After a chemical reaction ,the total mass of reactants annd products a)is always increased b)always decreased c)is not changed d)us always lesd or more e)is always changed
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Ответы на вопрос:
after a chemical reaction ,the total mass of reactants annd products
c)is not changed
after a chemical reaction ,the total mass of reactants and products
c)is not changed
because the mass of the initial substances is equal to the mass of the reaction products.
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