25.0 g of a calcium carbonate sample decomposes on heating to give carbon dioxide and 10.0 g calcium oxide. What will be the percentage purity of calcium carbonate in the sample? (Atomic weight: )
71.44
80
62.5
90.5
Related Questions
A 20 L vessel contains 0.1 mole of at 300 K. is prepared in the vessel by subjecting to silent electric discharge till the volume is reduced to 15 L at 300K. What is the number of moles of formed?
0.05
0.025
0.075
0.01
One mole of contains:
None of the above
Volume occupied by molecules of acetylene at NTP is:
1 mol of contains
atoms of H
4 g.atom of Hydrogen
molecules of
3.0 g of carbon
Two elements P and Q react to form compounds with formulas and . If 0.1 mole of weighs 5 g and 0.2 mole of weighs 14 g, what are the atomic masses of P and Q?
P = 20, Q = 15
P = 40, Q = 5
P = 30, Q = 10
P = 10, Q = 20
A gaseous mixture contains oxygen and nitrogen in the ratio of by weight. Therefore, the ratio of their number of molecules is:
What is the number of atoms present in 1 mole of oxygen gas?
6.022 x 10^23
2 * 6.022 x 10^23
3 * 6.022 x 10^23
4 * 6.022 x 10^23
25.0 g of a calcium carbonate sample decomposes on heating to give carbon dioxide and 10.0 g calcium oxide. What will be the percentage purity of calcium carbonate in the sample? (Atomic weight: )
71.44
80
62.5
90.5
How many moles are present in 18g of water (H2O)?
1 mol
0.5 mol
2 mol
18 mol
In which of the following is the number of water molecules maximum?
0.00224 L of water vapours at 1 atm and 273 K
0.18 g of water
18 ml of water
10⁻³ mol of water
