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liraira [26]
3 years ago
9

PLEASE LHELP

Chemistry
1 answer:
rosijanka [135]3 years ago
8 0

Answer:

12

Explanation:

6 moles multiplied 2 atoms of O2

That gives 12 atoms

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Students in a chemistry class added 5 g of Zinc (Zn) to 50 g of hydrochloric acid (HCl). A chemical reaction occurred that produ
marin [14]

Answer: 11 g

Explanation:

Zn + 2HCl    →   ZnCl₂ + H₂

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Number of moles = 5 g / 65.38 g/mol

Number of moles = 0.08 mol

Number of moles of HCl :  

Number of moles = 50 g / 36.5 g/mol

Number of moles = 1.4 mol

Compare the moles of both reactant with zinc chloride:

             Zn             :           ZnCl₂

              1             :             1

             0.08       :        0.08

           HCl          :         ZnCl₂

             2            :           1

            1.4          :         1/2×1.4 =0.7 mol

The number of moles of zinc chloride produced by Zn are less so it will limit reactants.

Mass of zinc chloride:

Mass = 0.08 mol × 136.3 g/mol

<u>Mass = 11 g</u>

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