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## Homework Statement

a) Calculate the mass of F

_{2}required to combine with N

_{2}to produce 204 kg of NF

_{3}? b) what mass of N

_{2}exactly combines with 25.91 mg of F

_{2}?

## Homework Equations

Equation: N

_{2}+ 3F

_{2}---> 2NF

_{3}Convert 204 kg to grams 204 kg X 1000 grams = 204,000 grams atomic mass of N = 14.0067 u atomic mass of F = 18.998403 u

## The Attempt at a Solution

I am not sure where to start. What is known: 204 kg of NF

_{3}, what is unknown: mass of F

_{2}, mass of N

_{2}

From the equation, there are 3 moles of F

_{2}, 1 mole of N

_{2}, and 2 moles of NF

_{3}

I can multiply the atomic mass of F (((18.998403 times 3) + atomic mass of N = 14.0067)) = 56.995 + 14.007 to get 71.002 grams of NF

_{3}

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