How many atoms are present in the following? [5 MARKS]
1. $H_{2} S$
2. $P O_{4}^{3 -}$ ion
3. $C O$
4. $C_{6} H_{12} O_{6}$
5. $S O_{4}$

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Solution

Each point: 1 Mark

1. In an $H_{2} S$ molecule, three atoms are present; two of hydrogen and one of sulphur

2. In a $P O_{4}^{3 -}$ ion, five atoms are present; one of phosphorus and four of oxygen

3. In a $C O$ molecule, two atoms are present; one carbon atom and one oxygen atom

4. $C_{6} H_{12} O_{6}$ molecule, twenty four atoms are present; six carbon atom; there is twelve hydrogen atom and six oxygen atom

5. $S O_{4}$ molecule, five atoms are present; one sulphur atom; four oxygen atom

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(ii)

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How many atoms are present in the following? [5 MARKS] 1. H2S 2. PO3−4 ion 3. CO 4. C6H12O6 5. SO4

How many atoms are present in the following? [5 MARKS]
1. $H_{2} S$
2. $P O_{4}^{3 -}$ ion
3. $C O$
4. $C_{6} H_{12} O_{6}$
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