The percent by mass of H₂O in the hydrated compound, Na₂CO₃.xH₂O = 64.13%
Further explanationGiven
90 g sample Na₂CO₃.xH₂O
32.28 g Na₂CO₃
Required
The percent by mass of H₂O
Solution
mass of H₂O = mass of sample - mass of the anhydrous salt, Na₂CO₃
[tex]\tt mass~H_2O=90-32.28=57.72~g[/tex]
The percent by mass :
[tex]\tt \%mass~H_2O=\dfrac{mass~H_2O}{mass~sample}\times 100\%\\\\\%mass~H_2O=\dfrac{57.72}{90}\times 100\%\\\\\%mass~H_2O=64.13\%[/tex]
the CO2 molecule has which of the following characteristics
Answer:
The carbon dioxide molecule is linear and centrosymmetric at equilibrium. The carbon–oxygen bond length is 116.3 pm, noticeably shorter than the bond length of a C–O single bond and even shorter than most other C–O multiply-bonded functional groups. Since it is centrosymmetric, the molecule has no electrical dipole.
Explanation:
Answer:
The carbon dioxide molecule is linear and centrosymmetric at equilibrium. The carbon–oxygen bond length is 116.3 pm, noticeably shorter than the bond length of a C–O single bond and even shorter than most other C–O multiply-bonded functional groups. Since it is centrosymmetric, the molecule has no electrical dipole.
Carbon dioxide | CO2 | CID 280 - structure, chemical names, physical and chemical ... It is a one-carbon compound, a gas molecular entity and a carbon oxide. ... Physical and Thermodynamic Properties of Pure Chemicals Data Compilation. ... These actions are exploited clinically in the use of hyperventilation to diminish ...
Molecular Formula: CO2
PubChem CID: 280
Molecular Weight: 44.009 g/mol
Chemical Safety: Laboratory Chemical Safety
What information does a solubility table give?
Answer:
A solubility chart with a list of ions
Explanation:
when mixed with other ions, they can become precipitates or remain aqueous. The following chart shows the solubility of multiple independent and various compounds, in water, at a pressure of 1 atm and at room temperature (approx. 293.15 K).
Answer:
it tells which compounds will dissolve in water
Explanation:
a p e x :)
Describe are seasons like near the equator.
Answer:
Hi! Think of it like this:
You and your family are going to go on a vaction for the holidays, to south america or somewhere else. You´re near the equator so it will be warm. If you were to move there, you might pull out the swimsiutes because most of the time, its useally warm and sunny. They dont really get cold weather. They will have a nice and warm christmas.
Organism that consist of many cells?
Answer:
Multicellular Organisms.
Explanation:
Hi
ANSWER
d is the corresect answer
Answer:
d is the correct answer
Explanation:
4 gramos de cafe soluble, 20 gramos de azucar y agua hasta completar 200 ml, Calcula la concentración (%m/v) de todas las sustancias que forman el refresco
Answer:
2 % de cafe, 20% de azucar, 100% de agua.
Explanation:
Un clásico problema de soluciones:
- Nuestros solutos son 4 g de cafe y 20 g de azúcar.
- en 200 mL de agua
Podemos asumir que los 200mL es el volumen de solución.
%m/v es un tipo de concentración que señala los gramos de soluto en 100 mL de solución.
% m/v de cafe → (4/200) . 100 = 2 %
% m/v de azucar → (20/200) . 100 = 20 %
Si tomamos al agua como sustancia que forma parte de la solución sería
(200/200) . 100 = 100 %
Lo que podríamos leer 100 g de agua en 100 mL de agua, dado que la densidad del agua es 1 g/mL
4. Substances that existed before mixing-still exist-after substances-are-mixed----
True of false
Which compound has the strongest hydrogen bonding at STP?
1. H2O 3. H2Se
2. H2S 4. H2Te
Word equation of almininum reaction with oxygen
Answer:
Aluminium + oxygen = almininum oxide
Hope it helps!! Please make me brainliest...
Merry Christmas good day
How many grams of water would require 2250 joules of heat to raise it’s temperature from 34.0 C to 100.0 C ?
Answer:
8.117grams
Explanation:
its obtained from Q=MCT where
Q-HEAT REQUIRED
C-SPECIFIC HEAT CAPACITY OF WATER
M-MASS OF WATER
T-TEMPERATURE CHANGE(100C-34C)
*
When Gallium becomes an ion it loses 3 electrons to become:
A: -3
B: +3
C: It loses 3 electrons to become a neutral atom
D: It is already neutral
Answer:
B: +3
Explanation:
If Gallium loses 3 electrons, it will become an ion.
The ion will be positively charged because in this new ion, the number of electrons is lesser than the number of protons. The charge difference will impart a positive net charge on the ion.
