Question

1.What do the following formulae stand for?

i. 2O

ii. O2

iii. O3

iv. H2O

2. State the number of atoms in the following

i. HNO3

ii. CaSO4

iii. CO3

3. How many atoms are there in 35.5 g of chlorine?

4. Calculate the number of particles in each of the following:

a) 4 moles of magnesium

b) 3 moles of calcium

5.Calculate the molar mass of

a) NH3

b) Mg(NO3)2













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Answer 1

Answer:

1. i) Oxide

ii) Oxygen

iii) Monoxide

iv) Water

2.i) H -1

N -1

O -3

ii)Ca -1

S -1

O -4

iii)C -1

O -3

3. 6.02 × 10^23 atoms C.

4. i) 24.31 g

ii) 6.0022 g

5. i) 17.031 g/mol

ii) 148.3 g/mol