Advertisements
Advertisements
प्रश्न
A compound made up of two elements X and Y has an empirical formula X2Y. if the atomic weight of X is 10 and that Y is 5 and the compound has a vapour density (V.D.) 25, find its molecular formula.
उत्तर
Empirical formula = X2Y
Atomic weight (X) = 10
Atomic weight (Y) = 5
Empirical formula weight = (2 × 10) + 5 = 25
n = `"Molecular weight"/"Empirical formula weight"`
= `[2 xx "V.D."]/"Empirical formula weight"`
= `[ 2 xx 25]/25`
= 2
∴ Molecular formula = X2Y × 2
= X4Y2
APPEARS IN
संबंधित प्रश्न
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].
An organic compound with vapour density = 94 contains C = 12.67%, H = 2.13% and Br = 85.11%. Find the molecule formula.
[Atomic mass: C = 12, H = 1, Br = 80]
If the empirical formula of two compounds is CH and their vapour densities are 13 to 39 respectively, find their molecular formula.
A gaseous hydrocarbon contains 82.76% of carbon. Given that its vapour density is 29, find its molecular formula.
Barium chloride crystals contain 14.8% water of crystallization. Find the number of molecules of water of crystallization per molecule.
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.
A hydrate of calcium sulphate CaSO4.xH2O contains 21% water of crystallization. Find the value of x.
112 cm3 of a gaseous fluoride of phosphorus has a mass of 0.63 g. Calculate the relative molecular mass of the fluoride. If the molecule of the fluoride contains only one atom of phosphorus, then determine the formula of the phosphorus fluoride. [ F = 19, P = 31].
Arrange the following according to the instruction given in bracket:
C2H2, C3H6, CH4, C2H4 (In the increasing order of the molecular weight)
On analysis, a substance was found to contain:
C = 54.54%, H = 9.09%, O = 36.36%
The vapour density of the substance is 44, calculate its molecular formula.
