Question

Ajutooooor!!!!!!!!!!​

Answer 1

Răspuns:

Explicație:

1.

60, 23 .10la 26   atomi Ca =60230 .10²³atomi Ca

masa

1mol Ca-----------6,023.10²³ atomi Ca

xmoli Ca---------------60230.10²³atomi Ca

x= 60230.10²³ : 6,023.10²³=10000moli Ca

m=n.M

m= 10000moli . 40g/moli=400000g=400kg Ca

2.

1960gK

nr.  e

n=1960 g : 39g/moli=50,26 moli K

1mol K ----------6,023.10²³atomi K ----------19 . 6,023.10²³  e

50,26 moli K---------------------------------------------x

x= 50,26 . 19  .   6,023.10²³  e  =

3.

1mol ----------A  g

3moli----------192g

x= 192 : 3= 64

4.

n-= 30g : 12g/moli= 2,5 moli C

1molC-------------6,023.10²³atomi

2,5 moli--------------x

x=2,5 .6,023.10²³=15,0575 .10²³ atomi  C

1mol Al-----------6,023.10²³atomi Al

ymoli Al------------15,0575.10²³atomi Al

y= 15,0575.10²³  : 6,023.10²³=2,5moli Al

m=2,5moli. 27g/moli=67,5 g Al

5.

mZn= 0,2moli . 65g/moli = 13g

mCu=2moli.64=128g

maliaj= 13 + 128=141g

6.

mS= 4moli .32g/moli=128g S

mFe=5moli .56g/moli=280g

mamestec=128+280=408 g

408g amestec--------128gS---------280gFe

100 g amestec-------------x---------------y

x=100.128 : 408=31,37% S

y=100.280 : 408=68,63% Fe

verifica calculele