Stoichiometry IGCSE

An oxide of nitrogen has the following composition by mass: N, 30.4%; O, 69.6%.

It has a relative molecular mass of 92.

What is the molecular formula of the oxide of nitrogen?

• NO

• NO₂

• NO₄

• N₂O₄

Tags

NGSS.HS-PS1-1

Which statements are correct?

• 1 and 2

• 1 and 4

• 2 and 3

• 3 and 4

Tags

NGSS.HS-PS1-7

The relative formula mass, M_r, of calcium carbonate, CaCO₃, is 100.

What is the mass of carbon present in 100 g of calcium carbonate?

• 12 g

• 40 g

• 36 g

• 60 g

The compound magnesium nitrate has the formula Mg(NO₃)₂.

What is the relative formula mass of magnesium nitrate?

• 86

• 134

• 148

• 172

Propane burns in oxygen.

C₃H₈ + xO₂ → 3CO₂ + yH₂O

Which values of x and y balance the equation?

• x = 5, y = 4

• x = 7, y = 4

• x = 10, y = 8

• x = 13, y = 8

Tags

NGSS.HS-PS1-7

• A

• B

• C

• D

Tags

NGSS.HS-PS1-7

• A

• B

• C

• D

CaCO₃ --> CaO + CO₂

• A

• B

• C

• D

Tags

NGSS.HS-PS1-7

• A

• B

• C

• D

Tags

NGSS.HS-PS1-7

• A

• B

• C

• D

Tags

NGSS.HS-PS1-7