Advertisements
Advertisements
Question
Write the formulae for the following and calculate the molecular mass for each one of them.
- Caustic potash
- Baking powder
- Limestone
- Caustic soda
- Ethanol
- Common salt
Advertisements
Solution
| S.No. | Compound | Formula | Molecular Mass |
| a. |
Caustic potash |
KOH | 39 + 16 + 1 = 56u |
| b. | Baking powder | NaHCO3 | 23 + 1 + 12 + 3 × 16 = 84u |
| c. | Limestone | CaCO3 | 40 + 12 + 3 × 16 = 100u |
| d. | Caustic soda | NaOH | 23 + 16 + 1 = 40u |
| e. | Ethanol | C2H3OH | 2 × 12 + 5 × 1 + 16 + 1 = 46u |
| f. | Common salt | NaCl | 23 + 35.5 = 58.5u |
APPEARS IN
RELATED QUESTIONS
Calculate the molecular mass of CH3OH.
Calculate the molecular mass of hydrogen bromide (HBr). (Atomic masses : H = 1 u ; Br = 80 u)
Calculate the molecular masses of the following :
Carbon dioxide, CO2
(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)
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 ______.
Calculate the molecular mass of the following:
(NH4)2CO3
Given atomic mass of Cu = 63·5, H = 1, O= 16, C = 12, N = 14, Mg = 24, S = 32
Calculate the molecular mass of the following:
Mg3N2
Given atomic mass of Cu = 63·5, H = 1, O = 16, C = 12, N = 14, Mg = 24, S = 32
Calculate the weight/mass of the molecule of oxygen.
The gram molecular mass of oxygen molecule is ______.
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
