Question

Срочно!!!!!!!!!!!!!!!

Answer 1

1)

4P+5O2-->2P2O5

2NaBr+CL2->2NaCL+Br2

2HBr-->H2+Br2

4Li+O2-->2Li2O

BaO+2HCL-->BaCL2+H2O

2)

2HCL+Ca(OH)2-->CaCL2+2H2O

N2O3+H2O-->2HNO2

2Fe(OH)3-->Fe2O3+H2O

2AgNO3+BaCL2-->Ba(O3)2+2AgCL

3)

дано

m(ppa сах) = 100 g

W( сах) = 20%

m2(ppa сах) = 80 g

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W1(сах)-?

m1(сах) = m(ppa сах) * W(сах) / 100% = 100*20% / 100% = 20 g

W1(сах) = m1( сах) / m2(ppa сах) * 100% = 20 / 80 * 100% = 25%

ответ 25%