How many atoms are present in the following? [5 MARKS]
1. $H_{2} O_{2}$
2. $H_{3} P O_{4}$
3. $C O_{3}^{2 -}$
4. $C_{12} H_{22} O_{11}$
5. $H_{2} S O_{4}$

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Solution

Each point: 1 Mark

1. In an $H_{2} O_{2}$ molecule, four atoms are present; two of hydrogen and two of oxygen.

2. In a $H_{3} P O_{4}$ ion, eight atoms are present; three of hydrogen, one of phosphorus and four of oxygen.

3. In a $C O_{3}^{2 -}$ molecule, four atoms are present; one carbon atom and three oxygen atoms.

4. $C_{12} H_{22} O_{11}$ molecule, forty five atoms are present; twelve carbon atoms; twenty two hydrogen atoms and eleven oxygen atoms.

5. $H_{2} S O_{4}$ molecule, seven atoms are present; two hydrogen atoms, one sulphur atom and four oxygen atoms.

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Similar questions

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. $S O_{4}$

H_{2} S O_{4}

How many bonds are present in ${C O_{3}}^{2 -}$ ion?

P_{4} O_{10}

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