Aresearcher studying the nutritional value of a new candy places a 4.40-gram sample of the candy inside a bomb calorimeter and combusts it in excess oxygen. the observed temperature increase is 2.87 °c. if the heat capacity of the calorimeter is 41.50 kj·k–1, how many nutritional calories are there per gram of the candy?

Nutritional calories per gram of candy =

Explanation:

Total amount of heat released due to combustion of the candy = ()

where is the heat capacity of calorimeter and is the increase in temperature.

Here, = 41.50 kJ/K and = (273+2.87) K = 275.87 K

So, Total amount of heat released due to combustion of the candy =

Now, 1 kJ = 0.239 nutritional cal

So, 11449 kJ =

hence nutritional calories per gram of candy =

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer