Advertisements
Advertisements
Question
Calculate the number of atoms of each kind in 5.3 grams of sodium carbonate.
Advertisements
Solution
Molecular mass of Na2CO3 = 106 g
106 g has 2 x 6.02 x 1023 x 2 atoms of Na
So, 5.3g will have = `(6.02 xx 10^23 xx 2)/106 xx 5.3`
= 6.022 x 1022 atoms
Number of carbon atoms = `(6.02 xx 10^23)/106 xx53/10`
= 3.01 x 1022 atoms
And number of oxygen atoms = `(3 xx 6.02 xx 10^23)/106 xx 53/10`
= 9.03 x 1022
APPEARS IN
RELATED QUESTIONS
Calculate the relative molecular mass of Ammonium sulphate.
(use K = 39, Cl = 35.5, O = 16, C = 12, H = 1, Na = 23, N = 14, S= 32)
10g of NaCl solution is mixed with 17g of silver nitrate solution. Calculate the weight of silver chloride precipitated.
AgNO3 + NaCl → AgCI + NaNO3
Water can split into hydrogen and oxygen under suitable conditions. The equations representing the change is: 2H2O(I) → 2H2 (g) + O2(g)
Ammonia burns in oxygen and the combustion in the presence of a catalyst may be represented as:
2NH3 (g) +21/2O2 (g) → 2NO (g) + 3H2O (I)
What mass of steam is produced when 1.5 g of nitrogen monoxide is formed?
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?
Calculate the percentage of nitrogen in aluminium nitride. [Al = 27, N = 14]
The equation for the burning of octane is:
\[\ce{2C6H18 + 25O2 -> 16CO2 + 18H2O}\]
If the relative molecular mass of carbon dioxide is 44, what is the mass of carbon dioxide produced by burning two moles of octane?
A certain gas 'X' occupies a volume of 100 cm3 at S.T.P. and weighs 0.5 g. Find its relative molecular mass.
Calculate the relative molecular mass of:
Potassium chlorate
Calculate the relative molecular mass of:
CH3COONa
Calculate the mass of nitrogen supplied to soil by 5 kg of urea [CO(NH2)2].
[O = 16; N = 14; C = 12; H = 1]
