객관식
What is the mass (in grams) of 1.27 mol of water (H_2O)?
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2. Atoms & Elements
Calculating Molar Mass
객관식
How many carbon atoms are present in 15.0 grams of graphite (pure carbon)? (Atomic mass of carbon = 12.01 g/mol)
A
1.25 × 10^{24} atoms
B
5.02 × 10^{22} atoms
C
3.01 × 10^{23} atoms
D
7.52 × 10^{23} atoms
검증된 단계별 안내1
Identify the given information: mass of graphite = 15.0 g, atomic mass of carbon = 12.01 g/mol.
Calculate the number of moles of carbon atoms in 15.0 g of graphite using the formula: \(\text{moles} = \frac{\text{mass}}{\text{molar mass}} = \frac{15.0}{12.01}\).
Recall that 1 mole of any substance contains Avogadro's number of particles, which is \(6.022 \times 10^{23}\) atoms/mol for carbon atoms.
Calculate the total number of carbon atoms by multiplying the moles of carbon by Avogadro's number: \(\text{number of atoms} = \text{moles} \times 6.022 \times 10^{23}\).
Express the final answer in scientific notation to compare with the given options.
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