The total number of atoms represented by the formula Fe3(PO4)2 is
2 answers:
Answer:
C.
Explanation:
We have to keep in mind for this question that we have to take into account the <u>subscripts</u>.
The <u>subscript will affect only the number in the left</u>, so the first part would be:
In this part we will have 3 iron atoms. Then we will have:
In the we will have 1 atom of P and 4 atoms of O. (When we dont have any number as subscript we have to <u>assume that we have a "1</u>")
Then we have a "2" out side the the parenthesis , so we have to multiply by "2" all the <u>atoms inside the parenthesis</u>, so:
1 atom of P x 2 = 2
4 atoms of O x 2 = 8
So, in total we will have:
3 atoms of Fe + 8 atoms of O + 2 atoms of P = <u>13 atoms</u>
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Answer:
0.00369 moles of HCl react with carbonate.
Explanation:
Number of moles of HCl present initially = moles = 0.00600 moles
Neutralization reaction (back titration):
According to above equation, 1 mol of NaOH reacts with 1 mol of 1 mol of HCl.
So, excess number of moles of HCl present = number of NaOH added for back titration = moles = 0.00231 moles
So, mole of HCl reacts with carbonate = (Number of moles of HCl present initially) - (excess number of moles of HCl present) = (0.00600 - 0.00231) moles = 0.00369 moles
Hence, 0.00369 moles of HCl react with carbonate.