Advertisements
Advertisements
Question
Write the name of the following compound and deduce its molecular mass.
NaHCO3
Advertisements
Solution
NaHCO3 - Sodium bicarbonate
| Molecule | Constituent elements | Atomic mass u | Number of atoms in the molecule | Atomic mass × number of atoms | Mass of the Constituents u |
| NaHCO3 | Na | 23 | 1 | 23 × 1 | 23 |
| H | 1 | 1 | 1 × 1 | 1 | |
| C | 12 | 1 | 12 × 1 | 12 | |
| O | 16 | 3 | 16 × 3 | 48 |
The molecular mass of NaHCO3 = Sum of Constituent atomic masses
(Molecular mass of NaHCO3) = (Atomic mass of Na) × 1 + (Atomic mass of H) × 1 + (Atomic mass of C) × 1 + (Atomic mass of O) × 3
= (23 × 1) + (1 × 1) + (12 × 1) + (16 × 3)
= 23 + 1 + 12 + 48
= 84 u
APPEARS IN
RELATED QUESTIONS
Calculate the molecular mass of Cl2.
Calculate the molecular mass of C2H4.
Calculate the molecular mass of nitric acid, HNO3. (Atomic masses : H = 1 u ; N = 14 u ; O = 16 u)
Calculate the molecular masses of the following :
Oxygen, O2
(Atomic masses : H = 1 u ; O = 16 u ; Cl = 35.5 u ; N = 14 u ; C = 12 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)
Calculate the molecular masses of the following compounds :
Ethane, C2H6
(Atomic masses : C = 12 u ; H = 1 u)
How many molecules are present in one gram molecular mass of a substance ?
How many moles are there in 34.5 g of sodium ? (Atomic mass of Na = 23 u)
Calculate the molar masses of the following substances. Write the results with proper units.
- Ozone molecule, O3
- Ethanoic acid, CH3COOH
The mass of one molecule of a substance is 4.65 × 10–23 g. What is its molecular mass ? What could this substance be ?
Calculate the molecular mass of the following:
(NH2)2CO
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:
(NH₄)₂SO₄
[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]
An unknown gas shows a density of 3 g per litre at 273°C and 1140 mm Hg pressure. What is the gram molecular mass of this gas?
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?
Calculate the relative molecular mass of ZnCO3.
[Zn = 65, O = 16, C = 12]
Answer the following question using the data given below:
- Assertion: The Relative Molecular Mass of Chlorine is 35.5 a.m.u.
- Reason: The natural abundance of Chlorine isotopes are not equal.
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 are ionic and molecular compounds? Give examples.
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?
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.
