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Calculate the molecular mass of the following:
Mg3N2
Given atomic mass of Cu = 63·5, H = 1, O = 16, C = 12, N = 14, Mg = 24, S = 32
Molecular mass of Mg3N2
= (3 × 24) + (2 × 14)
= 72 + 28
= 100
What information does the following chemical equation convey?
Zn + H2SO4 → ZnSO4+ H2
What information do the following chemical equations convey? Mg + 2HCl → MgCl2+ H2
What are polyatomic ions? Give two examples.
Name the fundamental law that is involved in every equation.
What is the valency of :
fluorine in CaF2
What is the valency of :
sulphur in SF6
What is the valency of :
phosphorus in PH3
What is the valency of :
carbon in CH4
What is the valency of :
nitrogen in the following compounds:
(i) N2O3 (ii) N2O5 (iii) NO2 (iv) NO
Why should an equation be balanced? Explain with the help of a simple equation.
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