8g H2 ........................x moli
2g H2.........................1 mol
x=8/2=4 moli H2
48000g O2..............x moli
32g O2...................1 mol
y=1500 moli O2
2. 3000 moli C .............................xg
1 mol C ....................................12g
x=12*3000=36000g C