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Question

xMount Wachusett Comm x Y write and balan write and balance a ne mod/ibis/view.php?id- 1629259 21 of 37 orrect Chemistry Fundamentals an Map a) The balanced reaction equation for combustion of heptane, CHs, is given below. If the reaction produced 36.5 g CO2, how many grams of heptane were burned? CM,6 +1 102 Number 83.13 g C,H 7CO2 + 8H20 b) The reaction of limestone with hydrochloric acid is given below. If the reaction produced 36.5 g CO2, how many grams of HCI reacted? CaCO, + 2HCl CaCl; + CO: + H20 Number g HCI O Previous Give Up & View solution (2) Check Answer 0 Next Exit

Explanation / Answer

1.No of moles of CO2=mass/molar mass=36.5g/44g/mol=0.8295mol

1 mole of heptane gives 7 moles of CO2 .then 0.8295mol of CO2 produced from=1molx0.8295mol/7mol=0.1185mol of heptane

amount of heptane reacted=no of molesxmolar mass=0.1185mol x100.21g/mol=11.875g

2.No of moles of CO2=mass/molar mass=36.5g/44g/mol=0.8295mol

2 moles of HCl gives 1 mole of CO2 .then 0.8295mol of CO2 produced from=2molx0.8295mol/1mol=1.659 mol of HCl

amount of HCl reacted=no of molesxmolar mass=1.659mol x36.46g/mol=60.49g

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