1. The molar ration between CO2 and CH4 is 1:1. So when 2.5 moles of CH4 is reacted, 2.5 moles of CO2 is produced.
So the mass of CO2=44 g/mol *2.5 mol=110 g
The answer is b
2. The molar mass of MgCl2=24+35.5*2=95 g/mol
So the moles of MgCl2=286/95=3.01 mol
The molar ration between AgCl and MgCl2 is 2:1. So when 3.01 moles of MgCl2 is reacted, 2*3.01=6.02 moles of AgCl is produced.
The answer is d
3. The molar mass of H3PO4=3*1+31+16*4=98 g/mol
So the moles of H3PO4=120/98=1.22 mol
The molar ration between Mg3(PO4)2 and H3PO4 is 1:2. So when 1.22 moles of H3PO4 is reacted, 1.22*1/2=0.61 moles of H3PO4 is produced.
The molar mass of Mg3(PO4)2=24*3+(31+16*4)*2=262 g/mol
So the mass of Mg3(PO4)2=262*0.61=160 g
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