The burning of 1.0 g of coal produces 35 000 joules of energy. How many kcals are produced? The answer comes out to 8.4kcal but I can't figure out how to come up with the answer using the proper conversion formula.

Question

The burning of 1.0 g of coal produces 35 000 joules of energy. How many kcals are produced?  The answer comes out to 8.4kcal but I can't figure out how to come up with the answer using the proper conversion formula.

anonymous · Answer

$$35000J*\frac{.239Cal}{1J}*\frac{1kcal}{1000Cal}\approx8.365$$

rounding you get 8.4

anonymous · Answer

@PinkKris

anonymous · Answer

@secretcat my chem book says 1 cal = 4.184 J.

anonymous · Answer

o... well then just substitute that

anonymous · Answer

I'm confused bc the answer in the book is 35000j. Not understanding how that is the answer with their conversions

anonymous · Answer

I'm getting 0.035j