•3.9g of ammonia
•molar mass of ammonia = 17.03g/mol
1st you have to covert grams to moles by dividing the mass of ammonia with the molar mass:
(3.9 g)/ (17.03g/mol) = 0.22900763mols
Then convert the moles to molecules by multiplying it with Avogadro’s number:
Avogadro’s number: 6.022 x 10^23
0.22900763mols x (6.022 x 10^23 molecs/mol)
= 1.38 x 10^23 molecules
If you where to randomly pick two nonmetals that have less than 10 protons it would be Hydrogen and carbon.
Answer:
Ca(2+)
Explanation:
Sodium (Na) only have one valence electron and will lose it in order to gain a full octet. There will be an unbalance of electrons and protons where there are more protons there electrons. The correct ion formula for sodium is Na (1+).
Nitrogen has 5 valence electrons and will gain three more to gain a full octet. There will be an unbalance where there are more electrons then protons. Nitrogen will form the ion N (3-).
Calcium has two valence electrons and will lose them in order to gain a full octet. There will be an unbalance where there are more protons then electrons. Calcium will form the ion Ca 2+
Therefore, Ca2+ is the ion with the correct charge.
This the chemical equation of the reaction of Al and HCl
Al + HCl → AlCl3 + H2 (g)
When you balance the atomos you get:
2Al + 6HCl → 2AlCl3 + 3H2 (g) ------- you can check that here you have the same number of atoms of Al, H, and Cl in both sides.
The coefficients are:
2 for Al, 6 for HCl, 2 for AlCl3 , and 3 for H2.
Then, the answer is: the coefficient of HCl is 6