Solution with explaination
Dear student,
Molar mass of cane sugar (C12H22O11) is 342.29 g/mol. the heat of combustion reaction for sugar for 1 mol it is -1349 Kcal. For 2870 Kcal , total moles would be = 2870/1349 = 2.127 moles. So, Weight of sugar = 2.127*342 = 728 g with regards!