types of plate boundaries that are most likely to produce volcanic activity are divergent plate boundaries and convergent plate boundaries
3. What mass of water vapor condenses if 435 kJ of heat are released in the process? a a 10.79 b 982 g C 1.30 x 10 g d 1939
Answers
Mass of water vapor = 193 g
Further explanationGiven
435 kJ of heat are released
Required
mass of water vapor
Solution
The heat to change the phase can be formulated :
Q = mLf (melting/freezing)
Q = mLv (vaporization/condensation)
Lv for water = 2256 kJ/kg or 2256 J/g or 40.7 kJ/mol
So the mass of water vapor :
[tex]\tt m=\dfrac{Q}{Lv}\\\\m=\dfrac{435000~J}{2256~J/g}\\\\m=192.8\approx 193~g[/tex]
hhelp will give brainliest
Answers
Answer: pretty sure it is D
Answer:
its the last one
Explanation:
HELP!! I WILL GIVE BRAINLIEST
Earth's magnetic reversals are recorded in
A. the asthenosphere
B. sea-floor rock
C. deep-ocean trenches
D. the mantle
Answers
n the diagram shown, when an object ‘X’ is brought near the ring shaped magnet, the magnet moves away from it. Four friends are discussing what they can say about X. Nikhil: X can be a piece of any metal. Shailaja: X can only be a piece of iron. Akash: X is definitely a magnet. Vinay: X can neither be a magnet or an iron piece. Who is correct?
Answers
Answer:
Akash
Explanation:
it could be a magnet with the same poles facing eachoher
Cobalt (Co) has an atomic mass of 59 and an atomic number of 27. Which statement correctly describes an atom of cobalt?
A. An atom of cobalt contains more neutrons than protons.
B. An atom of cobalt contains more electrons than protons.
C. An atom of cobalt contains the same number of neutrons and protons.
D. An atom of cobalt contains the same number of neutrons, electrons and protons.
Answers
Answer:
A
Explanation:
27 us the number of protons when we subtract 27 from 59 it will be 32 because a mass number is the sum of proton and neutron but tell u more on the comment
Answer: A - An atom of cobalt contains more neutrons than protons.
Explanation: The atomic number is the number of protons in an atom. The atomic mass is the sum of protons & neutrons in an atom. So, with simple math we can figure out the number of neutrons. Total 59 - 27 protons = 32 neutrons. Which means that A is the only right answer in this case.
Little Extra: A & B would both be correct if Cobalt was a negatively charged ion. An atom is an ion if it is charged, and an ion is either negatively charged or positively charged. For example, if Cobalt had 27 protons & 26 electrons it's overall charge would be positive since it has more protons than electrons. And it would be negatively charged if Cobalt had 27 protons & 28 electrons. No charge if there are 27 protons & 27 electrons because proton +1 and electron -1. Imagine 27-27=0 no charge, 27-26= +1 charge, 27-28= -1 charge
I hope this made you smarter.
Complete the passage:
During the process of polymerization____
combine by sharing electrons. This process forms a
,____which is made of repeating subunits. The resulting material is used in a variety of ways.
Answers
Answer:
During the process of polymerization, monomers
combine by sharing electrons. This process forms a polymer, which is made of repeating subunits. The resulting material is used in a variety of ways.
Answer:
monomers and polymer.
Explanation:
A body is moving with an acceleration of 60 m/s2. If the force applied to t
body is 42000 N, calculate its mass
Answers
Explanation:
Fnet = ma
m = Fnet/a = 42,000N/(60m/s²) = 700kg.
Ed made pancakes from batter, freshly squeezed orange juice, fried eggs, and a strawberry fruit salad. Identify the chemical changes that occur to the food items during breakfast preparation
Answers
Answer:
Warming the batter and frying the eggs.
Explanation:
This is a chemical change as the products have very different property as compared to reactant not only physically but also chemically. Therefore, the reaction that is associated with cooking is combustion reaction.
What is chemical change?
Chemical change is a reaction in which breaking and forming of new bonds take place. One molecule completely converted to totally different molecule. The number of atoms remains same
One famous example of chemical change is the rusting of iron. The color, odor and arrangements of atoms in products are very much different from reactant. Chemical change are mostly irreversible in nature.
Cooking is a chemical change not a physical change. During cooking the reaction that is associated is combustion reaction as the by product is carbon dioxide and water.
Therefore, the reaction that is associated with cooking is combustion reaction.
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What is the percent composition of Ca(C2H3O2)2?
Select one:
a. 25.3% Ca, 30.4% C, 3.8% H, 40.5% O
b. 40.4% Ca, 24.2% C, 3.1% H, 32.3% O
c. 6.67% Ca, 26.67% C, 40.0% H, 26.67% O
d. 12.5% Ca, 25% C, 37.5% H, 25% O
Answers
Answer:
a
Explanation:
relative formula mass of Ca(C2H3O2)2=158
% for Ca=25.3
% for C=30.4
% for H=3.8
% for O=40.5
Answer:
Choice a. The compound [tex]\rm Ca(C_2 H_3 O_2)_2[/tex] contains approximately [tex]25.3\%\; \rm Ca[/tex], by mass, approximately [tex]30.4\%\; \rm C[/tex] by mass, approximately [tex]3.8\%\; \rm H[/tex] by mass, and approximately [tex]40.5\%\; \rm O[/tex] by mass.
