Stoichiometry and the Mole quiz (Singapore N(A)-Level Science Chemistry, SEAB 5107) quiz

MgCl

Mg_2Cl

MgCl_2

Mg_2Cl_2

The small subscripts inside a formula

The state symbols only

The symbols of the elements

The numbers (coefficients) in front of the formulae

$2\text{H}_2 + \text{O}_2 \rightarrow 2\text{H}_2\text{O}$

$\text{H}_2 + \text{O}_2 \rightarrow \text{H}_2\text{O}$

$\text{H}_2 + \text{O}_2 \rightarrow \text{H}_2\text{O}_2$

$\text{H} + \text{O} \rightarrow \text{HO}$

Exactly one particle

The Avogadro number of particles

One gram of the substance

A different number for each substance

moles = mass times relative formula mass

moles = relative formula mass divided by mass

moles = mass divided by relative formula mass

moles = mass plus relative formula mass

17

34

16

18

2

1

18

0.5

28

44

32

16

Multiply the masses together

Use the mole ratio

Convert the known mass into moles

Convert moles back to mass

The subscripts inside the formulae

The order the substances are written

The state symbols

The coefficients in front of the formulae

2 moles

1 mole

4 moles

0.5 mole

40 g

20 g

80 g

10 g

The mass of reactant used divided by 100

The number of moles of reactant

The actual mass of product as a percentage of the theoretical mass

The relative formula mass of the product