Răspuns:
calculam in grame
MS=32g/mol
MSO2=32+2×16=64g/mol
32g..........64g
S + O2 →SO2
640g..........xg
x=640×64/32=1280g SO2
calculeam in moli
n=m/M=640/32=20moli S
1mol..........1mol
S + O2 →SO2
20mol...........ymoli
y=20×1/1=20moliSO2
Explicație: