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Alja [10]
3 years ago
6

Please I neeed help, I have to write: four ammonia molecules (NH3) react with four oxygen molecules(O2) to form four nitrogen mo

noxide molecules (NO) and six water molecules. All substances are in gaseous state and heat is released in the chemical reaction
Chemistry
1 answer:
Dafna1 [17]3 years ago
6 0

Explanation:

the equation must be

4NH3 + 5O2–> 4NO + 6H2O

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Suppose 3.68g of zinc was allowed to react with hydrochloric acid to produce zinc chloride and hydrogen gas. How much zinc chlor
valentina_108 [34]

Answer:

Percent yield = 86.2%

Explanation:

Given data:

Mass of zinc = 3.68 g

Mass of zinc chloride = ?

Percent yield = ?

Actual yield = 7.12 g

Solution:

Chemical equation:

Zn + 2HCl  → ZnCl₂  + H₂

Number of moles of zinc:

Number of moles  = Mass /molar mass

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Now we will compare the moles of ZnCl₂ with zinc.

                 Zn            :               ZnCl₂

                  1               :               1

                 0.06           :            0.06

Theoretical yield of zinc chloride:        

Mass of ZnCl₂ = moles × molar mass

Mass of ZnCl₂ = 0.06 mol × 136.286 g/mol

Mass of ZnCl₂ =  8.2 g

Percent yield:

Percent yield = actual yield / theoretical yield × 100

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Percent yield = 86.2%

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