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Leni [432]
3 years ago
5

Calcium carbonate, CaCO3(s), decomposes upon heating to give CaO(s) and CO2(g). A sample of CaCO3 is decomposed, and the carbon

dioxide is collected in a sealed 250 mL flask. After the decomposition is complete, the gas has a pressure of 1.3 atm at a temperature of 33°C. How many moles of CO2 gas were generated? (Ideal gas equation:
Chemistry
2 answers:
vovangra [49]3 years ago
8 0

Answer:

0.013 mole

Explanation:

Step 1:

Data obtained from the question. This includes:

Volume (V) = 250 mL

Pressure (P) = 1.3 atm

Temperature (T) = 33°C

Number of mole of (n) =?

Step 2:

Conversion to appropriate units.

The volume and the temperature given in the question must be converted to their appropriate unit in order to obtain the answer to the question in the right unit.

For volume:

We must, convert mL to L

1000 mL = 1 L

Therefore, 250 mL = 250/1000 = 0.25 L

For temperature:

We, must convert °C to K.

K = °C + 273

K = 33°C + 273

K = 306K

Step 3:

Determination of the number of mole of CO2.

Applying the ideal gas equation:

PV = nRT

The number of mole of CO2 can be obtained as follow:

V = 0.25 L

P = 1.3 atm

T = 306K

R (gas constant) = 0.082atm.L/Kmol

Number of mole of (n) =?

PV = nRT

1.3 x 0.25 = n x 0.082 x 306

Divide both side by 0.082 x 306

n = (1.3 x 0.25) /(0.082 x 306)

n = 0.013 mole

tatyana61 [14]3 years ago
7 0

Answer:

n_{CO_2}=0.013molCO_2

Explanation:

Hello,

In this case, the undergoing chemical reaction is:

CaCO_3(s)\rightarrow CaO(s)+CO_2(g)

Thus, over the given conditions, we use the ideal gas equation to compute the moles of carbon dioxide that were generated directly, as it is the only gaseous species:

PV=n_{CO_2}RT\\\\n_{CO_2}=\frac{PV}{RT} =\frac{1.3atm*250mL*\frac{1L}{1000mL} }{0.082\frac{atm*L}{mol*K}*(33+273.15)K} \\\\n_{CO_2}=0.013molCO_2

Best regards.

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Determine the molecular geometry based on the description of bonding and lone pairs of electrons around the central atom. Three
Inessa05 [86]

Answer:

Three double bonds and no lone pairs of electrons- trigonal planar

Two single bonds and two lone pairs of electrons-bent

Five single bonds and no lone pairs of electrons- trigonal bipyramidal

Three single bonds and one lone pair of electrons- trigonal pyramidal

Two double bonds and no lone pairs of electrons - linear

Four single bonds and no lone pairs of electrons- tetrahedral

Six single bonds and no lone pairs of electrons- octahedral

Explanation:

The valence shell electron pair repulsion theory gives a description of the shape of a molecule based on the number of regions of electron density present on the valence shell of the central atom of the molecule.

The molecules are distorted away from the shape predicted on the basis of the VSEPR by the presence of lone pairs on the valence shell of the central atom in the molecule. In the absence of lone pairs, the shape of a molecule is exactly the shape predicted on the basis of the VSEPR theory.

5 0
3 years ago
How many moles (of molecules or formula units) are in each sample? 79.34 g cf2cl2?
Alona [7]
From the periodic table:
molecular mass of carbon = 12 grams
molecular mass of fluorine = 18.99 grams
molecular mass of chlorine = 35.5 grams
Therefore:
one mole of CF2Cl2 = 12 + 2(18.99) + 2(35.5) = 120.98 grams
Therefore, we can use cross multiplication to find the number of moles in 79.34 grams as follows:
mass = (79.34 x 1) / 120.98 = 0.6558 moles

Now, one mole contains 6.022 x 10^23 molecules, therefore:
number of molecules in 0.65548 moles = 0.6558 x 6.022 x 10^23
                                                              = 3.949 x 10^23 molecules
7 0
3 years ago
Determine the molar mass of a 0.458-gram sample of gas having a volume of 1.20 l at 287 k and 0.980 atm. group of answer choices
lilavasa [31]

Considering the ideal gas law and the definition of molar mass, the molar mass of the sample of gas is 9.17 \frac{g}{mol}.

<h3>Ideal gas law</h3>

An ideal gas is a theoretical gas that is considered to be composed of randomly moving point particles that do not interact with each other. Gases in general are ideal when they are at high temperatures and low pressures.

The pressure, P, the temperature, T, and the volume, V, of an ideal gas, are related by a simple formula called the ideal gas law:

P×V = n×R×T

where:

  • P is the gas pressure.
  • V is the volume that occupies.
  • T is its temperature.
  • R is the ideal gas constant. The universal constant of ideal gases R has the same value for all gaseous substances.
  • n is the number of moles of the gas.

<h3>Definition of molar mass</h3>

The molar mass of substance is a property defined as its mass per unit quantity of substance, in other words, molar mass is the amount of mass that a substance contains in one mole.

<h3>Molar mass of the sample of gas</h3>

In this case you know:

  • P= 0.980 arm
  • V= 1.20 L
  • T= 287 K
  • R= 0.082 \frac{atmL}{molK}
  • n= ?

Replacing in the ideal gas law:

0.980 atm× 1.20 L= n× 0.082\frac{atmL}{molK}× 287 K

Solving:

(0.980 atm× 1.20 L)÷ (0.082\frac{atmL}{molK}× 287 K)= n

<u><em>0.04997 moles= n</em></u>

On the other hand, you know that the<u><em> mass of the sample of gas</em></u> is <u><em>0.458 grams</em></u>. Replacing in the definition of molar mass:

molar mass=\frac{0.458 grams}{0.04997 moles}

Solving:

<u><em>molar mass= 9.17 </em></u>\frac{g}{mol}

Finally, the molar mass of the sample of gas is 9.17 \frac{g}{mol}.

Learn more about

molar mass:

brainly.com/question/5216907

brainly.com/question/11209783

brainly.com/question/7132033

brainly.com/question/17249726

ideal gas law:

brainly.com/question/4147359

#SPJ1

6 0
2 years ago
How many moles in 30.0 grams of h3po4
jok3333 [9.3K]
Molar mass H₃PO₄ = 98.0 g/mol

1 mole ----- 98.0 g
? mole ------ 30.0 g

moles = 30.0 * 1 / 98.0

= 0.306 moles

hope this helps!


5 0
3 years ago
5. What could you do to convert from meters to centimeters? *
maria [59]

C.

centi- is essentially 10^2 of one meter.

If you had 100m, multiplying 100 by 10^2 (or 100) would give you 10000 cm.

7 0
3 years ago
Read 2 more answers
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