Percentage Composition Lab

What is the percent by mass of magnesium in MgO?

• 20%
• 40%
• 50%
• 60%

What is the percent composition of sulfur in the compound MgSO₄?

• 20%

• 27%

• 46%

• 53%

What is the percent composition by mass of magnesium in the compound MgSO₄?

• 20%

• 27%

• 46%

• 53%

What is the percent by mass of oxygen in MgO?

• 20%
• 40%
• 50%
• 60%

Tags

NGSS.HS-PS1-7

Find the percent composition of Cu in CuBr₂ .

• 28.44%

• 32.85%

• 17.78%

• 68.10%

What is the percent composition of Na in NaOH?

• 42.5%

• 57.5%

• 40%

• 2.5%

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

• 12.05%

• 19.30%

• 47.14%

• 56.18%

What is the percent composition on Oxygen in NO₂? (rounded)

• 40%
• 50%
• 60%
• 70%

Which of the following is NOT needed to calculate percent composition?

• Mass of specific element
• Molar Mass
• Avogadro's Number
• Division

What is the molar mass of CO₂?

• 44 g/mol

• 56 g/mol

• 59 g/mol

• 117 g/mol