Answer the following questions about Fe(NO3)3.
a. What is the mass percent of iron in this compound?
b. A different iron compound is 34.43% by mass iron. What mass of this compound is needed to get 125g of
pure iron?
You aren't telling me what you think. Do you know how to get percent? That's
%Fe = [(mass Fe/mass Fe(NO3)3]*100 = ? Use atomic masses and molar mass for mass.
For part b plug the numbers in part b into the equation I gave you for % and turn the crank.
thank you very much, if i am correct i think the answer for part b. should be approximately 363g?
You're right. Go to the head of the class.
thank you, I greatly appreciate your help.
To answer these questions, we need to understand how to calculate the mass percent and use it to find the mass of a compound.
a. To find the mass percent of iron in Fe(NO3)3, we need to know the molar masses of iron and the entire compound. The molar mass of iron (Fe) is approximately 55.85 g/mol. The molar mass of Fe(NO3)3 can be calculated by summing up the molar masses of its constituent elements:
- Molar mass of Fe(NO3)3 = (molar mass of Fe) + 3 x (molar mass of N) + 9 x (molar mass of O)
The molar mass of nitrogen (N) is approximately 14.01 g/mol, and the molar mass of oxygen (O) is approximately 16.00 g/mol.
Once you have the molar mass of Fe(NO3)3, you can calculate the mass percent of iron using the formula:
- Mass percent of iron = (mass of iron / mass of Fe(NO3)3) x 100
b. To find the mass of another iron compound needed to obtain a certain mass of pure iron, we can set up a proportion to calculate it.
Let's assume the mass of the iron compound required is "x" grams. We know that this compound is 34.43% by mass iron, meaning it contains 34.43 grams of iron for every 100 grams of the compound.
By setting up the proportion:
- (mass of iron compound / 100 g) = (mass of iron / 34.43 g)
We can solve for the mass of the iron compound (x) using the given mass of pure iron (125 g).
These calculations involve basic chemistry concepts and mathematical operations. You can use a periodic table and a calculator to determine the molar masses and perform the calculations accurately.