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Ответ:
Zn + cl2 ---> ZnCl2
calculate the number of moles of Zn
that is mass/molar mass of Zn(65.38g/mol)
moles= 4g/65.38 g/mol= 0.021moles
the reacting ratio of zinc to ZnCl2 is 1:1 from the reaction above
therefore the moles of Zncl2 is also 0.021 moles
mass= number of moles x molar mass
The molar mass of ZNCl2 = 65.38 + (35.2 x2) = 136.38 g/mol
Therefore the mass of Zncl2 = 0. 021 moles x 136.38 g/mol=2.86 grams