Question

THERE ARE TWO QUESTIONS PLZ ANSWER FAST N CORRECTLY I WILL MAKE YOU BRAINLIST. ​

Answer 1

Explanation:

2)

Calculate formula unit mass of :

(i) ZnSO4

→ 65 + 32 + 16×4

→ 65 + 32 + 64

→ 161 u

(ii) HNO3

→ 1 + 14 + 16×3

→ 1 + 14 + 48

→ 63 u

(iii) PCl5

→ 31 + 35.5×5

→ 31 + 177.5

→ 208.5 u

(iv) SO3

→ 32 + 16×3

→ 32 + 48

→ 80 u

3)

Calculate the molecular mass of the following :

(i) C2H5COOH

→ 12×2 + 1×5 + 12 + 16 + 16 + 1

→ 24 + 5 + 12 + 33

→ 74 u

(ii) (NH4)3PO4

→ (14 + 1×4)3 + 31 + 16×4

→ (14+4)3 + 31 + 64

→ 54 + 31 + 64

→ 149 u

(iii) KMnO4

→ 39 + 55 + 16×4

→ 39 + 55 + 64

→ 158 u

Difference between Molecular mass and formula unit mass :

1. Formula unit mass is the mass of empirical formula of that compound.
2. Molecular mass is the mass of a molecule of a particular substance.