Question: 1.Which of the following compounds contains a metal ion with 2+ charge? A. Cu2S B. NiCr207 C.Pb(SO4)2 D. Hg2C12 2.when reaction carried out with.3.00 g of N2 and 1.05 g H2 for the reaction below, 3.55g of NH3 were obtained. What is the percent yield of NH3 N2(g) +3H2(g)=2NH3(g) 3. Determined the theoretical yield (grams) of N2 when 50.0 g N204 and 30.0 g N2H4 are used for the reaction. N204(1)+2N2H4(1)=3N2(g) + 4H2O(g)

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Mole Concept

Mole concept is a method to determine the amount of any substance that consists of some elemental particles using a grouping unit called ‘mole’. The mole concept enables one to handle the large amount of small elementary particles. The mole concept can be used in many calculations related to mole calculation, molar amount, mole ratio, and so on, which are significant in chemistry.