Answer chemistry homework ?

Question

What volume of Ar at 45°C and 1.5 atm contains the same number of particles as 0.655 L of H2 at 15°C and 3.00 atm? Write the answer in the box with the correct number of significant figures. Use Liters as unit of measure of the volume. Don't write the units in the box.

Roger the Mole · Answer

If the two gases have the same number of particles, they also have the same number of moles:
(0.655 L) x (45 + 273) K / (15 + 273) K x (3.00 atm / 1.5 atm) = 1.45 L Ar

[The other answer by "?": R is unnecessary in this problem.]

? · Answer

PV=nRT <<<memorize!!
n is moles, R is gas constant (use correct one!), T is temp in K (C+273.15)
sub in your numbers and solve

SI Units R values:
8.31446261815324 J⋅K⁻¹⋅mol⁻¹
8.31446261815324 m³⋅Pa⋅K⁻¹⋅mol⁻¹
8.31446261815324 kg⋅m²·K⁻¹⋅mol⁻¹s⁻²
8.31446261815324×103 L⋅Pa⋅K⁻¹⋅mol⁻¹
8.31446261815324×10−2 L⋅bar⋅K⁻¹⋅mol⁻¹
0.082057 L atm mol⁻¹K⁻¹
62.36L·torr/mol·K = L·mmHg/mol·K

US Customary Units R values:
0.730240507295273 atm⋅ft³⋅lbmol⁻¹°R⁻¹
10.731557089016 psi⋅ft³⋅lbmol⁻¹°R⁻¹
1.985875279009 BTU⋅lbmol⁻¹°R⁻¹

Answer chemistry homework ?

2 Answers