Укажите типы реакций: а) 2k + 2h2o = 2koh + h2 ↑ б) cao + h2o = ca (oh)2 в) so3 + h2o = h2so4

Question

Химия: Укажите типы реакций: а) 2k + 2h2o = 2koh + h2 ↑ б) cao + h2o = ca (oh)2 в) so3 + h2o = h2so4

Nastyapetrushicheva · Accepted Answer

дано

m(ppaNaCL) = 292.5 g

W(NaCL) = 10%

m(ppa AgNO3) = 136 g

W(AgNO3) = 25%

m(AgCL) - ?

NaCL+AgNO3-->AgCL+NaNO3

m(NaCL) = m(ppa NaCL) * W(NaCL) / 100% = 292.5 *10 / 100 = 29.25 g

m(AgNO3) = m(ppa AgNO3) * W(AgNO3) / 100% = 136 * 25 / 100 = 34 g

M(NaCL) = 58.5 g/mol

n(NaCL) = m(NaCL) / M(NaCL) = 29.25 / 58.5 = 0.5 mol

M(AgNO3) = 170 g/mol

n(AgNO3) = m(AgNO3) / M(AgNO3) = 34 / 170 = 0.2 mol

n(NaCL) > n(AgNO3)

n(AgNO3) = n(AgCL) = 0.2 mol

M(AgCL) = 143,5 g/mol

m(AgCL) = n(AgCL) * M(AgCL) = 0.2*143.5 = 28.7 g

ответ 28.7 гр

Объяснение: