Question

Answer the questions in the spaces below: Zn = 65.4; Cl = 35.5; Na = 23.0; O = 16.0; H = 1.0; C = 12.0 amu

1. Balance the equation below then calculate the moles of a) iron metal, and b) carbon monoxide formed from 0.350 moles of Fe2O3: Δ Fe2O3(s) + CO(g) ïƒ Fe(s) + CO2(g) Ans.:

a)

b)

2. Balance the equation below then calculate the mass of ZnCl2 that can be obtained from 10.0 g of zinc metal and an excess of hydrochloric acid: Zn(s) + HCl(aq) ïƒ ZnCl2(aq) + H2(g)and Ans.:

3. A student prepared Na2CO3 by bubbling CO2 through an aqueous solution of NaOH: 2 NaOH(aq) + CO2(g) ïƒ Na2CO3(aq) + H2O(l) If the student obtained 5.60 g of Na2CO3 from 10.3 g of NaOH, what is the % yield in the reaction? Ans.:

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