객관식
A pure silver ring contains 2.80 × 10^{22} silver atoms. How many moles of silver atoms does it contain?
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2. Atoms & Elements
Mole Concept
Multiple Choice
How many moles are present in 15 grams of lithium (Li)? (Atomic mass of Li = 6.94 g/mol)
A
1.50 moles
B
2.16 moles
C
0.46 moles
D
0.93 moles
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검증된 단계별 안내1
Identify the given information: mass of lithium (Li) is 15 grams, and the atomic mass of lithium is 6.94 g/mol.
Recall the formula to calculate moles from mass: \(\text{moles} = \frac{\text{mass (g)}}{\text{molar mass (g/mol)}}\).
Substitute the given values into the formula: \(\text{moles} = \frac{15}{6.94}\).
Perform the division to find the number of moles (do not calculate the final value here, just set up the expression).
Interpret the result as the amount of substance in moles present in 15 grams of lithium.
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