Question

Convert each of the following energy units:

a. 3500 cal to kcal

b. 415 J to cal

c. 28 cal to J

d. 4.5 KJ to cal

Short answer

a.$3.5kcal$

b.$99.2cal$

c.$117.2J$

d.$1075.5cal$

Step-by-step solution

introduction

A calorie is a unit of energy. In sustenance, calories allude to the energy individuals get from the food and drink they polish off, and the energy they use in active work.

explanation

a. we know, $1\mathrm{kcal}=1000\mathrm{cal}$

then, $3500cal=\frac{{\displaystyle 3500}}{1000}=3.5kcal$

b. we know, $1\mathrm{cal}=4.184\mathrm{J}$

then, $415J=\frac{415}{4.184}=99.2cal$

c. we know, $1\mathrm{cal}=4.184\mathrm{J}$

then, $28cal=28\times 4.184=117.2J$

d. we know, $1\mathrm{kcal}=4.184\mathrm{kJ}$

then,$\frac{4.5}{4.184}\times 1000=1075.5cal$