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Консультация № 108999
12.11.2007, 08:12
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Уважаемые эксперты, пожалуйста помогите решить задачки. Заранее большое спасибо. C уважение Роман Александрович.
Задачки:
1) Найти молекулярную массу µ и массу m одной молекулы поваренной соли.
2) Масса m = 12 г газа занимает объём V1 = 4 л при температуре t1 = 7۫˚ C. После нагревания газа при постоянном давлении, его плотность стала равной p2 = 0,6 кг/м³. До какой температуры нагрели газ?
Задачки:
1) Найти молекулярную массу µ и массу m одной молекулы поваренной соли.
2) Масса m = 12 г газа занимает объём V1 = 4 л при температуре t1 = 7۫˚ C. После нагревания газа при постоянном давлении, его плотность стала равной p2 = 0,6 кг/м³. До какой температуры нагрели газ?
Обсуждение
Неизвестный
12.11.2007, 13:31
общий
это ответ
Здравствуйте, Чурнов Роман Александрович!
1)для нахождения молекулярной массы соли, достаточно сложить молекулярные массы ее состовляющих
M(NaCl)=M(Na)+M(Cl)=(23+35.5)гр/моль=0.0585 кг/моль
для нахождения массы одной молекулы достаточно поделить массу моля на кол-во молекул в нем, тоесть на число Авагадро
m=M(NaCl)/NA=9.75*10^-26
2)вначале найдем обьем после нагрева
V2=0.6кг/м^3*0.012кг=0.0072м^3=7.2л
т.к. давление не меняется то можно записать следующий закон V1/t1=V2/t2
откуда t2=V2*t1/V1=7.2*(7+273)/4=504К
1)для нахождения молекулярной массы соли, достаточно сложить молекулярные массы ее состовляющих
M(NaCl)=M(Na)+M(Cl)=(23+35.5)гр/моль=0.0585 кг/моль
для нахождения массы одной молекулы достаточно поделить массу моля на кол-во молекул в нем, тоесть на число Авагадро
m=M(NaCl)/NA=9.75*10^-26
2)вначале найдем обьем после нагрева
V2=0.6кг/м^3*0.012кг=0.0072м^3=7.2л
т.к. давление не меняется то можно записать следующий закон V1/t1=V2/t2
откуда t2=V2*t1/V1=7.2*(7+273)/4=504К
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