Question

Ajutor va rog mult .​

Answer 1

Răspuns:

Explicație:

1.

MNaCl= 23 +35,5=58,5-------> 58,5 g/moli

58,5 g NaCl-------23 g Na

5,85g -----------------xg

x= 5,85 . 23 : 58,5=2,3 g Na

n= 2,3g : 23g/moli=0,1 moli Na

2.

MCO2= 12 +2.16=44------> 44g/moli

44g CO2--------32g O

xg--------------------12,8 gO

x= 44 .12,8 : 32=17,6 g CO2

n= 17,6g : 44g/moli= 0,4 moli CO2

3.

MCO= 12 +16=28 -----> 28g/moli

M CaCO3= 40 +12 +3.16=100------> 100g/moli

28g CO---------12gC

56g CO-----------x

x=56.12 : 28 =24g C

100g CaCO3---------12gC

50g -----------------------yg

y= 50.12 : 100=6g C

24+ 6=30 g C in total ------> 30000mg C