Multiple Choice
How many hydrogen atoms are present in 35.0 grams of hydrogen gas (H_2)?
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2. Atoms & Elements
Mole Concept
Multiple Choice
How many moles are present in 17.5 grams of sodium (Na)? (Atomic mass of Na = 23.0 g/mol)
A
0.761 mol
B
0.239 mol
C
1.31 mol
D
2.30 mol
0 Comments
Verified step by step guidance1
Identify the given information: mass of sodium (Na) is 17.5 grams, and the atomic mass of sodium is 23.0 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: \(\text{moles} = \frac{17.5}{23.0}\).
Perform the division to find the number of moles of sodium present.
Interpret the result as the amount of substance in moles corresponding to the given mass of sodium.
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