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Consider the balanced equation. 2HCl Mg Right arrow. MgCl2 H2 If 40. 0 g of HCl react with an excess of magnesium metal, what is the theoretical yield of hydrogen? 1. 11 g 2. 22 g 52. 2 g 104 g.

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hadassahyakubu

Answer:

2Hcl  +mg--->MgCl2+ H2

The  theoretical  yield  of  hydrogen  is  calculated  as  follows

calculate  the  moles  of  Hcl

mass/molar  mass

40g/36.5=1.096  moles

by  use  of  mole  ratio  of  Hcl to  H2 which  is  2:1

moles  of  H2=1.096  /2=0.548moles

mass  is  therefore= moles  x molar  mass

that is  0.548moles  x 2  =1.096 grams