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3 years ago

Convert 19 kcal into joules

Chemistry

1 answer:

il63 [147K]3 years ago

7 0

$19~ \text{kcal} = 19 \times 1000 ~\text{cal } = 19000~ \text{cal} = 19000 \times 4.184~ \text{J} = 79496~ \text{J}$

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There is some info missing. I think this is the complete question.

<em>Carbon dioxide gas is collected at 27.0 °C in an evacuated flask with a measured volume of 30.0L. When all the gas has been collected, the pressure in the flask is measured to be 0.480atm. </em>

<em> Calculate the mass and number of moles of carbon dioxide gas that were collected. Be sure your answer has the correct number of significant digits.</em>

<em />

Step 1: Given data

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n = ?

m = ?

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We can calculate the moles of CO₂ using the ideal gas equation.

$P.V=n.R.T\\n=\frac{P.V}{R.T} =\frac{0.480 atm \times 30.0L }{(0.08206atm.L/mol.K) \times 300.2K} =0.585mol$

Step 3: Calculate mass of CO₂

We know that the molar mass is 44.01 g/mol. Then,

$0.585mol.\frac{44.01g}{mol} =25.7g$

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4 years ago