molecular formula of a compound is BnH11.the relative molecular mass is 66.find n

Answer 1

The total mass of B + H must equal 66. From the periodic table,...

atomic mass of B = 10.8

atomic mass of H = 1.0

H₁₁ = 11

B = 66 - 11 = 55 mass of B_n

n = 55/10.8 = 5

molecular formula => B₅H₁₁