Advertisements
Advertisements
Question
Calculate the molecular mass of CO2.
Advertisements
Solution
Molecular mass of CO2 = Atomic mass of C + 2 × Atomic mass of O
= 12 + 2 × 16
= (12 + 32) u
= 44 u
RELATED QUESTIONS
Calculate the molecular masses of the following :
- Hydrogen, H2
(Atomic masses : H = 1 u ; O = 16 u ; Cl = 35.5 u ; N = 14 u ; C = 12 u)
How many moles are there in 34.5 g of sodium ? (Atomic mass of Na = 23 u)
Define gram molecular mass of a substance. How much is the gram molecular mass of oxygen ?
If sulphur exists as S8 molecules, calculate the number of moles in 100 g of sulphur. (S = 32 u)
A gas cylinder of capacity of 20 dm3 is filled with gas X the mass of which is 10 g. When the same cylinder is filled with hydrogen gas at the same temperature and pressure the mass of the hydrogen is 2 g, hence the relative molecular mass of the gas is ______.
From the equation
\[\ce{3Cu + 8HNO3 -> 3Cu(NO3)2 + 4H2O + 2NO}\]
(Atomic mass Cu = 64, H = 1, N = 14,O = 16)
Calculate the mass of copper needed to react with 63g of HNO3.
Urea [CO(NH2)2] is an important nitrogenous fertilizer. Urea is sold in 50 kg sacks. What mass of nitrogen is in one sack of urea?
Calcium carbonate is decomposed on heating in the following reaction
CaCO3 → CaO + CO2
Calculate the gram molecular mass of calcium carbonate involved in this reaction.
What is the SI prefix for each of the following multiples and submultiples of a unit?
- 103
- 10–1
- 10–2
- 10–6
- 10–9
- 10–12
Calcium carbonate react with dilute hydrochloric acid as given below:
\[\ce{CaCO3 + 2HCl -> CaCl2 + H2O + CO2}\]
What is the volume of carbon dioxide liberated at S.T.P. at the same time?
