Alkali metals = Group 1A
Halogens = Group 7A
Gdnndjfndmnxndndndjdjdjxncncncnnc
Answer:
CaCO3
Explanation:
From the question we were told that Calcium carbonate contains the following:
Ca = 1atom
C = 1atom
O = 3atoms
Combining the above together we will have: CaCO3
Answer:
Total number of water molecules produced after the reaction is 1.956×10^22 molecules of water.
Explanation:
By the reaction
H2+ 1/2 O2 → H2O
Moles of O2 = 5.2\32
⇒1 mole of O2 produce 1 mole of H2O
1 mole O2 will produce 2 mole of H2O
Therefore, 5.2\32 mole will produce 
⇒ Molecules of H2O will be
= 
= 1.956×10^22 moleculesof H2O.