Answer:
a) 0.13 bar
b) 5.05 L
Explanation:
Let us take the mass of the mixture to be 100 g. Hence, 70% by weight of dioxygen corresponds to 70 g
Mass of dihydrogen = 100g - 70 g = 30g
Number of moles of dioxygen = 70g/32 g/mol = 2.2 moles of dioxygen
Number of moles of dihydrogen = 30g/2g/mol = 15 moles of dihydrogen
Total number of moles = 2.2 + 15 = 17.2 moles
Mole fraction of dioxygen = 2.2/17.2 = 0.13
Partial pressure = mole fraction * total pressure
Partial pressure of dioxygen = 0.13 * 1 = 0.13 bar
ii) number of moles in 8.8 g of CO2 = 8.8g/44g/mol = 0.2 moles
T = 31.1 + 273 = 304.1 K
P = 1 bar
V= ?
R = 0.083 bar L K-1 mol-1
From
PV=nRT
V = nRT/P
V= 0.2 * 0.083 * 304.1/1
V= 5.05 L
HELP
1) A 400g sample of alcohol (c = 2.43 J/g°C) at 16°C is mixed with 400g
of water (c = 4.19 J/g°C) at 85°C. What is the final temperature of the
mixture?
Answer:
Explanation:
Given data:
Mass of alcohol = 400 g
Specific heat capacity of alcohol = 2.43 J/g°C
Initial temperature of alcohol = 16°C
Mass of water = 400 g
Specific heat capacity of water = 4.19 J/g°C
Initial temperature of water = 85°C
Final temperature of mixture = ?
Solution:
Equation:
m₁c₁ (T₂-T₁ ) = m₂c₂(T₂-T₁)
by putting values,
400 × 4.19 × (T₂ - 85°C) = 400 × 2.43 × (T₂ - 16°C)
1676 × (T₂ - 85°C) = 972 × (T₂ - 16°C)
How many valence electrons do the elements in column 4 have? Are these elements very reactive?
Answer:
Explanation: Elements in group 14 have 4 valence electrons. Meaning that to achieve a stable octet they need to either gain or lose 4 electrons in total. That would take significantly more energy than other elements, e.g., group 1 (alkaline metals) or group 17 (halogens.)
Explanation:
In the periodic table, the elements in column 4 have four valence electrons and are less reactive compared to s- block elements but more reactive than the p-block elements.
What is periodic table?Periodic table is a tabular arrangement of elements in the form of a table. In the periodic table, elements are arranged according to the modern periodic law which states that the properties of elements are a periodic function of their atomic numbers.
It is called as periodic because properties repeat after regular intervals of atomic numbers . It is a tabular arrangement consisting of seven horizontal rows called periods and eighteen vertical columns called groups.
Elements present in the same group have same number of valence electrons and hence have similar properties while elements present in the same period show gradual variation in properties due to addition of one electron for each successive element in a period.
Learn more about periodic table,here:
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Clear selection
2. What is the main function of white blood cells?
10 points
O a. to carry oxgen rich blood
O b. to carry carbon dioxide
O c. to help fight disease
O d. to help build your red blood cells
Answer:
C
Explanation:
To hello fight disease
Which compound has the strongest hydrogen bonding at STP?
1. H2O 3. H2Se
2. H2S 4. H2Te
will give brainlist!!!
21. Which answer best describes the coast?
A. thick deposits of sediments carried off of the shelf
B. the surf area along coastlines
C. 75 mile shallow flat area just off coastlines
D. area of land that drops toward deep ocean basins
Answer:
C
Explanation:
75 mile shallow flat area just off coastlines
9. If one bulb of Christmas lights, connected in series is burned out, what will
happen to the other light bulbs?
A. All other bulbs will no longer work.
B. All other bulbs will continue to light
C. The brightness of the bulbs will increase.
D. The brightness of the bulbs will decrease.
10. Three light bulbs with resistances 2000 , 1600 , and 800 are connected in
series respectively. Which one has the highest brightness when the circuit is
plugged to a 220 V voltage source?
A. 800 2
B. 1600 2
C. 2000 2
D. none of the above
Answer:
A. all other bulbs will no longer work
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:
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
if a aluminum rod was made out of solid glass instead of solid aluminum what would happen.
Answer:
it would break when it hits the ground
Explanation:
How many joules are needed to change the temperature of 25 g of water from 40 C to 100 C?
Answer:
Explanation:
2
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
why is ketchup a physical change
Answer:
Ketchup is not a change, it is a sauce.
