Question

In cite grame de:
a)H2O
b)PH3
c)H2CO3
se gasesc 6 hidrogen?

Va rog cit de repede se poate ,dau puncte ​

Answer 1

a) M ( masa molara) H2O = 2+16 = 18

1 mol de H2O = 18 g

18g H2O.........2g H

x g H2O..........6g H => ( rezultă) că x=18g×6÷2=54 g

b) M ( masa molara) PH3 = 31+3=34

1 mol de PH3 = 34 g

34g PH3..........3g H

x g PH3............6g H => (rezulta) x=34×6÷3=68g

c) M ( masa molara) H2CO3  = 14+48= 62

1 mol de H2CO3 = 62 g

62g H2CO3.......2gH

x g H2CO3.........6gH  => ( rezulta) x=62×6÷2=186g

Answer 2

a.

H2O

-se afla masa molara

MH2O=2+16=18-------> 18g/moli

18 g H2O--------2g H

xg H2O-------------6g H

x=18. 6 : 2=54 gH

b.

PH3

M=31+ 3=34------->34g/moli

34g PH3---------3g H

X----------------------6gH

X=34 . 6 : 3=68g H

c.

H2CO3

M=2+12+3.16=62-------> 62g/moli

62g H2CO3---------2g H

X----------------------------6g

X=62 . 6 :2=186 g H2CO3