Advertisements
Advertisements
प्रश्न
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
उत्तर
| 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
संबंधित प्रश्न
Calculate the molecular mass of CO2.
What is the significance of the formula H2O ?
Calculate the molecular masses of the following compounds :
Hydrogen sulphide, H2S
Convert 12 g of oxygen gas into moles.
Calculate the molar masses of the following substances. Write the results with proper units.
- Ozone molecule, O3
- Ethanoic acid, CH3COOH
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 relative molecular masses of the following
CHCI3
[At mass : C = 12, H = 1, O = 16, Ci = 35.5, N = 14, Cu = 63.5, S = 32, K = 39, Pt = 195, Ca = 40, P = 31, Mg = 24]
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 reacts with dilute hydrochloric acid as given below:
\[\ce{CaCO3 + 2HCl -> CaCl2 + H2O + CO2}\]
- What is the mass of 5 moles of calcium carbonate? (Relative molecular mass of calcium carbonate is 100)
- How many moles of HCl will react with 5 moles of calcium carbonate?
- What is the volume of carbon dioxide liberated at S.T.P. at the same time?
A gas occupied 360 cm3 at 87°C and 380 mm Hg pressure. If the mass of gas is 0.546 g, find its relative molecular mass.