In a neutral atom, the number of electrons and protons are the same. For positively charged ions, the number of protons is greater than the electronsIf Gallium the loss of 3 electrons offsets the charge balance in the chemical specie. Thus, the ion will have a net +3 charge.
Calculate: (5.03 x 109) – (42.6 x 108) =
Answer: x108(5.03x−42.6)
Explanation: Factor 5.03x109−42.6x108
5.03x109−42.6x108
=x108(5.03x−42.6)
___C + ___S8 → ___CS2
Answer:
4,1,4
Explanation:
Balancing a synthesis equation
How does the Periodic Table work and what is it? What are periods and groups?
Answer:
The columns of the periodic table are called groups. Members of the same group in the table have the same number of electrons in the outermost shells of their atoms and form bonds of the same type. The horizontal rows are called periods.
3 The weight of an atom is determined primarily by —
A) the total number of protons plus neutrons
B) the total number of protons plus electrons
C) the total number of neutrons plus electrons
D) the total number of electrons, protons, and neutrons
Answer:
A)The total number of protons plus neutrons= Weight of an atom
PLEASE HELP DUE RIGHT NOW!!!!
(03.06 MC)
Why is a depletion of the ozone layer harmful? (2 points)
Select one:
a. It increases chlorofluorocarbons (CFCs).
b. It allows increased amounts of UV radiation to reach Earth's surface.
c. It increases crop yields.
d. It contaminates ground water.
Answer:
b.
Explanation:
As the ozone layer is essential for nullifying the rays of the sun, without it there would be much more UV radiation.
Calculate normality and tire of KOH solution , if CN H2 C2 O4 solution , that is nessesary for titration is 0.1050 mol/1 and the Volume is 5.0 ml ; the volume of KOH - solution is 4.5 ml
Answer:
Normality of KOH = 0.1062 N
Note: The given question is not clearly stated. A related question below is answered and explained;
What is the NORMALITY of a solution of KOH if 45.18 mL are required to neutralize 0.3g of pure oxalic acid H2C2O4 . 2H2O?
Explanation:
Equation of the reaction: 2KOH + H₂C₂O₄.2H₂O --> K₂C₂O₄ + 4H₂O
molar mass 0f KOH = 56 g/mol; molar mass of H₂C₂O₄.2H₂O = 126 g/mol
Number of moles of in 0.3 g of H₂C₂O₄.2H₂O = mass/molar mass
number of moles = 0.3 g / 126 g/mol = 0.0024 moles
From the equation of reaction, 2 moles of KOH are required to neutralize 1 mole of H₂C₂O₄.2H₂O
Number of moles of KOH required to neutralize 0.0024 moles of H₂C₂O₄.2H₂O = 2 * 0.0024 = 0.0048 moles
Molar concentration of 45.18 mL solution of KOH containing 0.0048 moles of KOH = number of moles/volume (L)
molarity of KOH solution = (0.0048/45.18 mL) * (1000 mL/1 L) = 0.1062 mol/L
Normality = n * molarity
where is the number of moles of OH⁻ ions produces from mole of KOH = 1
Normality of KOH = 1 * 0.1062
Normality of KOH = 0.1062 N
I forgot, please help!
Imagine that you could dive deep into the Atlantic Ocean where the South American plate and African plate meet at a plate boundary. What do you think you would see at the plate boundary? Would you see the mantle? Why or why not?
Answer:
At the plate boundary, there would be a divergent boundary where we can see a mid ocean ridge and a gap. We would be able to see the mantle because there would be a fissure from where magma will rise and solidify.
Explanation:
Under the South American plate and African plate, there are currents that cause a divergent boundary. They create this boundary since they pull the tectonic plates apart, causing a mid-ocean ridge with an opening that allows the rising of the magma that was underneath. Once that the magma is out, it solidifies, and the currents will try to create another ridge to repeat the process.
When the plates are apart, the mantle that is beneath is exposed, and we can see the magma.
What is the chemical equation for photosynthesis?
A. carbon dioxide + water + glucose yields sunlight + oxygen
B. glucose + oxygen + water yields carbon dioxide + helium + light energy
C. carbon dioxide + oxygen yields light energy + water
D. carbon dioxide + water + light energy yields glucose + oxygen
Answer:
D.
Explanation:
This is the correct equation for photosynthesis! :)
You have 4.72x10^25 atoms of a substance with MW of 136.94 g/mol How many moles do you have
Number of moles = 78.41
Further explanationThe mole is the number of particles(molecules, atoms, ions) contained in a substance
1 mol = 6.02.10²³ particles
Can be formulated
N=n x No
N = number of particles
n = mol
No = Avogadro's = 6.02.10²³
4.72 x 10²⁵ atoms of a substance, then moles :
[tex]\tt n=\dfrac{N}{No}\\\\n=\dfrac{4.72\times 10^{25}}{6.02\times 10^{23}}\\\\n=78.41[/tex]
what is the bronsted lowry definition of an acid?
