Question

Compare the masses of a one-liter sample of hydrogen and a one-liter sample of helium gas, each at 25°C and 5.0 atm pressure.
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A) the helium gas has twice the mass of the hydrogen gas
B) the helium gas has four times the mass of the hydrogen gas
C) the hydrogen gas has twice the mass of the helium gas
D) the hydrogen gas has four times the mass of the helium gas
E) the mass of the hydrogen gas equals the mass of the helium gas

Answer 1

• Both gases are at NTP

• At NTP 22.4L gas is equal to 1mol.
• 1L is equal to 1/22.4=0.04mol

Now let's find masses

$\\ \tt\hookrightarrow Mass=No\:of\:moles\times Molar\:mass$

$\\ \tt\hookrightarrow Mass_{(H)}=0.04(1)=0.04g$

$\\ \tt\hookrightarrow Mass_{(He)}=0.04(4)=0.16g$

Ratio:-

• 0.16/0.04=4:1

The helium gas has 4times the mass of hydrogen gas.

Answer 2

Answer:

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