Asked by Autumn
What mass of solid potassium sulfate, K2SO4, is used to make up exactly 100.0cm^3 of 0.100 mol/dm^3 SO4^2-?
This should be a very easy, 1-mark question but for some reason I can't wrap my head around it.
moles = mass/Mr, so all you gotta do is moles x molecular mass. Mr is 174.3, but I'm unsure about how to calculate moles. Thanks in advance for your help!
This should be a very easy, 1-mark question but for some reason I can't wrap my head around it.
moles = mass/Mr, so all you gotta do is moles x molecular mass. Mr is 174.3, but I'm unsure about how to calculate moles. Thanks in advance for your help!
Answers
Answered by
DrBob222
How many mols SO4^2- are in K2SO4; i.e., 1 mol K2SO4 contains 1 mol SO4^2-. Now how many mols K2SO4 do you need? That's mols = mols/dm^3 x dm^3 = 0.1 mol/dm^3 x 0.1 dm^3 = ?
Now convert to grams. grams - mols K2SO4 x molar mass K2SO4 = ?
Now convert to grams. grams - mols K2SO4 x molar mass K2SO4 = ?
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