Сколько структурных частиц содержится в 0,25 моль сu

There are a lot of wonderful places to visit. as for me i would like to visit germany. there are a lot of sights. there are museums, cathedrals, theaters. i like nature. you can see a fabulous nature in germany. i want to speak with foreigners because i want to improve my german skills. germany is worth to visit. i want to travel to germany with all my friends. i think it would be great.

n=na(число авогардро) * v(ню)

n(cu)=6,02*10(-23степени) * 0,25=1,505 *10(-23степени)

Мне кажется x=300×100÷40=750(г.)

H2O - Вода. Имеет степень окисления 0
H202- Перекись водорода -1

28,4 может? Ну вот по сути