Вопрос школьника по предмету Химия
Решите пож. задачу!!! И ПОЖАЛУЙСТА С ДАНО!!!
1. Какое количество вещества оксида алюминия, образовавшегося при взаимодействии 26 г алюминия с кислородом.
Ответ учителя по предмету Химия
26 г Х моль
4Al + 3O2 -> 2Al2O3
n=4 моль n=2 моль
М = 27 г/моль
m=108 г
26 г Al — Х моль Al2O3
108 г Al — 2 моль Al2O3
n(Al2O3) = 26 * 2 / 108 = 0,48 моль
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Dear Jane,
Thank you for your letter.It was so nice to hear from you!My summer holidays were also interesting.In June I went(go) to the country.I____(spend) a month at my dacha.I rode my bike and played with my friends.It was warm but it often rained in June.So we didn`t______(swim) in the lake.But we went fishing.Once I_____(catch) a very big fish and we________(have) a tasty dinner.Sometimes my granny and I______(pick) berries in the forest
In July,my parents and I went to the sea side.We______(do) a lot of sunbathing and enjoyed the sea.I_____(not/miss) my school friends.I just dodn`t have time!:)
_______you_________(take) any pictures at the camp?Will you snd some of them to me?
Best wishes,
Anton