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Консультация № 187065
26.12.2012, 14:58
96.56 руб.
0
3
1
Уважаемые эксперты! Пожалуйста, ответьте на вопрос:
(P.S:Eсли не сложно обоснуйте ответ пожалуйста)
1)Сколько граммов метилового спирта CH3OH следует растворить в 500г воды,чтобы снизить температуру её замерзания на 10 градусов? Криоскопическая константа воды K=1,86.
1)5,4г 2)26,9г 3)86г 4)290,6г
2)Какая из указанных реакций имеет краткую ионную форму: H+ + OH=H2O ?
Ответ обосновать.
1)Ca(OH)CI+HCI= 2)(MgOH)2SO4+H2SO4=
3)H2S+NaOH= 4)HCI+NH4OH=
3)Составьте молекулярные и ионно-молекулярные уравнения реакций,протекающих при смешивании растворов:
a)гидросульфата калия и гидроксида калия
б)нитрата свинца(II) и гидрокисида натрия
p.s Зарания Спасибо!
(P.S:Eсли не сложно обоснуйте ответ пожалуйста)
1)Сколько граммов метилового спирта CH3OH следует растворить в 500г воды,чтобы снизить температуру её замерзания на 10 градусов? Криоскопическая константа воды K=1,86.
1)5,4г 2)26,9г 3)86г 4)290,6г
2)Какая из указанных реакций имеет краткую ионную форму: H+ + OH=H2O ?
Ответ обосновать.
1)Ca(OH)CI+HCI= 2)(MgOH)2SO4+H2SO4=
3)H2S+NaOH= 4)HCI+NH4OH=
3)Составьте молекулярные и ионно-молекулярные уравнения реакций,протекающих при смешивании растворов:
a)гидросульфата калия и гидроксида калия
б)нитрата свинца(II) и гидрокисида натрия
p.s Зарания Спасибо!
Обсуждение
26.12.2012, 23:36
общий
это ответ
Здравствуйте, Сидоров Максим Владимирович!
1)
Изменение температуры замерзания для разбавленных растворов может быть рассчитано по формуле [$916$]T=Kn2
где n2 — моляльная концентрация растворенного вещества.
n2=[$916$]T/K
А по определению
n2=[$957$]/m2
где:
[$957$] — количество растворённого вещества, моль;
m2 — масса растворителя, кг.
[$957$]=n2m2=[$916$]T m2/K=10*0.5/1,86=2,688 моль
Молекулярный вес этилового спирта равен 12+4+16=32
Масса спирта =32 г/моль *2,688 моль =86 г
2)
NH4+ + OH- + H+ + CL- = NH4+ + CL- + H2O
OH- + H+ = Н2О
1)
Изменение температуры замерзания для разбавленных растворов может быть рассчитано по формуле [$916$]T=Kn2
где n2 — моляльная концентрация растворенного вещества.
n2=[$916$]T/K
А по определению
n2=[$957$]/m2
где:
[$957$] — количество растворённого вещества, моль;
m2 — масса растворителя, кг.
[$957$]=n2m2=[$916$]T m2/K=10*0.5/1,86=2,688 моль
Молекулярный вес этилового спирта равен 12+4+16=32
Масса спирта =32 г/моль *2,688 моль =86 г
2)
NH4+ + OH- + H+ + CL- = NH4+ + CL- + H2O
OH- + H+ = Н2О
Форма ответа
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