Consider the following reaction. How many grams of sucrose would produce 2546 kcal?

Question

Consider the following reaction.  How many grams of sucrose would produce 2546 kcal?

Quizplus · Accepted Answer

1 kcal is equivalent to 4.184 kJ of energy.
The combustion of sucrose produces 5640 kJ/mol of energy.
The molar mass of sucrose is 342.3 g/mol.
Therefore, the energy produced by 1 mole of sucrose is:
5640 kJ/mol = (5640/4.184) kcal/mol = 1346 kcal/mol
To find the amount of sucrose needed to produce 2546 kcal:
2546 kcal / 1346 kcal/mol = 1.8938 mol
The mass of 1.8938 mol of sucrose is:
1.8938 mol x 342.3 g/mol = 649.4 g
Therefore, the answer is A) 649.4 g.

Consider the Following Reaction