Chemistry, 02.04.2020 02:43 PastyMexican24

A sample of gas has a mass of 64 g. Its volume is 37.6 L at a temperature of 275k and a pressure of 1.2 atm. Find its molar mass.

Answers: 2

Show answers

Answers

Answer from: franciscovazquez623

The molar mass of the gas sample is 32 g/mol.

Explanation:

Using the ideal gas law, we can determine the number of molecules present in the volume given,

$PV = nRT\\\\n = \frac{PV}{RT}$

Here, Pressure P is given as 1.2 atm, the volume V is given as 37.6 L and temperature is given as 275 K with the gas constant as 0.082 L atm mol⁻¹ K⁻¹.

$n = \frac{1.2*37.6}{275*0.082} = \frac{45.12}{22.55} =2$

So, the 2 moles of gas is present in 64 g of gas sample. Thus, as molar mass is found by the ratio of mass of the sample to its amount of moles present in the sample, the molar mass can be found as below.

$Molar mass = \frac{Mass}{No.of moles} = \frac{64}{2} = 32 g/mol$

So, the molar mass of the gas sample is 32 g/mol.

Answer from: kiramartin3

32.02 grams/mole is the molar mass of the gas.

Explanation:

Data given about the gas:

sample of the gas = 64 grams

volume of the gas = 37.6 L

temperature of the gas = 275K

pressure of the gas = 1.2 atm

R = 0.0821 atm l/mole K

molar mass=?

The data provided will be used to know the molar mass by using ideal gas law equation:

PV = nRT (n = $\frac{mass}{molar mass}$

putting the values in the equation:

n = $\frac{PV}{RT}$

Putting the value of n and then writing the equation:

$\frac{mass}{molar mass}$ = $\frac{PV}{RT}$

putting the values in the equation

molar mass = $\frac{64 X 0.0821 X 275}{37.6 X 1.2}$

= 32.02 grams/mole

Answer from: Quest

when 25.0 ml of 0.700 mol/l naoh was mixed in a calorimeter with 25.0 ml of 0.700 mol/l hcl, both initially at 20.0 °c, the temperature increased to 22.1 °c. the heat capacity of the calorimeter is 279 j/°c.

the equation for the reaction is:

naoh + hcl → nacl + h₂o

moles of hcl = 0.0250 l hcl ×

0.700

mol hcl

1 l hcl = 0.0175 mol hcl

volume of solution = (25.0 + 25.0) ml = 50.0 ml

mass of solution = 50.0 ml soln ×

1.00

ml soln

= 50.0 g soln

δt=t2-t1

= (22.1 – 20.0) °c = 2.1 °c

the heats involved are

heat from neutralization + heat to warm solution + heat to warm calorimeter = 0

q1+q2+q3=0

nδh+mcδt+cδt=0

0.0175 mol ×

δh

+ 50.0 g × 4.184 j·g⁻¹°c⁻¹ × 2.1 °c + 279 j°c⁻¹ × 2.1 °c = 0

0.0175 mol ×

δh

+ 439.32 j + 585.9 j = 0

0.0175 mol ×

δh

= -1025.22 j

δh=1025.22j0.0175 mol= -58 600 j/mol = -58.6 kj/mol

Answer from: Quest

particle p is an electron and particle q is a neutron

Another question on Chemistry

Chemistry, 22.06.2019 01:30

2. how is heavy water different from normal water

Answers: 1

Answer

Chemistry, 22.06.2019 04:30

Use the drop-down menus to answer each question. which runner finished the 100 m race in the least amount of time? which runner stopped running for a few seconds during the race? at what distance did anastasia overtake chloe in the race?

Answers: 1

Answer

Chemistry, 22.06.2019 05:30

Which of the following two events occur to create a sea breeze? select all that apply. warm air rises on the ocean and moves toward the land to cool warm air rises on land and moves toward the ocean to cool cool air moves from the ocean to be warmed by the land cool air moves from the land to be warmed by the ocean

Answers: 3

Answer

Chemistry, 22.06.2019 15:30

The reactions of photosynthesis occur in the of plant cell? a.mitochondria. b. lysosomes. c. chloroplasts. d. chlorophyll

Answers: 1

Answer

You know the right answer?

A sample of gas has a mass of 64 g. Its volume is 37.6 L at a temperature of 275k and a pressure of...

Questions