How many grams of #H_3PO_4# are in 175 mL of a 3.5 M solution of #H_3PO_4#?

1 Answer
Nam D.
Apr 4, 2018

Around #60# grams.

Explanation:

We have a #3.5 \ "M"# solution of phosphoric acid with #175 \ "mL# of it in there. This means that there are:

#(3.5 \ "mol")/(color(red)cancelcolor(black)"L")*0.175color(red)cancelcolor(black)"L"=0.6125 \ "mol"#

So, there exist #0.6125# moles of phosphoric acid here.

Phosphoric acid has a molar mass of #97.994 \ "g/mol"#.

So here, the mass is:

#0.6125color(red)cancelcolor(black)"mol"*(97.994 \ "g")/(color(red)cancelcolor(black)"mol")~~60 \ "g"#

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