Question: What is the number of moles in 10 grams of hydrogen gas (H2)? (2019)
Options:
5
0.5
1
2
Correct Answer: 0.5
Solution:
Molar mass of H2 = 2 g/mol. Number of moles = 10g/2g/mol = 5 moles.
What is the number of moles in 10 grams of hydrogen gas (H2)? (2019)
Practice Questions
Q1
What is the number of moles in 10 grams of hydrogen gas (H2)? (2019)
5
0.5
1
2
Questions & Step-by-Step Solutions
What is the number of moles in 10 grams of hydrogen gas (H2)? (2019)
Step 1: Identify the chemical formula of hydrogen gas, which is H2.
Step 2: Calculate the molar mass of H2. Since hydrogen (H) has a molar mass of about 1 g/mol, and there are 2 hydrogen atoms in H2, the molar mass of H2 is 1 g/mol * 2 = 2 g/mol.
Step 3: Use the formula for the number of moles, which is: Number of moles = mass (in grams) / molar mass (in g/mol).
Step 4: Plug in the values: Number of moles = 10 grams / 2 g/mol.
Step 5: Calculate the number of moles: 10 grams / 2 g/mol = 5 moles.
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