Multiple Choice
How many hydrogen atoms are present in 35.0 grams of hydrogen gas (H_2)?
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Table of contents
- 1. Intro to General Chemistry3h 48m
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2. Atoms & Elements
Mole Concept
Struggling with General Chemistry?
Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple 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
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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