Question

Lab 14 Molar Volume of Gases:

**Find the molar mass of the NaHCO3 using the following
info, show calculations:**

Barometric pressure (atm): 1.013

Temperature (°C): 18

Mass of Chemical (g): 1.0g

Water Displaced: 206mL

**Find the molar mass of Na2CO3 using the following info,
show calculations:**

Barometric pressure (atm): 1.013

Temperature (°C): 18

Mass of Chemical (g): 1.0g

Water Displaced: 168mL

Answer #1

Q1.

2NaHCO3 + heat --> Na2CO3 + CO2(g) + H2O(g)

so..

total volume of gas = 206 mL

PV = nRT

n = PV/(RT)

n = (1.013)(206*10^-3)/(0.082*(18+273)) = 0.008745 mol of gases

so..

2 mol of Na2HCO3 = 1 mol of CO2 + 1 mol of H2O

so... ratio is 2:2

0.008745 mol of gases = 0.008745 mol of solid

MW= mass/mol = (1)/0.008745 = 114.351 g/mol of NAHCO3

Q2.

Na2CO3 + heat --> Na2O + CO2

similar...

n = (1.013)(168*10^-3)/(0.082*(18+273)) = 0.0071320 mol of gases

1:1 ratio so

MW = mass/mol= 1/0.0071320 = 140.2 G/mol

USE MY TABLE TO ANSWER ALL QUESTIONS
Trial
Barometric Pressure (atm)
Temperature (°C)
Mass of Chemical (g)
Water Displaced (mL)
Trial 1 NaHCO3
1.006973
20C
1.0g
.057L
Trial 2 NaHCO3
1.006973
20C
1.0g
.085L
Trial 3 Na2CO3
1.006973
21C
1.0g
.042L
Trial 4 Na2CO3
1.006973
20C
1.1g
.036L
PART A Show your calculation for the molar volume of CO2 from
Trial 1 according to your experimental data. Show all work, values,
and units in your calculations in order to receive...

Amount of H2) Displaced for each Trial - Grams of
Solute used
Trial
Barometric Pressure
Temperature C
Mass of Chemical
Water Displaced
Trial 1 NaHCO3
1.006973
20.1
1.1 g
.059 L
Trial 2 NaHCO3
1.006973
20
2.0 g
.087 L
Trial 3 Na2CO3
1.006973
22
1.2 g
.044 L
Trial 4 Na2CO3
1.006973
20
1.1 g
.036 L
Use this data to calculate the molar mass:
Trial 1 - Sodium
Bicarbonate
Trial 2 - Sodium
Bicarbonate
Trial 3 - Sodium...

Trial
Pressure( atm)
Temperature(K)
Reactant Mass
Water displaced (L)
Trial 1 NaHCO3
0.993
292.6K
1.0 g
0.163 L
Trial 2 NaHCO3
0.993
292.8 K
1.1 g
0.122L
Trial 3 Sodium Carbonate
0.993
292.7 K
0.9 g
0.125L
Trial 4 Sodium Carbonate
0.993
279.5K
1.0 g
0.112L
Beginning temp 293.15
Show your calculation for the molar volume of CO2
from Trial 1. 2, 3, 4 according to your experimental data. Show all
work, values, and units in your calculations in order...

A welder using a tank
of volume 7.90×10−2 m3 fills it with oxygen (with a
molar mass of 32.0 g/mol ) at a gauge pressure of
3.30×105 Pa and temperature of 35.0 ∘C. Remember that
the guage pressure of the gas in the tank is the difference between
the absolute pressure of the gas inside the tank and the pressure
outside the tank, in this case 1 atm. So the absolute pressure is
equal to the guage pressure plus 1...

Using molar volume (stp) or the ideal gas law equation, determine
the molar mass , g/mole, of each of the fillowin g.
1- 12.5 g of a gas that has a volume of 2.25 L at stp M
=
2- 0.742 g of a gas that has a volume of 835 ml at 1.10 ATM
and 19 degrees C. M=

Determine the molar mass of each of the following gases:
1) 0.78 g of a gas that occupies 500 mL at 0 ∘C and 1.00 atm
(STP).
2) 1.42 g of a gas that occupies 1.15 L at 0 ∘C and 760 mmHg
(STP).
3) 1.57 g of a gas that occupies 1.25 L at 680 mmHg and 19.0
∘C.
4) 2.7 g of a gas that occupies 2.4 L at 0.95 atm and 20 ∘C.

Looking to find the molarity and molar mass of TEABF4 that has
the following:
Pressure = 0.6207 atm
Temperature = 303.25 K
I factor = 2

1. What is the molar mass of a gas if 0.252 g of the gas
occupies a volume of 125 mL at a temperature of 123°C and a
pressure of 778 torr?
2. A mixture of 0.229 g of H2, 1.08 g of
N2, and 0.836 g of Ar is stored in a closed container at
STP. Find the volume (in L) of the container, assuming that the
gases exhibit ideal behavior.

A welder using a tank of volume 7.50×10−2 m3 fills it
with oxygen (with a molar mass of 32.0 g/mol ) at a gauge pressure
of 3.30×105 Pa and temperature of 36.6 ∘C. The tank has
a small leak, and in time some of the oxygen leaks out. On a day
when the temperature is 21.6 ∘C, the gauge pressure of the oxygen
in the tank is 1.95×105 Pa .
A) Find the initial mass of oxygen. kg
B) Find...

In this lab, the point was to find out if mass and volume are
conserved in a chemical experiment. Water was added to water and
measurments were taken. Then, Water was added to acetone and the
same measurement were taken. I know that mass is conserved and
volume is not. I do not understand the following questions:
Does the order of adding water to acetone or acetone to water
change anything? Why or why not?
During this particular experiment, the...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 4 minutes ago

asked 5 minutes ago

asked 7 minutes ago

asked 13 minutes ago

asked 24 minutes ago

asked 31 minutes ago

asked 37 minutes ago

asked 50 minutes ago

asked 52 minutes ago

asked 57 minutes ago

asked 1 hour ago

asked 1 hour ago