What I can’t understand I’m American
Answer:
its 19 I'm pretty sure about
Answer: 7.8 moles of NaCl result from the complete reaction of 3.9 mol of 
Explanation:
To calculate the moles :

As
is the excess reagent,
is the limiting reagent as it limits the formation of product.
According to stoichiometry :
1 mole of
gives = 2 moles of 
Thus 3.9 moles of
will give=
of 
7.8 moles of NaCl result from the complete reaction of 3.9 mol of 
Answer:
% comp. H = 2.8%, % comp. Cl = 97.2%
Explanation:
HCl mass = mass of H + mass of Cl
HCL mass = 1.00794 + 35.453 = 36.46094
% comp. of H = 1.007694 / 36.46094 x 100 = around 2.8% (2.76376308455)
% comp. of Cl = 35.453 / 36.46094 x 100 = around 97.2% (97.2355622208)