What is the percent composition of water in #"Na"_2"SO"_4 * 10"H"_2"O"#?

Answer 1

Sodium sulfate decahydrate is #55.9 %"H"_2"O"#.

Your goal here is to figure out how many grams of water you have in #"100 g"# of sodium sulfate decahydrate, #"Na"_2"SO"_4 * 10"H"_2"O"#.
To do that, start with what you know. More specifically, start with the fact that #1# mole of sodium sulfate decahydrate contains
You also know that sodium sulfate has a molar mass of #"142.04 g mol"^(-1)# and that water has a molar mass of #"18.015 g mol"^(-1)#. This means that #1# mole of sodium sulfate decahydrate contains

and has a total mass of

#"142.04 g"color(white)(.) + 10 xx "18.105 g" = "322.19 g"#
This means that #"100 g"# of sodium sulfate decahydrate will contain
#100 color(red)(cancel(color(black)("g Na"_ 2"SO"_ 4))) * (10 xx "18.015 g H" _ 2"O")/(322.19 color(red)(cancel(color(black)("g Na"_ 2"SO"_ 4)))) = "55.9 g H"_2"O"#

Therefore, you can say that the percent composition of water in this hydrate is equal to

#color(darkgreen)(ul(color(black)("% H"_2"O" = 55.9%)))#
Keep in mind that the #%# sign means out of #"100 g"# of hydrate.
Sign up to view the whole answer

By signing up, you agree to our Terms of Service and Privacy Policy

Sign up with email
Answer 2

Seventy-two percent of "Na"_2"SO"_4 * 10"H"_2"O" is water.

Sign up to view the whole answer

By signing up, you agree to our Terms of Service and Privacy Policy

Sign up with email
Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

Not the question you need?

Drag image here or click to upload

Or press Ctrl + V to paste
Answer Background
HIX Tutor
Solve ANY homework problem with a smart AI
  • 98% accuracy study help
  • Covers math, physics, chemistry, biology, and more
  • Step-by-step, in-depth guides
  • Readily available 24/7