moscow, russia
23/04/2019
dear kelly,
thank you for your recent letter. i was very glad to get. in your letter you asked me some questions.
in your letter you asked me about sport. i believe that it is very important to have a healthy lifestyle a going in for sports. as for you, you should train every day. also, it is very important to believe in yourself and in your abilities. i think, if you are well built, you shouldn't lose weight. but if you have excess weight, you should do it.
that's all for now.
write back soon.
best wishes,
(твоё имя)
11,5 г х л
2na + h2so4 -> na2so4 + h2
n = 2 моль n = 1 моль
м = 23 г/моль vm=22,4 л/моль
m = 46 г v = 22,4 л
11,5 г na - х л н2
46 г na - 22,4 л н2
v(h2) = 11,5 * 22,4 / 46 = 5,6 л
Поделитесь своими знаниями, ответьте на вопрос:
1.оксид металла : сu2o оксид меди (i)
оксид неметалла: so2 - оксид серы (iv)
2. ba(oh)2 -bao
koh - k2o
h2so4 - so3
al(oh)3 - al2o3