Balanced equation: 10 CaCo3 + 20 HCl = 10 CaCl2 + H20 + 15 Co2
Answer: b
. Covalent compounds can contain a maximum of 4 different atoms.
Explanation:
The covalent compounds are those compounds that are formed between the non-metals via sharing of electrons. The bonds so formed between these non-metallic atoms are covalent. There can be two or several different kinds of atoms that can form covalent bonds with each other in a single molecule. They use the valence electrons for sharing. The maximum number of valence electrons can be seven.
10.53 grams is the theoretical yield of CaF2 for this experiment.
Explanation:
From the reaction it can be found that Ca reacts with excess of fluoride gas to form calcium fluoride. Thus, it can be concluded that calcium is limiting reagent as product formation depends on the concentration of calcium in the reaction as reactant.
The balanced chemical reaction is :
Ca + F2 ⇒ CaF2
Thus one mole of calcium reacted to form one mole of calcium fluoride.
Number of moles of calcium fluoride can be obtained by using the formula;
number of moles=
=
= 0.135 moles of CaF2 is formed.
So,
1 mole of calcium reacts to give 1 mole of CaF2
x moles of calcium will give 0.135 moles of CaF2
Hence, 0.135 moles of CaF2 is formed
the weight formed will be given as 0.135 x 78.07
= 10.53 grams
The theoretical yield is the amount of product formed by complete conversion of limiting reactant. Thus, 10.53 grams is the theoretical yield of CaF2 in the reaction.