Question

ajutorr repede cu tot cu formule

Answer 1

H2SO4
M=2+32+4.16=98------>1mol=98g

98 gH2SO4-----------1mol H2SO4
4,9 g------------------------xmoli
x=4,9:98=0,5 moli H2SO4
                                                      23
1molH2SO4------------4  . 6,023 .10    atomi O
0,5 moli-----------------y atomi            23
                         y = 0 , 5 .4 .6,023.10  atomi O


2kg NaOH
M=23+16+1=40------->1mol=40g                             1kg=1000g
40g-----------1 mol
2000g------- xg
x=2000:40=50moli NaOH
                                            23
1mol NaOH----------6,023.10   atomi  O
50 moli ----------------y                   23
                             y=50 .6,023.10  atomi O


5kmoli H2O
5kmoli=5000moli                     23
1 molH2O----------6,023.10   atomi O
5000moli------------x               23
                    x=5000.6,023.10   atomi O


2moli Ca(OH)2
M=40+2.16+2=74-------->1mol=74 g              23
1molCa(OH)2-------------------------2 . 6,023.10       atomi O
2moli-----------------------------------x                 23
                                           x=2 .2  .6,023.10     atomi O