2 Listen and underline the word in each group with the different vowel sound. a) June do uncle

b) niece sister Dean

c) have father Charles

d) Pearl meal heard

e) George daughter people

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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:

ответ: 1)

        mgso4   +     2naoh => mg(oh)2 + na2so4

2)

n=1                                                         n=2

m=24+32+16*4                                   m=29+16+1

m=88                                                     m=46

3)

m(mgso4)=80*88/46=153г

объяснение: