First, we divide the number of atoms of silicon given in the problem above by Avogadro's number 6.6022 x10^23. This will give us the number of moles of silicon. Then, we multiply the number of moles by the molar mass of silicon.
number of moles = (3.6 x 10^20 atoms/6.022x10^23 atoms) = 5.97x10^-4 moles
Then, multiplying by the molar mass
(5.97x10^-4 moles)(28.0855 g/mol) = 0.017 grams
Recall that a mole is defined as Avogadros number of particles.
What the formula of caffeine basically tells us is that for every molecule of caffeine, you will have 4 atoms of nitrogen
So, if we have 0.3 moles of caffeine we will have 4*0.3 moles of nitrogen which is 0.12.
And you got the idea
Cheers
mid-1700s during the Industrial Revolution
Answer:
Explanation:
a) Zinc has a charge of plus 2 and hydrogen gas is H₂ so HCl would have a two in front to balance the equation
b) All have charges of plus one
c) Copper has a charge of plus two (given) and it needs two chlorine atoms to become stable and hence to balance the whole equation, you would need two moles of sodium hydroxide and sodium chloride
