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a) 20 moli azotu cząsteczkowego
mN2=2*14u=28u
1mol N2-----28g
20moli N2----xg
x=560g
b) 15,5 moli jodu cząsteczkowego
mI2=2*127u=254u
1mol I2------252g
15,5mola-----xg
x=3937g
c) 30 minimola K2So4
mK2SO4=2*39u+32u+4*16u=174u
1mol K2SO4--------174g
0,03mola K2SO4-----xg
x=5,22g