The molar mass of Ca(NO₃)2 is 164 g/mol
<u><em> Explanation</em></u>
Ca(NO₃)2 is made up of Ca , N and O elements
Therefore the molar mass of Ca(NO₃)2 = molar mass of Ca + molar mass of N +molar mass of O
from periodic table the molar mass of Ca is 40 g/mol
for N = 14 g/ mol
for O = 16 g/mol. since they are 3 atoms of O in Ca(NO₃)2 the molar mass = 16 x3 = 48 g/mol
The molar mass of Ca(NO₃)2 = 40 g/mo + [(14 g/mol + 48 g/mol) 2] =164g/mol
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Chemical changes are considered unseen because they occur at the atomic level, changing the actual structure of the thing.
Answer: 8.7 grams
Explanation:
According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number 
of particles.
To calculate the moles, we use the equation:
As oxygen is in excess, Aluminium is the limiting reagent and limits the formation of products.
According to stoichiometry:
4 moles of aluminium give = 2 moles of 
Thus 0.17 moles of aluminium give=
Mass of 
Thus the mass of is 8.7 grams
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