Mole Conversions & % Composition

What is the % composition by mass of sodium in NaCl?

• 39%
• 61%
• 35%
• 65%

Tags

NGSS.HS-PS1-7

What is the percentage of hydroxide ions in Ca(OH)₂?

• 45.9%

• 75%

• 66.6%

• 90.1%

The % composition of aluminum in aluminum sulfate, Al₂(SO₄)₃, is:

• 12.93%

• 45.70%

• 7.89%

• 35.94%

• 15.77%

The % composition of H in methane (CH₄) is:

• 75%

• 92%

• 25%

• 4%

• 6%

1 mole of Ca and 1 mole of Na have the same number of atoms.

• True

• False

The unit for Molar mass is ________.

• grams
• grams/mole
• mole
• moles/gram

Which of the following dimensional analysis setups will correctly convert 4.00 x 10²³ atoms of cobalt to moles of cobalt? How many moles of cobalt are there?

• setup B : 0.6644mol Co
• setup A: 2.41x10⁴⁷mol Co
• setup A : 0.664mol Co
• setup B: 2.41x10⁴⁷mol Co

Which of the following dimensional analysis setups will correctly convert 27.76 g of Li to atoms of Li?

• A
• B
• C
• D

Tags

NGSS.HS-PS1-7

How many grams are there in 25 moles of water?

• 25 g

• 450 g

• 18 g

• 50 g

Which of the following dimensional analysis setups will correctly convert 2.50 moles of sodium to grams of sodium?

• A
• B
• C
• D