Advertisements
Advertisements
Question
A compound X consists of 4.8% carbon and 95.2% bromine by mass. If the vapour density of the compound is 252, what is the molecular formula of the compound?
Solution
Empirical formula mass = 12 + 3 × 80 = 252 g
Molecular formula mass = 2 × 252(V.D) = 504 g
n = `"Molecular mass"/"Empirical formula mass"`
= `504/252`
= 2
∴ Molecular formula = 2 × C1Br3
= C2Br6
APPEARS IN
RELATED QUESTIONS
A gaseous compound of nitrogen and hydrogen contains 12.5% hydrogen by mass. Find the molecular formula of the compound if its relative molecular mass is 37.
[N = 14, H = 1].
Calculate the mass of iron in 10 kg of iron ore which contains 80% of pure ferric oxide.
If the empirical formula of two compounds is CH and their vapour densities are 13 to 39 respectively, find their molecular formula.
A hydrocarbon contains 4.8g of carbon per gram of hydrogen. Calculate Find molecular formula, if its vapour density is 29.
Barium chloride crystals contain 14.8% water of crystallization. Find the number of molecules of water of crystallization per molecule.
A compound with empirical formula AB has vapour density 3 times its empirical formula weight. Find the molecular formula.
A compound has O = 61.32%, S = 11.15%, H = 4.88% and Zn = 22.65%. The relative molecular mass of the compound is 287 amu. Find the molecular formula of the compound, assuming that all the hydrogen is present as a water of crystallization.
Find the molecular formula of a hydrocarbon having vapour density 15, which contains 20% of Hydrogen.
A metal M forms a volatile chloride containing 65.5% chlorine. If the density of the chloride relative to hydrogen is 162.5, find the molecular formula of the chloride (M = 56).
An organic compound contains H = 4.07%, Cl = 71.65% chlorine and remaining carbon. Its molar mass = 98.96. Find its molecular formula.
