Răspuns :

Răspuns:

a) 1 mol Mg ....... 24 g

2 moli Mg ...... X

X=2×24=48g

b) 1mol Ag ...... 108 g

0,5 moli Ag...... X

X=108×0,5=54g

c) 0,5kmoli =500 moli

1 mol Ag..... 108 g

500 moli ...... X

X=500×108=54000 g

d) 1 mol C ...... 12 g

X ....... 120 g

X = 120÷12=10 moli

e) 120kg=120000g

1mol C ....... 12 g

X ....... 120000g

X=120000÷12=10000 moli

f) 1mol Li...... 7g

X...... 3.5 g

X=3,5÷7=0,52

Explicație: