Answer: 88.2 g
Solution:
1) Chemical equation:
<span>2Al (s) + 3Fe(NO3)2 (aq) → 3Fe (s) + 2Al(NO3)3 (aq)
2) Theoretical molar ratios
2 mol Al : 3 mol Fe(NO3)2 : 3 mol Fe : 2 mol Al(NO3)3
3) Starting mass of pure iron nitrate
% = (mass of iron nitrate / mass of solution) * 100 = 87.5
=> mass of iron nitrate = 87.5 * mass of solution / 100
mass of solution = 325 g
=> mass of iron nitrate = 87.5 * 325 g / 100 = 284.375 g
4) moles of iron nitrate
moles = mass in grams / molar mass
molar mass of Fe(NO3)2 = 179.85 g/mol
moles = 284.375 g/ 179.85 g/mol = 1.58 moles Fe(NO3)2
5) proportion:
x 3 mol Fe
--------------------------- = ----------------------
1.58 mol Fe(NO3)2 3 mol Fe(NO3)2
Clear x:
x = 1.58 mol Fe
6) Convert 1.58 mol Fe into grams
mass = number of moles * atomic mass
atomic mass of iron = 55.845 g / mol
mass = 1.58 moles * 55.845 g/mol = 88.24 g
Rounded to 3 significant figures: 88.2 grams of Fe.
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Answer:
Explanation:
a) O (oxygen) but there's not enough info to determine the isotope
b) superscript-37 subscript-17 Cl
c) superscript-60 subscript-27 Co
d) superscript-57 subscript-26 Fe
e) don't know what you mean here
f) superscript-7 subscript-3 Li
Edit:
a) superscript-17 subscript-8 O
e) superscript-131 subscript-53 I
Atoms are electrically neutral because they have equal numbers of protons (positively charged) and electrons (negatively charged).
Answer:
No.
Step-by-step explanation:
When looking at numbers after the decimal point, think of the numbers as real numbers.
In 1.25, think of the .25 as just 25.
Since this is after the decimal point, it is 25 of a 100.
Now, is 25 closer to 4 or not?
Of course, the number has a great distance from 4.
<em>-kiniwih426</em>
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