Counting atoms, Molar Mass, and Percent Composition

The number of Na's in Na₂CO₃

• 1
• 2
• 3
• 6

Tags

NGSS.MS-PS1-1

How many Nitrogen atoms are in (NH₄)₂CrO₄?

• 1

• 2

• 8

• 16

Tags

NGSS.MS-PS1-1

How many Oxygen atoms are in Al₂(SO₄)₃?

• 4

• 12

• 7

• 24

Tags

NGSS.MS-PS1-1

What is the Molar Mass of Sodium Bicarbonate?

• 87g

• 84g

• 84.5g

• 84.2g

Tags

NGSS.HS-PS1-7

What is the Molar Mass of Ca₃(PO₄)₂?

• 310g

• 310.18g

• 309g

• 308g

Tags

NGSS.HS-PS1-7

What is the molar mass of CO₂?

• 12
• 16
• 32
• 44

What is the percent by mass of magnesium in MgO?

• 20%
• 40%
• 50%
• 60%

Find the percent composition of Cu₂S?

• %Cu= 67.987 %S= 32.013
• %Cu= 79.854   %S= 20.145
• %Cu= 35.946   %S= 64.054

What is the percent composition of aluminum phosphate?

• Al = 25%
  P = 25%
  O = 75%
• Al = 22.1%
  P = 35.8%
  O = 42.1%
• Al = 14.3%
  P = 25.4%
  O = 60.3%
• Al = 22.1%
  P = 25.4%
  O = 52.5%

What is the volume of a mole of water at standard temperature and pressure?

• 6.022 x 10²³ L

• 18 L

• 22.4 L