7. Supply the needed conversion and solve. ?g 1 12sa = 4.5 mio! H2SO4 - 8. In th

Question

7. Supply the needed conversion and solve. ?g 1 12sa = 4.5 mio! H2SO4 - 8. In the chemical reaction of iron and sulfur, how many moles of sulfur are needed to react with 1.42 mol or iron? 2Fe + 3S FeS: 9. In the engines of cars and trucks, nitrogen and oxygen from the air react at high temperature to produce nitrogen monoxide, a component of smog. a. Write the balanced chemical equation. b. What molar mass is needed to convert grams of Oz to moles of O c. What mole ratio is needed to convert moles of O2 to moles of NO? d. What molar mass is needed to convert moles of NO to grams of NO?

Explanation / Answer

7.

need conversion

molar mass of H2SO4 = 98.079 g/mol

4.5 mol = 4.5 mol x 98.079 g/mol = 441.36g

8.

2Fe + 3S ----->Fe2S3

sulfur to iron conversion equation can be written as 3 mol S / 2 mol Fe

for 1.42 mol Fe

moles of S required = 3 mol S / 2 mol Fe x 1.42 mol Fe = 2.13 mol S

9.

(a) N2 + O2 --->2NO

(b) 32g O2 = 1 mol O2

(c) mole ratio from O2 to NO = 2 mol NO / 1 mol O2

(d) mass of NO = mass of N(14g) + mass of O(16g) = 30g/mol

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