• Support PF! Buy your school textbooks, materials and every day products via PF Here!

What is the formula for the hydrate?

  • Thread starter gigi9
  • Start date
41
0
Chemistry help plz!!

I've tried to work out the problem below, but I got weird answer, it's not even in one of the choices. Please help me solve this problem and show me out u got it. Thank you.
A sample of a hydrate of BaCl2 with a mass of 61 grams was heated until all the water was removed. The sample was then weighed and found to have a mass of 52 grams. What is the formula for the hydrate?
(A) BaCl2 * 5H2O
(B) BaCl2 * 4H2O
(C) BaCl2 * 3H2O
(D) BaCl2 * 2H2O
(E) BaCl2 * H2O
 
137
1
show us what you did first
 
41
0
Ba=137.3gtams Cl2=71 grams
BaCl2=208.3 grams --> but the answer in book says BaCl2 =244 grams.
61 grams - 52 grams = 9 grams
9grams / 18grams (H2O) = 1/2
so my answer is BaCl2 * 1/2 H2O, which doesn't make any sense @ all, and it's not one of the answer choices.
 
92
0
ok so you have 1/2 moles of H20, how many moles of BaCl2 do you have? balance them out and you'll get the answer.
 

Related Threads for: What is the formula for the hydrate?

Replies
5
Views
3K
  • Posted
Replies
5
Views
10K

Physics Forums Values

We Value Quality
• Topics based on mainstream science
• Proper English grammar and spelling
We Value Civility
• Positive and compassionate attitudes
• Patience while debating
We Value Productivity
• Disciplined to remain on-topic
• Recognition of own weaknesses
• Solo and co-op problem solving
Top