Chemistry - Percent Composition

What is the percent by mass of chlorine in NaCl?

• 39%
• 61%
• 35%
• 65%

What percent of Zn₃(PO₄)₂ is zinc?

• 33.15%

• 16.04%

• 50.80%

• 19.68%

Tags

NGSS.HS-PS1-7

What is the percent composition of a compound that contains 40.8 g carbon and 54.4 g oxygen?

• 42.9 %; 57.1% oxygen

• 52.9 %; 57.1% oxygen

• 42.9 %; 45.23% oxygen

• 55.9 %; 99.1% oxygen

Tags

NGSS.MS-PS1-1

Find the percent composition of CaCl₂?

• Ca: 36.11%; Cl: 63.88%

• Ca: 53.12%; Cl: 100%

• Ca: 36.11%; Cl: 83.56%

• Ca: 46.11%; Cl: 63.88%

What is the percent by mass of sodium in NaCl?

• 39%
• 61%
• 35%
• 65%

What is the percent composition of S in the formula (NH₄)₂S ?

• 12.05%
• 19.30%
• 47.11%
• 56.18%

If 45.0 g of Mg react with 19.5 g of oxygen, what is the % ofmagnesium in the resulting compound?

• 69.8%
• 30.2%
• 43.3%
• 12.9%

Tags

NGSS.HS-PS1-7