Explanation:
Look up the relative atomic mass of these elements on a modern periodic table:
[tex]\rm Ca[/tex]: [tex]40.078[/tex].[tex]\rm C[/tex]: [tex]12.011[/tex].[tex]\rm H[/tex]: [tex]1.008[/tex].[tex]\rm O[/tex]: [tex]15.999[/tex].The relative atomic mass of an element gives the numerical value of the mass (in grams) of one mole of the atoms of this element. For example, the relative atomic mass of hydrogen is [tex]1.008[/tex]. Therefore, the mass of one mole of hydrogen atoms would be (approximately) [tex]1.008\; \rm g[/tex].
One mole of [tex]\rm Ca(C_2 H_3 O_2)_2[/tex] formula units include:
[tex]1\; \rm mol[/tex] of [tex]\rm Ca[/tex] atoms, and[tex]2\; \rm mol[/tex] of [tex]\rm (C_2H_3O_2)^{-}[/tex] ions.Inside each mole of [tex]\rm (C_2H_3O_2)^{-}[/tex] ions, there are:
[tex]2\; \rm mol[/tex] of [tex]\rm C[/tex] atoms,[tex]3\; \rm mol[/tex] of [tex]\rm H[/tex] atoms, and[tex]2\; \rm mol[/tex] of [tex]\rm O[/tex] atoms.Therefore, that [tex]2\; \rm mol[/tex] of [tex]\rm (C_2H_3O_2)^{-}[/tex] ions in one mole of [tex]\rm Ca(C_2 H_3 O_2)_2[/tex] formula units would include:
[tex]2\; \rm mol \times 2 = 4\; \rm mol[/tex] of [tex]\rm C[/tex] atoms,[tex]3\; \rm mol \times 2 = 6\; \rm mol[/tex] of [tex]\rm H[/tex] atoms, and[tex]2\; \rm mol \times 2 = 4\; \rm mol[/tex] of [tex]\rm O[/tex] atoms.In summary, each mole of [tex]\rm Ca(C_2 H_3 O_2)_2[/tex] formula units would contain:
[tex]1\; \rm mol[/tex] of [tex]\rm Ca[/tex] atoms,[tex]4\; \rm mol[/tex] of [tex]\rm C[/tex] atoms,[tex]6\; \rm mol[/tex] of [tex]\rm H[/tex] atoms, and[tex]4\; \rm mol[/tex] of [tex]\rm O[/tex] atoms.Calculate the mass of these atoms using their relative atomic mass data.
For example, the mass of one mole of [tex]\rm H[/tex] atoms is (approximately) [tex]1.008\; \rm g[/tex] because the relative atomic mass of hydrogen is [tex]1.008[/tex]. Therefore, the mass of that [tex]6\; \rm mol[/tex] of hydrogen atoms would be approximately:
[tex]6\; \rm mol \times 1.008\; \rm g \cdot mol^{-1} = 6.048\; \rm g[/tex].
Similarly, calculate the mass of the other three elements in one mole of [tex]\rm Ca(C_2 H_3 O_2)_2[/tex] formula units:
[tex]40.078\; \rm g[/tex] of [tex]\rm Ca[/tex].[tex]48.044\; \rm g[/tex] of [tex]\rm C[/tex].[tex]6.048\; \rm g[/tex] of [tex]\rm H[/tex].[tex]63.996\; \rm g[/tex] of [tex]\rm O[/tex].The sum of these masses is [tex]158.166\; \rm g[/tex].
In other words, the mass of one mole of [tex]\rm Ca(C_2 H_3 O_2)_2[/tex] formula units is (approximately) [tex]158.166\; \rm g[/tex]. Approximately [tex]40.078\; \rm g[/tex] of that is [tex]\rm Ca[/tex]. Therefore, the percentage of [tex]\rm Ca\![/tex] by mass in [tex]\rm Ca(C_2 H_3 O_2)_2\![/tex] would be approximately:
[tex]\begin{aligned}&100\%\times \frac{40.078\; \rm g}{158.166\; \rm g} \quad \genfrac{}{}{0pt}{}{\leftarrow\text{mass of $\mathrm{Ca}$ in $\mathrm{Ca(C_2 H_3 O_2)_2}$}}{\leftarrow\text{mass of $\mathrm{Ca(C_2 H_3 O_2)_2}$}}\\ & \approx 25.3\% \end{aligned}[/tex].
In other words, [tex]\rm Ca[/tex] accounts for approximately [tex]25.3\%[/tex] of the mass of [tex]\rm Ca(C_2 H_3 O_2)_2\![/tex].
In a similar way, calculate the percentage of the other three elements by mass.
[tex]\rm C[/tex]: approximately [tex]30.4\%[/tex].[tex]\rm H[/tex]: approximately [tex]3.8\%[/tex].[tex]\rm O[/tex]: approximately [tex]40.5\%[/tex].The nervous system involves actions that control
Answers
Answer:
The peripheral nervous system can be further divided into the autonomic system, which regulates involuntary actions, and the somatic system, which controls voluntary actions.
Explanation:
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Answer: voluntary actions.
Explanation:The peripheral nervous system can be further divided into the autonomic system, which regulates involuntary actions, and the somatic system, which controls voluntary actions.
in terms of their electron configurations, why is cesium more likely to lose its valence electron than potassium?
use the term “shielding” in your response if possible
Answers
Explanation:
use the term electron sheilding, the more electrons between the valence el3ctron and nucleus the easier to lose the valence electron (more sheilding = easier to lose)
During the formation of ammonia, what mass of Hydrogen gas would be required to react completely with 42g of nitrogen gas?
Answers
Answer:
9 grams
Explanation:
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