Answer:
Molecular formula = B₃N₃H
₆
Explanation:
Given data:
Percentage of B = 40.3%
Percentage of N = 52.2%
Percentage of H = 7.5%
Molar mass = 80g/mol
Molecular formula = ?
Solution:
Number of gram atoms of B = 40.3/ 10.8= 3.73
Number of gram atoms of N = 52.2/ 14 = 3.73
Number of gram atoms of H = 7.5 / 1 = 7.5
Atomic ratio:
B : N : H
3.73/3.73 : 3.73/3.73 : 7.5/3.73
1 : 1 : 2
B : N : H = 1 : 1 : 2
Empirical formula is BNH
₂
Molecular formula:
Molecular formula = n (empirical formula)
n = molar mass of compound / empirical formula mass
n = 80 g/mol/ 26.8 g/mol
n = 3
Molecular formula = n (empirical formula)
Molecular formula = 3 (BNH
₂)
Molecular formula = B₃N₃H
₆
