객관식
How many iodine atoms are present in 4 molecules of carbon tetraiodide (CI_4)?
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2. Atoms & Elements
Calculating Molar Mass
객관식
What is the mass of 0.25 mole of sodium (Na)?
A
5.75 g
B
2.30 g
C
11.5 g
D
10.0 g
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검증된 단계별 안내1
Identify the given quantity: 0.25 mole of sodium (Na).
Recall that the molar mass of sodium (Na) is approximately 23.0 g/mol. This value represents the mass of one mole of sodium atoms.
Use the formula to calculate mass from moles: \(\text{mass} = \text{moles} \times \text{molar mass}\).
Substitute the known values into the formula: \(\text{mass} = 0.25 \text{ mole} \times 23.0 \text{ g/mole}\).
Perform the multiplication to find the mass of 0.25 mole of sodium.
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