meilad6
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Report Thread starter 8 months ago
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Can someone plz help me with C

Mohr’s salt, (NH4)2Fe(SO4)2.6H2O, is a blue-green crystalline solid usually made by dissolving equimolar amounts of iron(II) sulfate and ammonium sulfate in dilute sulfuric acid and then crystallising. The reaction may be represented by the equation
FeSO4.7H2O + (NH4)2SO4 → (NH4)2Fe(SO4)2.6H2O + H2O

(a) What mass of Mohr’s salt would be produced from 2.78g of iron(II) sulfate with excess ammonium sulfate, if the yield in the reaction was 80%?
A 2.22g
B 2.78g
C 3.14g
D 3.92g

(b) How many cations are there in each mole of Mohr’s salt?
[Avogadro constant, L = 6.0 × 10^23 mol−1]
A 6.0 × 1023
B 1.2 × 1024
C 1.8 × 1024
D 3.0 × 1024

(c) What is the percentage by mass of water in Mohr’s salt?
A 4.6%
B 18%
C 28%
D 72%
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charco
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(Original post by meilad6)
Can someone plz help me with C

Mohr’s salt, (NH4)2Fe(SO4)2.6H2O, is a blue-green crystalline solid usually made by dissolving equimolar amounts of iron(II) sulfate and ammonium sulfate in dilute sulfuric acid and then crystallising. The reaction may be represented by the equation
FeSO4.7H2O + (NH4)2SO4 → (NH4)2Fe(SO4)2.6H2O + H2O

(a) What mass of Mohr’s salt would be produced from 2.78g of iron(II) sulfate with excess ammonium sulfate, if the yield in the reaction was 80%?
A 2.22g
B 2.78g
C 3.14g
D 3.92g

(b) How many cations are there in each mole of Mohr’s salt?
[Avogadro constant, L = 6.0 × 10^23 mol−1]
A 6.0 × 1023
B 1.2 × 1024
C 1.8 × 1024
D 3.0 × 1024

(c) What is the percentage by mass of water in Mohr’s salt?
A 4.6%
B 18%
C 28%
D 72%
What exactly is the problem?
Do you not understand the meaning of the equation?
Have you learned relative formula mass?
Do you not know the meaning of "percentage".
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meilad6
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Report Thread starter 8 months ago
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(Original post by charco)
What exactly is the problem?
Do you not understand the meaning of the equation?
Have you learned relative formula mass?
Do you not know the meaning of "percentage".
yes I do know all that but I cant get the right answer for C
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