Advertisements
Advertisements
Question
Calculate the relative molecular mass of Chloroform.
(use K = 39, Cl = 35.5, O = 16, C = 12, H = 1, Na = 23, N = 14, S= 32)
Solution
The relative molecular mass of Chloroform (CH3Cl) is:
[atomic mass of 1 C atom + Atomic mass of 3 H atom + atomic mass of 1 Cl]
12 + 3 x 1 + 35 .5 = 50 .5
APPEARS IN
RELATED QUESTIONS
Prove the Following :
2 X V.D. = Molecular mass.
Find the total percentage of oxygen in magnesium nitrate crystal Mg(NO3)2.6H2O.
[H = 1, N = 14, O = 16, Mg = 24]
If the relative molecular mass of A is 90, what is the molecular formula of A?
Concentrated nitric acid oxidizes phosphorous to phosphoric acid according to the following equation :
P + 5HNO3 → H3PO4 + H2O + 5NO2
What mass of phosphoric acid can be prepared from 6 .2 g of phosphorous?
When excess lead nitrate solution was added to a solution of sodium sulphate, 15.1g of lead sulphate was precipitated. What mass of sodium sulphate was present in the original solution?
Na2SO4 + Pb(NO3)2 → PbSO4 + 2NaNO3
(H = 1, C = 12, O = 16, Na = 23, S = 32, Pb = 207)
Chlorine, nitrogen, ammonia and sulphur dioxide gases are collected under the same conditions of temperature and pressure.
Copy the following table which gives the volumes of the gases collected, and the number of molecules (X) in 20L of nitrogen.You are to complete the table by giving the number of molecules in th e other gases, in terms of X.
Gas | Volume(litres) | Number of molecules |
Chlorine | 10 | |
Nitrogen | 20 | X |
Ammonia | 20 | |
Sulphur dioxide | 5 |
A flask contains 3.2g of sulphur dioxide. Calculate the following: The number of molecules of sulphur dioxide present in the flask.
Calculate the relative molecular mass of:
CuSO4. 5H2O
Calculate the relative molecular mass of:
CH3COONa
Ammonia burns in oxygen and the combustion, in the presence of a catalyst, may be represented by;
\[\ce{2NH3 + 2 1/2O2 -> 2NO + 3H2O}\] [H = 1, N = 14, O = 16]
What mass of steam is produced when 1.5 g of nitrogen monoxide is formed?