How many moles of gas are present in a 44.8 L sample of an ideal gas at STP (0 degrees C and 1.0 atm)?
Answer and explanation
Correct answer: B. 2.0 moles
- Step 1: At STP, one mole of any ideal gas occupies a standard molar volume of 22.4 L.
- Step 2: Number of moles n = V / V_molar = 44.8 L / 22.4 L/mol = 2.0 mol.
Answer
2.0 moles.
Why not the others: '1.0 mole' corresponds to 22.4 L; '0.50 moles' corresponds to 11.2 L; '4.0 moles' multiplies by 2.
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