Answer:
An acid is the specie which can donate a proton.
Explanation:
Bronsted lower acid:
An acid is the specie which can donate a proton.
Bronsted lower base:
A base is the specie that can accept the proton.
For example:
HCl + NH₃ → NH₄⁺ + Cl⁻
Here in this reaction HCl is act an acid because it donate the proton while NH₃ is Bronsted lower base because it accept the proton.
Bronsted lowery acid = proton donor
Bronsted lowery base = proton accepter
Does the following equation follow the law of conservation of mass? Show your work
AgNO3 → Ag2 + NO3
Answer:
No.
Explanation:
If the equation follows the law of conservation of mass, then the amount of reactants must be equal to the amount of products. That is not the case for the provided equation due to 1 Ag on the reactants side versus 2 Ag on the products side.
what would you need to do to calculate the molarity of 10g of NaCl in 2kg of water?
A. convert the 10 g of NaCl to Kg of NaCl
B. Convert the 10g of NaCl to moles of NaCl
C. Convert the 2kg of water to liters of water
D. Convert the 2kg of water to moles of water
Answer:
B) we will convert the 10 g of NaCl into moles.
Explanation:
Molarity is used to describe the concentration of solution. It tells how many moles are dissolve in per litter of solution.
Formula:
Molarity = number of moles of solute / L of solution
we will convert the 10 g of NaCl into moles.
Number of moles of NaCl:
Number of moles = mass/molar mass
Number of moles = 10 g/ 58.44 gmol
Number of moles = 0.17 mol
1 Kg = 1 L
Molarity = 0.17 mol / 2 L
Molarity = 0.085 mol/L
Molarity = 0.085 M
Answer:
B. Convert the 10g of NaCl to moles of NaCl
What is the bond angle that corresponds to the
geometry associated with C1 in the structure?
A. 120° B. 90O
C. 1800
D. 109.5o
7. Between which bonded elements in the above
structure is there the strongest dipole moment?
A. Carbon to Carbon B. Hydrogen to Carbon
C. Oxygen to Carbon D. Oxygen to Hydrogen
8. What is the geometry associated with the C2 molecule in the structure?
A. linear B. trigonal planar C.bent D. tetrahedral
9. Among the choices below, which correctly describes the bonding taking place in the above structure?
A. 6 sigma bonds, 1 pi bond C. 6 sigma bonds, 2 pi bonds
B. 7 sigma bonds, 1 pi bond D. 7 sigma bonds, 2 pi bonds
What is the electron configuration for zirconlum?
Answer:
1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^6 5s^2 4d^2
Explanation:
Can someone please help me with this?-- 18 pts!
What is true about the latent heat of condensation for a substance?
Select all that apply.
The latent heat of condensation will have the same absolute value as the latent heat of vaporization.
The latent heat of condensation will have the same absolute value as the latent heat of solidification.
The latent heat of condensation is a characteristic property that can be used to identify a substance.
The latent heat of condensation will be negative.
The latent heat of condensation is the same for all substances under the same conditions.
The latent heat of condensation will be positive.
Happy Holidays!!
Answer:
latent heat of condensation will have the same absolute value as the latent heat of vaporization. The latent heat of condensation will be negative. The latent heat of condensation is a characteristic property that can be used to identify a substance.
Explanation:
Answer:
energy absorbed or released by a substance during a change in its physical state (phase) that occurs without changing its temperature.
Explanation:
Use The diagram to make some observations about how he does transferring in each of these situations
do you have some examples or options to answer ?
When a chemical reaction occurs what happens to the properties of the substance
Answer:
the molecules in the reactants interact to form new substances.
Explanation:
How many grams of NaCl would be required
to react with 346 mL of 0.607 M AgNO3
solution?
Answer:
Mass = 12.27 g
Explanation:
Given data:
Mass of NaCl are required = ?
Volume of AgNO₃ = 346 mL (346 mL× 1L/ 1000 mL = 0.346 L)
Molarity of AgNO₃ = 0.607 M
Solution:
Chemical equation:
NaCl + AgNO₃ → NaNO₃ + AgCl
Number of moles of AgNO₃:
Molarity = number of moles / volume in L
0.607 M = number of moles / 0.346 L
number of moles = 0.607 M × 0.346 L
number of moles = 0.21 mol
now we will compare the moles of NaCl and AgNO₃.
AgNO₃ : NaCl
1 : 1
0.21 : 0.21
Mass of NaCl:
Mass = number of moles × molar mass
Mass = 0.21 mol × 58.44 g/mol
Mass = 12.27 g