Question

What is it’s molecular formula for C5H4 if it’s molar mass is 128.17g/mol

Answer 1

Answer :

QUESTION ①)

✔ C5H4 has a molecular molar mass of :

M(C5H4) = 5 x M(C) + 4 x M(H)

• M(C5H4) = 5 x 12 + 4 x 1
• M(C5H4) = 60 + 4
• M(C5H4) = 64 g/mol

✔ The molecular mass of C5H4 is therefore 64 g/mol.

• But, 128/64 = 2

This is double the molar mass of C5H4, this molecule has the formula 2C5H4.