Advertisements
Advertisements
प्रश्न
Calculate the number of atoms of each kind in 5.3 grams of sodium carbonate.
Advertisements
उत्तर
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
संबंधित प्रश्न
Calculate the relative molecular mass of Potassium chlorate.
(use K = 39, Cl = 35.5, O = 16, C = 12, H = 1, Na = 23, N = 14, S=32)
Calculate the relative molecular mass of Chloroform.
(use K = 39, Cl = 35.5, O = 16, C = 12, H = 1, Na = 23, N = 14, S= 32)
Fill in the blank.
Molecular weight of a gas is twice its __________.
Potassium nitrate on strong heating decomposes as under :
2KNO3 → 2KNO2 + O2
Calculate : Weight of potassium nitrite formed.
(K = 39, 0 = 16, N = 14)
Washing soda has the formula Na2CO3.10H2O.What is the mass of anhydrous sodium carbonate left when all the water of crystallization is expelled by heating 57.2 g of washing soda?
When excess lead nitrate solution was added to a solution of sodium sulphate, 15.1g of lead sulphate was precipitated. What mass of sodium sulphate was present in the original solution?
Na2SO4 + Pb(NO3)2 → PbSO4 + 2NaNO3
(H = 1, C = 12, O = 16, Na = 23, S = 32, Pb = 207)
Samples of the gases O2, N2, CO2 and CO under the same conditions of temperature and pressure contain the same number of molecules represented by X. The molecules of Oxygen, occupy V litres and have a mass of 8 g. Under the same conditions of temperature and pressure :
What is the mass of CO2 in g?
A compound 'X' consists of 4.8% of C and 95.2% of Br by mass.
Name the type of chemical reaction by which X can be prepared from ethane.
Calculate the volume occupied at S.T.P. by 2 moles of SO2.
Ammonia burns in oxygen and the combustion, in the presence of a catalyst, may be represented by;
\[\ce{2NH3 + 2 1/2O2 -> 2NO + 3H2O}\] [H = 1, N = 14, O = 16]
What mass of steam is produced when 1.5 g of nitrogen monoxide is formed?
