Phương trình :1)S+O2→SO2
2)SO2+O2→SO3
3)SO3+H2O→H2SO4
S+O2to→SO22SO2+O2to→V2O52SO3SO3+H2O→H2SO4
Choose the best answer.
I think you should buy _____ pack of mineral water instead. And you can also buy _____ snacks such as potato crisps, 3 kilos of mandarins, 2 kilos of apples, 3 bunches of bananas, ______ cookies and soft candies.
We should decorate our living room with _____ orange banner. We also need ________ ribbons, balloons, party hats and costume.
I think that ______ cauliflower is not enough for 3 people. Let’s buy one more.