|
Calculate the number of aluminium ions (Al3+) in 0.056 g of alumina (AL203)
|
|
1
|
10139
|
July 3, 2020
|
|
Calculate the ratio between the mass of one atom of hydrogen and mass of one atom of silver
|
|
0
|
5611
|
March 19, 2018
|
|
In photosynthesis, 6 molecules of carbon dioxide combine with an equal number of water molecules through a complex series of reactions to give a molecule of glucose having a molecular formula C6H1206
|
|
0
|
4773
|
March 19, 2018
|
|
A sample of ethane (C2H6) gas has the same mass as 1.5 X 10^20 molecules of methane (CH4). How many C2H6 molecules does the sample of gas contain
|
|
0
|
2954
|
March 19, 2018
|
|
A silver ornament of mass ‘m’ gram is polished with gold equivalent to 1% of the mass of silver. Compute the ratio of the number of atoms of gold and silver in the ornament
|
|
0
|
1677
|
March 19, 2018
|
|
Compute the difference in masses of one mole each of aluminium atoms and one mole of its ions. (Mass of an electron is 9.1 X 10^-28 g). Which one is heavier?
|
|
0
|
1660
|
March 19, 2018
|
|
A gold sample contains 90% of gold and the rest copper. How many atoms of gold are present in one gram of this sample of gold
|
|
0
|
2542
|
March 19, 2018
|
|
Compute the number of ions present in 5.85 g of sodium chloride
|
|
0
|
3601
|
March 19, 2018
|
|
The mass of one steel screw is 4.11g. Find the mass of one mole of these steel screws. Compare this value with the mass of the Earth (5.98 X 10^24kg). Which one of the two is heavier and by how
|
|
0
|
1284
|
March 19, 2018
|
|
The difference in the mass of 100 moles each of sodium atoms and sodium ions is 5.48002 g. Compute the mass of an electron
|
|
0
|
1563
|
March 19, 2018
|
|
What is a mole? What is the unit of mole? How many molecules are there in a certain mass of a substance?
|
|
0
|
5178
|
March 19, 2018
|
|
Calcium chloride when dissolved in water dissociates into its ions according to the following equation. CaCl2 (aq)----->Ca2+ (aq) + 2CI- (aq)
|
|
0
|
7238
|
March 19, 2018
|
|
Find the ratio of mass of the combining elements in the following compounds
|
|
0
|
2574
|
March 19, 2018
|
|
Verify by calculating that 5 moles of C02 and 5 moles of H20 do not have the same mass. 240 g of calcium and 240 g of magnesium elements have a mole ratio of 3 :5
|
|
0
|
1494
|
March 19, 2018
|
|
Calculate the mass per cent of each element present in the molecule of calcium carbonate
|
|
0
|
5426
|
March 19, 2018
|
|
Arrange the following in order of decreasing masses: 10^23 molecules of C02 gas 0.1 g atom of silver 1 gram of carbon 0.1 mole of H2S04 10^23 atoms of calcium
|
|
0
|
8174
|
March 19, 2018
|
|
Raunak took 5 moles of carbon atoms in a container and Krish also took 5 moles of sodium atoms in another container of same weight. Whose container is heavier? Whose container has more number of atoms?
|
|
0
|
1507
|
March 19, 2018
|
|
Calculate the number of particles in each of the following: 46 g of Na atom 8 g of 02 molecules 0.1 moles of carbon atom
|
|
0
|
3828
|
March 19, 2018
|
|
Calculate the mass per cent of each element of sodium chloride in one mole of it
|
|
0
|
6642
|
March 19, 2018
|
|
Calculate the number of moles present in: 3.011 X 10^23 number of oxygen atoms. 60 g of calcium
|
|
0
|
17425
|
March 19, 2018
|
|
How many molecules,hydrogen atoms,oxygen atoms are there in 0.5 mol of water?
|
|
0
|
7844
|
March 19, 2018
|
|
Give three significance of mole
|
|
0
|
5166
|
March 19, 2018
|
|
What are ionic and molecular compounds? Give examples
|
|
0
|
2837
|
March 19, 2018
|
|
Calculate the molecular mass of the following: H2C03,C2H5OH,MgS04
|
|
0
|
6820
|
March 19, 2018
|
|
Classify each of the following on the basis of their atomicity
|
|
0
|
1946
|
March 19, 2018
|
|
Calculate the mass percentage of oxygen present in the following compounds and state the law of chemical combination associated. Given, H = 1, O = 16. Water (H20) and Hydrogen peroxide (H202)
|
|
0
|
12292
|
March 19, 2018
|
|
Write the cations and anions present (if any) in the following compounds: CH3COONa NaCl H2 NH4NO
|
|
0
|
1819
|
March 19, 2018
|
|
Does the solubility of a substance change with temperature? Explain with the help of an example
|
|
0
|
2096
|
March 19, 2018
|
|
How many atoms would be present in a black dot marked on the paper with graphite pencil as a full stop at the end of a sentence
|
|
0
|
6296
|
March 19, 2018
|
|
Carbon dioxide produced by action of dilute hydrochloric acid on potassium hydrogen carbonate is moist whereas that produced by heating potassium hydrogen carbonate is dry
|
|
0
|
9713
|
March 19, 2018
|