Explanation:
Answer:
There is no change in the tomatos structure its "state of matter" you could say is changed, but the actual chemical compoud is the same.
The ionization energies for successive removal of electrons from sodium are as follows: 496kJ, 4562kJ, 6912kJ, and 9544kJ. What does the jump in ionization energy indicate
Answer:
It is difficult to remove electrons from cations because one or more electrons are already lost and hold of nucleus on remaining electrons increase
Explanation:
which of the following substance is most likely basic
Answer:
Please provide answer options. :)
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
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
How many kilograms of iron can be obtained from 100 kilograms of Fe203
Answer:
754
Explanation:
how many grams of hydrogen are required to react completely with 400g nitrogen to form ammonia? Pls help
N2+3H2-->2NH3
first we find the number of nitrogen moles
the molar mass for N2 is 14+14=28g/mole
to find the number of moles we divide the mass by the molar mass
n=400/28=14.28 moles
for 1 mole of N2 we use 3 moles of H2, therefore for 14.28 moles of N2 we use 14.28*3=42.84 moles ofH2
to find the mass of H2 we multiply the number of moles by the molar mass
the molar mass of H2 is 2g/mole
2*42.84=85.68g of H2
What is the differences in the densities of the Continental crust and the oceanic crust and why are they different?
Answer:
Both oceanic crust and continental crust are less dense than the mantle, but oceanic crust is denser than continental crust. ... Because continental crust is less dense than oceanic crust it floats higher on the mantle, just like a piece of Styrofoam floats higher on the water than a piece of wood does
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]
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
ANSWER
d is the corresect answer
Answer:
d is the correct answer
Explanation:
There is a photon with a frequency of 8x10^12 Hz. What is the energy of this
photon?
Answer:
33.085476 meV ≈ 33 meV
Explanation:
Hope this helped!
Which substance is the limiting reactant when 12 g of sulfur reacts with 18 g of oxygen and 24 g of sodium hydroxide according to the following chemical equation?
NaOH is the limiting reactant
Further explanationGiven
12 g of sulfur reacts with 18 g of oxygen and 24 g of sodium hydroxide
Required
The limiting reactant
Solution
Reaction
2 S(s) + 3 O₂(g) + 4 NaOH(aq) ⇒ 2 Na₂SO₄(aq) + 2 H₂O(l)
mol S(MW=32.065 g/mol) :[tex]\tt \dfrac{12}{32.065}=0.374[/tex]
mol O₂(MW=32 g/mol)[tex]\tt \dfrac{18}{32}=0.5625[/tex]
mol NaOH(MW=40 g/mol)[tex]\tt \dfrac{24}{40}=0.6[/tex]
A method that can be used to find limiting reactants is to divide the number of moles of known substances by their respective coefficients, and the smallest ratio becomes a limiting reactant
S : O₂ : NaOH =
[tex]\tt \dfrac{0.374}{2}\div \dfrac{0.5625}{3}\div \dfrac{0.6}{4}=0.187\div 0.1875\div 0.15\Rightarrow NaOH~smallest~ratio[/tex]
How would you compare young soil to soil that has been around a long time?
Answer:
young soil has less organic materiel that old
Explanation:
(2k-1)²
what the answer pls.
Answer:
4k^2-4k+1
Explanation:
Plx give brainlyest
Please help me with this question
Answer:
Moon
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:
A current of 1.5A was passed through two electrolytes arranged
in series for 10 minutes and 2.16 g of silver deposited on the cathode
of the first cell. (Atomic wt. of Ag=108 ,Ni =59) .Calculate
a) The quantity of electricity that passes through the two cells.
b) The amount of Nickel deposited on the cathode of the second cell
containing Nickel(II) nitrate, Ni(NO3)2 ?
Answer:
0.59 g
Explanation:
The reaction at the first cathode;
Ag^+(aq) + e -----> Ag
if Q = It = 1.5 * 10 * 60 = 900C
According to Faraday's second law of electolysis; if we pass the same quantity of electricity through different electrolytes, the mass of substances deposited on each cathode is proportional to the equivalent weights.
Equivalent weight E = Atomic mass/valency
For Ag = 108/1 = 108
For Ni = 59/2 = 29.5
Hence
Let m1 = mass of Ag deposited =2.16
Let m2 = mass of Ni deposited
Let E1 = equivalent weight of Ag
Let E2 = equivalent weight of Ni
m1/m2 = E1/E2
2.16/m2 = 108/29.5
m2 = 2.16 * 29.5/108
m2 = 0.59 g
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: