Final answer:
To find the mass of LiNO3, multiply the number of moles by the molar mass. To find the moles of oxygen atoms, multiply the number of moles of LiNO3 by the number of oxygen atoms per mole. To find the mass of N atoms, multiply the number of moles of LiNO3 by the molar mass of nitrogen. The number of moles of LiNO3 is already given.
Step-by-step explanation:
To find:
A) g of LiNO3
B) mol of oxygen atoms
C) g of N atoms
D) mol of LiNO3
E) None of the above
A) g of LiNO3:
Given 0.400 mol of LiNO3, you can use the molar mass of LiNO3 to convert moles to grams:
1 mol LiNO3 = 85 g LiNO3
0.400 mol LiNO3 x 85 g LiNO3/mol LiNO3 = 34 g LiNO3
So, the mass of LiNO3 is 34 g.
B) mol of oxygen atoms:
In the formula LiNO3, there are 3 oxygen atoms. So, multiply the number of moles of LiNO3 by the number of oxygen atoms per mole of LiNO3:
0.400 mol LiNO3 x 3 mol O/mol LiNO3 = 1.20 mol O
So, the number of moles of oxygen atoms is 1.20 mol.
C) g of N atoms:
In the formula LiNO3, there is 1 nitrogen atom. So, multiply the number of moles of LiNO3 by the molar mass of nitrogen:
0.400 mol LiNO3 x 14.0 g N/mol LiNO3 = 5.60 g N
So, the mass of nitrogen atoms is 5.60 g.
D) mol of LiNO3:
The given information is already in terms of moles of LiNO3, so there is no need for conversion. The number of moles of LiNO3 is 0.400 mol.