Question

supposed only a small amount of your peanut burned and a large amount of another student's peanut burned. why will you have similar results for the amount of heat evolved? should you both get similar results for your calculation of the calories content per gram for both peanuts. why or why not?

Use your value of 2.5kcal/g to calculate the number of calories in one ounce of peanuts. show all wok in your calculation

Answer 1

Answer – We are given that one student has only a small amount of peanut burned and a large amount of another student's peanut burned, then also they have similar results for the amount of heat evolved and it is true, since both student burn peanut with different weight, but the results of the mass difference and change in temperature are compare the same ratio for both students. We know formula for calculating heat evolved as follows –

q = m x C x ∆T

So the actual mass burns of peanut for both students are different and also different change in temperature, but comparatively both differences are relatively same. Example as follow –

Suppose Student A burn mass of peanut 1 g and another student B burn peanut mass 2 g.

Student A got the temperature different 1 ^oC and for student B got temperature different 2^oC, since he has burn more amount of peanut.

For peanut C is constant for both

So results of energy evolved for student A and student B will be same, since there is a ratio of mass and change in temperature are nearly same and hence getting have similar results for the amount of heat evolved.

Now we need to convert mass of one ounce to gram

We know

1 ounce = 28.3495 g

We are given 2.5 kcal/g energy, mean for 1 g of peanut there are 2.5 kcal heat is evolved, so for 28.3495 g is as follow

1 g = 2.5 kcal

So, 28.3495 g = ? kcal

= 70.87 kcal

We know

1 kcal = 1000 cal

So, 70.8737 kcal = ? cal

= 70873.7 cal

So, in one ounce of peanuts there are 70873.7 number of calories