a) M SO3= A S +3×A O=32+3×16=32+48= 80 g /mol
1 mol SO3............. 80 g SO3
x moli SO3........... 800 g SO3
1/x=80/800=>x=10 moli SO3
b) M H2SO4= 2×A H + A S +4×A O =2×1+32+4×16= 2+32+64= 98 g/mol
1 mol H2SO4......... 98g H2SO4
x moli H2SO4........ 980 H2SO4
1/x=98/980=>x=10 moli H2SO4
1 mol H2O.=6_023×10²³ molecule
10 moli H20=n molecule
n=10×6,023×10²³ =6,023×10²⁴
M HNO3= A H +A N +3×A O =1+14+3×16= 1+14+48=63 g /mol
1 mol HNO3........ 63 g HNO3
x moli HNO3........ 630 g HNO3
1/x=63/630=>x=10 moli HNO3
1 mol HNO3 =6,023×10²³
10 moli =10× 6,023×10²³= 6,023×10²⁴
M NH3= A N +3×A H =14+3=17 g /mol
1 mol =6,023×10 ²³
17g = 6,023×10²³ molecule
