термохимическое уравнение реакции горения метана: 

CH4 + 2O2 = CO2 + 2H2O + 878 кДж

Какое количество теплоты выделится при сгорании 4,48 л (н. у.) метана ?

Решите биквадратное уравнение

8(10-3x)^2-5(10-3x)-3=0

при соединении 4,2 г железа с серой выделилась теплота, соответствующая 7,15 кДж. Составьте термохимическое уравнение этой реакции.

Сумма первых трех членов пропорции равна 58. Третий член составляет 2/3, а второй - 3/4 первого члена. Найти четвертый член пропорции.

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2. performed, given, fulfilled, displayed

3. Everyone, Someone, Anyone, No-one

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5. right, exact, direct, strict

6. period, minute, part, stage

7. led, taken, drawn, called

8. over, against, through, across

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10. interests, needs, purposes, regards