Ответ:

дано

m(ppa H2SO4) = 150 g

W(H2SO4) = 10%

m(ppa NaOH) = 100 g

W(NaOH) = 5%

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m(Na2SO4) - ?

m(H2SO4) = 150*10% / 100% = 15 g

M(H2SO4) = 98 g/mol

n(H2SO4) = m/M = 15 / 98 = 0.15 mol

m(NaOH)= 100*5% / 100% = 5 g

M(NaOH) = 40 g/mol

n(NaOH) = m/M = 5 / 40 = 0,125 mol

n(H2SO4) > n(NaOH)

H2SO4+2NaOH-->Na2SO4+2H2O

2n(NaOH) = n(Na2SO4)

n(Na2SO4) = 0.125 / 2 = 0.0625 mol

M(Na2SO4) = 142 g/mol

m(Na2SO4) = n*M = 0.0625 *142 = 8,875 g

ответ 8.875 гр

Объяснение: