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# chemistry?

Complete combustion of 2.00 metric ton of coal (assuming pure carbon) to gaseous carbon dioxide releases 6.60 × 1010 J of heat. Convert this energy to the following units. Give your answers in scientific notation.

(a) kilojoules:

(b) kilocalories:

(c) British thermal units:

### 2 Answers

- jacob sLv 74 weeks agoFavorite Answer
To convert from Joules to kiloJoules:

6.6 x 1010 Joules * (1 kJ / 1000 J) = 6.6 x 107 kJ

To convert from Joules to kCal:

6.6 x 1010 Joules * (1 Calorie / 4.184 Joules) * (1 KCal / 1000 Cal) = 1.577 x 107 KCal

To convert from Joules to BTU:

6.6 x 1010 Joules * (1 BTU / 1055.06 Joules) = 6.256 x 107 BTU

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- Dr WLv 74 weeks ago
use dimensional analysis (See the other problem you posted)

for each question ask

.. (1) what am I converting from

.. (2) what am I converting to

.. (3) what unit factors do we have / need?

you try it.