Question

Convert 234 kJ to kcal. Only include the numerical value in your answer. Respond with the correct number of significant figures in scientific notation.

Answer 1

Answer : The correct number of significant figures in scientific notation is
`9.791* 10^2\text{ kilocalorie}`

Explanation :

The conversion used from kilojoules (kJ) to kilocalories (kcal) is:

1 Joule = 4.184 Calorie

or,

1 kilojoule = 4.184 kilocalorie

As we are given that the energy 234 kJ. Now we have to convert it into kcal.

As,
`1\text{ kilojoule}=4.184\text{ kilocalorie}`

So,
`234\text{ kilojoule}=\frac{234\text{ kilojoule}}{1\text{ kilojoule}}* 4.184\text{ kilocalorie}=9.791* 10^2\text{ kilocalorie}`

Therefore, the correct number of significant figures in scientific notation is
`9.791* 10^2\text{ kilocalorie}`

Answer 2

234 KJ ≡ 55.887 Kcal

Step-by-step explanation:

∴ J ≡ Kg/m².s² ≡ N.m = 0.2389 cal

∴ cal = 4.187 J

⇒ 234 KJ * ( 1000 J / KJ ) * ( cal / 4.187 J ) * ( Kcal / 1000 cal ) = 55.887 Kcal