Question

The ratio between the number of molecules in 2g of hydrogen and 32g of oxygen is? [given that H=1 O=16]

• A. (A)1:2
• B. (B)1:0.01
• C. (C)1:1
• D. (D)0.01:1

Answer 1

The correct option is C

(C)1:1

Explanation of correct answer

(C ) 1:1

1g of H=16g of O

2g of H=32g of O

Moles in 2g of hydrogen=given mass/molar mass

=2g/2*1g=1mol

Moles in 32g of oxygen=given mass/molar mass

=32g/2*16g=1mol

Hence the ratio of H:O= 1mol/1mol

=1:1

Explanation of incorrect answer

a)1:2

If 2 g hydrogen and 64 g oxygen is taken, then only get the answer 1:2

b)1:0.01

If 2 g hydrogen and 0.32 g oxygen is taken, then only get the answer 1:0.01

d) 0.01:1

If 0.02g hydrogen and 32 g oxygen is taken, then only get the answer 1:0.01