Find the molar mass of AI(NO3)3? Explain plz!
2 answers:
Answer:
Explanation:
The molar mass is the mass of 1 mole of a substance. These values are found on the Periodic Table because they are equal to the atomic masses, but the units are grams per mole instead of atomic mass units.
Aluminum nitrate is made up of 3 elements: aluminum, nitrogen, and oxygen. Look up the molar masses of the individual elements.
- Al: 26.981538 g/mol
- N: 14.007 g/mol
- O: 15.999 g/mol
Let's analyze the chemical formula: Al (NO₃)₃
NO₃ is in parentheses with a subscript of 3 after. This means there are 3 nitrate ions in 1 mole of aluminum nitrate. Find the molar mass of a nitrate ion, multiply by 3, then add aluminum's molar mass.
- NO₃ = 14.007 + 3(15.999) = 14.007+47.997 =62.004 g/mol
- (NO₃)₃ = 3(62.004) =186.012 g/mol
- Al (NO₃)₃ = 26.981538 + 186.012 = 212.993538 g/mol
We can round to the nearest hundredth. The 3 in the thousandth place tells us to leave the 9 in the hundredth place.
- Al(NO₃)₃ ≈ 212.99 g/mol
The molar mass of aluminum nitrate is approximately <u>212.99 grams per mole.</u>
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Complete question is;
When a diprotic acid is titrated with a strong base, and the Ka1 and Ka2 are significantly different, then the pH vs. volume plot of the titration will have
a. a pH of 7 at the equivalence point.
b. two equivalence points below 7.
c. no equivalence point.
d. one equivalence point.
e. two distinct equivalence points
Answer:
Option E - Two Distinct Equivalence points
Explanation:
I've attached a sample diprotic acid titration curve.
In diprotic acids, the titration curves assists us to calculate the Ka1 and Ka2 of the acid. Thus, the pH at the half - first equivalence point in the titration will be equal to the pKa1 of the acid while the pH at the half - second equivalence point in a titration is equal to the pKa2 of the acid.
Thus, it is clear that there are two distinct equivalence points.
