Multiple Choice
0.0076 moles of an ideal gas is at 24°C. If it is a sealed container with a volume of 86 cm3, what is the pressure of the gas?
20. Heat and Temperature
Moles and Avogadro's Number
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If the molar mass of hydrogen is 1.008 g/mol, what is the mass (in grams) of 2 hydrogen atoms?
A
0.5004
B
3.35 × 10-24
C
2.016
D
1.69 × 10-24
Verified step by step guidance1
Identify the number of hydrogen atoms, which is 2 in this case.
Use Avogadro's number (N_A = 6.022 × 10^23 mol^-1) to convert the number of atoms to moles. The formula is n = N / N_A, where N is the number of particles.
Calculate the moles of hydrogen atoms using the formula: n = 2 / (6.022 × 10^23).
Use the molar mass of hydrogen (1.008 g/mol) to find the mass. The formula is m = n × M, where M is the molar mass.
Calculate the mass of 2 hydrogen atoms using the moles obtained in the previous step and the molar mass: m = (2 / (6.022 × 10^23)) × 1.008.
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