Stoichiometry IGCSE

Front

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? Options: NO, NO₂, NO₄, N₂O₄

Back

N₂O₄

Front

Which statements are correct? Options: 1 and 2, 1 and 4, 2 and 3, 3 and 4

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1 and 2

Front

What is the mass of carbon present in 100 g of calcium carbonate (CaCO₃) with a relative formula mass (M_r) of 100?

Back

12 g

Front

What is the relative formula mass of magnesium nitrate (Mg(NO₃)₂)? Options: 86, 134, 148, 172

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148

Front

C₃H₈ + xO₂ → 3CO₂ + yH₂O. Which values of x and y balance the equation? Options: x = 5, y = 4; x = 7, y = 4; x = 10, y = 8; x = 13, y = 8.

Back

x = 5, y = 4

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Back

D

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Back

C

Front

CaCO₃ --> CaO + CO₂

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B

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C

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C