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Home Q & A Board Science-Related Homework Help Chemistry (Moderator: Laser_3)
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OldSpice OldSpice
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9 years ago
An unknown hydrate of calcium nitrate, Ca(NO3)2 • XH2O, is heated to give 30.5% water. What is the water of crystallization (X) for the hydrate?
A) 2
B) 3
C) 4
D) 6
E) 10
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ElectricElectric
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9 years ago
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.silent.boss

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OldSpice Author
wrote...
#2
9 years ago
Perfect!

..Thank you so much for your support
wrote...
#3
9 years ago
My pleasure
.silent.boss
wrote...
#4
3 years ago
Step1 [ (18x)/(18x+164)]* 100 = 30.5 ; molar mass of water is 18 ;molar mass of Ca(NO3)2 x H2O= 18x+162

Step2 Divide both sides by 100

Step3 18x /18x+162 = .305

Step4 18x = 18x * .305 + 162x.305

Step5 18x(1-.305)= 162x.305 or x= 162 x.305/.695*18 or x=3.95 =4
Anonymous
wrote...
#5
A year ago
So, who is right?

Quote from: Madi Yeager (3 years ago)
Step1 [ (18x)/(18x+164)]* 100 = 30.5 ; molar mass of water is 18 ;molar mass of Ca(NO3)2 x H2O= 18x+162 Step2 Divide both sides by 100 Step3 18x /18x+162 = .305 Step4 18x = 18x * .305 + 162x.305 Step5 18x(1-.305)= 162x.305 or x= 162 x.305/.695*18 or x=3.95 =4
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