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x - 5dm
x= 0.1 mola
1mol - 12.04 * 10do 23
0.1 - x
x=1.204 * 10 do 23 cząsteczek
b) 1 mol - 6.02 x 10 do 23
0.1 (wiesz to z pkt a ) - x
x=0.602 * 10 do 23
c) 1 mol- 71g
0.1 - x
x= 7.1 g