1) calculate the number of molecules in 50g of calcium carbonate
2) calculate the number of moles for the following.
a.64g of oxygen atom
b.24*10 powered by 23 number of oxygen atom
3)calculate the formula unitmass of
a) calcium chloride b) sodium sulphite c) ammonium carbonate
4) calculate the no. of moles sulphur (Sg) present in 16g of solid sulphur
5) write the chemical formula using criss cross method
a)ammonium sulphate b)sodium sulphate c) barium nitrate
Answers
1. - Calcium carbonate is CaCO3 so there is (in one mole) 40g of calcium because there would be one mole of that, 12g of carbon because there ...
2.
A. One mole of any substance has 6.022140857×10^23 molecules. Thus, 3.556 moles of Oxygen has 21.412 * 10^23 number of molecules. The atomic mass of an oxygen atom is 16 grams.
B. volume of mixture of 6.023*10^23 oxygen atoms and 3.01*10^23 ... Find the number of mole oxygen and hydrogen.use pv=nrt equation.
3.
A. 40.078 u ± 0.004 u
B. 78.0452 g/mol
C. 96.09 g/mol
4. of molecules of sulphur (S8) present in 16 g of solid sulphur
5.
A. (NH4)2 (SO4)1 = (NH4)2SO4 Magnesium bicarbonate Mg2+ HCO31− Cross multiply Mg1(HCO3)2 = Mg(HCO3)2 Barium nitrate ...
B. Na2SO4
C. (NH4)2 (SO4)1 = (NH4)2SO4 Magnesium bicarbonate Mg2+ HCO31
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