Stoichiometry IGCSE

Stoichiometry IGCSE

Assessment

Flashcard

Chemistry

9th - 11th Grade

Hard

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16 questions

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1.

FLASHCARD QUESTION

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

2.

FLASHCARD QUESTION

Front

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

Back

1 and 2

3.

FLASHCARD QUESTION

Front

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

Back

12 g

4.

FLASHCARD QUESTION

Front

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

Back

148

5.

FLASHCARD QUESTION

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

6.

FLASHCARD QUESTION

Front

Back

D

7.

FLASHCARD QUESTION

Front

Back

C

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