Question

please answer Question 15 with proper explanation

Answer 1

14 g of elements X combine with 16g of oxygen .

we know,
atomic weight of oxygen = 16 g/mol

Let if atomic weight of X is 7 g/mol
then ,

mole of X = given weight /atomic weight = 14/7 = 2 mole

mole of Oxygen = 16/16 = 1 mole

hence, 2 mole of element X combine with 1 mole of oxygen .

2 mole of X combine 1 mole of oxygen
e.g

X : O
2 : 1

so, X2O

hence, if atomic weight of X is 7 g/ mol then formula of combination is X2O
so, option ( C) is correct .

Answer 2

14 g of elements X combine with 16g of oxygen.

we know,

atomic weight of oxygen = 16 g/mol

Let if atomic weight of X is 7 g/mol then,

mole of X = given weight /atomic weight = 14/7 = 2 mole

mole of Oxygen = 16/16 = 1 mole =

hence, 2 mole of element X combine with 1 mole of oxygen.

2 mole of X combine 1 mole of oxygen e.g

X:O 2:1

so, X20

hence, if atomic weight of X is 7 g/mol the formula of combination is X20 so, option (C) is correct.