Question

Calculate the molecular mass of the following;
a. Ca(OH)2 b. HNO3 c. CaCO3 [ At mass Ca-(40), O (16), H(1), N (14), C (12) ].​

Answer 1

Answer:

a) 72

b) 62

c) 100

Explanation:

MARK ME THE BLAINLIEST

Answer 2

Answer:

(i) 74

(ii) 63

(iii)

Explanation:

(i)The Molecular mass of Ca(OH)  

2

​

=1(Atomic mass of Ca)+2(Atomic mass of O) +2(Atomic mass of H)

                                              =40+2(16)+2(1)

                                              =40+32+2

                                              =74

(ii) The molar mass of the chemical substance is equal to the sum of the atomic mass of the individual atoms.

Given

1) The Atomic mass of H = 1u

2) The Atomic mass of N = 14 u

3) The Atomic mass of O = 16u

The molar mass of HNO3 is

(1 × 1) +(1 × 14) + (16×3) = 63 u.

(iii) Chemical formula of calcium carbonate ⟶CaCO3

Mass of Calcium⟶40

Mass of Carbon⟶12

Mass of Oxygen⟶16

Multiply mass of each element by the number of atoms of that element

Add all the masses obtained after multiplication.⟶CaCO3

=1×40+1×12+3×16

=40+12+48

=100.