Ответ учителя по предмету Химия
Дано:
m(Na)=69 г
М(Na)=23 г/моль
М(NaOH)=40 г/моль
Найти:
m(NaOH)
69 г Х г
2 Na. + 2 H2O. -> 2NaOH. + H2
n=2 моль n=2 моль
М=23 г/моль М=40 г/моль
m=46 г m=80 г
69 г Na. — Х г NaOH
46 г Na. — 80 г NaOH
m(NaOH) = 69 * 80 / 46 = 120 г
Похожие вопросы от пользователей
{19(у+х)=100+12у
Meet Tiny.He lives in the English forest.He is funny and kind. He is smart and merry.Tiny can speak and read English. He lives to write fairy tales and poems.
Here is one of his poems.
I can read I can sing
I can write my fairy tales
And what about you?
Tiny has got a lot of friends. they like Tiny»s poem and fairy tales. They often walk in the forest and play chess together. зарание спс