Homework Help: Chemistry

Posted by Marty on Saturday, October 20, 2007 at 4:56pm.

A hydrated MgSO4 salt, weighing 3.211g, is heated in a crucible until reaching a constant weight. The weight of the anhydrous MgSO4 is 1.570 grams.

1. Calculate the moles of H20 removed and the moles of anhydrous MgSO4 remaining in the crucible.

2. What is the formula for the hydrated MgSO4?

Chemistry - bobpursley, Saturday, October 20, 2007 at 5:20pm
You can calculate the weight of the removed water. Change that to moles.

Next, change the grams of anhydrous sulfate salt to moles.

Compare the ratio of those two: that is the prefix x on the hydraded salt

MgSO4.xH2O

I will be happy to critique your thinking or work.
Chemistry - Marty, Saturday, October 20, 2007 at 5:36pm
How do I change the weight of the water removed into moles?
Chemistry - bobpursley, Saturday, October 20, 2007 at 5:40pm
moles water=masswater/molmass of water

where molmas is 18g/mole (you need to figure it more accurately, 2 H and one O)
Chemistry - Marty, Saturday, October 20, 2007 at 5:43pm
Would the weight of the water removed be 3.211g - 1.570 g?
Chemistry - bobpursley, Saturday, October 20, 2007 at 6:59pm
yes, of course.

Answer this Question

Related Questions

chemistry - when 1.40 g of hydrated magnesium salfate is heated to constant mass...
Chemistry - I am a bit lost as to how to go about answering this question. Any ...
Chem Lab - I did a chem lab and have to figure out some stuff off of some data I...
Chem Lab - I did a chem lab and have to figure out some stuff off of some data I...
Chemistry - A 2.914 gram sample of gypsum, a hydrated salt of calcium sulfat, ...
Chemistry - A 1.994-g sample of gypsum, a hydrated salt of calcium sulfate, ...
chemistry - A 1.994 g sample of gypsum, a hydrated salt of calcium sulfate, ...
Chemistry. Check my answer please! - A 1.994 g sample of gypsum, a hydrated salt...
10th grade - how many moles of anhydrous MgSO4 are in 2.04grams of MgSO4
chemistry - a student takes 4.597g of hydrated barium chloride and heats it in a...

For Further Reading

First Name:
School Subject:
Answer: