What is the percent by mass of a sample of ocean water that is found to contain 1.36 g of magnesium ion per 1000.0 ml of water?
How do you answer this????
2007-03-07 10:06:57 · 5 answers · asked by hello there 2 in Science & Mathematics ➔ Chemistry
This would seem simple, but I'm not sure the question is worded well.
1000ml of pure water weighs 1kg... by definition. Sea water? hmm, let's look: 1030g/1000ml (see link)
so 1.36g / 1030g = 0.132% by mass.
2007-03-07 10:12:56 · answer #1 · answered by TankAnswer 4 · 0⤊ 0⤋
How much does the sample water weigh?
So here is a hint. When you talk about water in general if there is no other indications you can assume it to be 1g per mL. This is not really true especially for ocean water, but it is close enough.
How much does the substance weigh?
What percent is the substance of the sample?
Thats all ur gettin from me but i think it should be easy enough from here.
2007-03-07 18:12:41 · answer #2 · answered by bourgoise_10o 5 · 0⤊ 0⤋
OK i am not sure if this is right cause I am still in middle school but,
Percent - mL
100 - 1000
(?) - 1.36
= 0.136% or magnesium Ion in 1000 mL of water.
And I am right....
2007-03-07 18:21:31 · answer #3 · answered by DisturbedRocks 3 · 0⤊ 0⤋
1000ml water = 1000g
therefore
1.36/1000 *100 =0.136%
2007-03-07 18:13:26 · answer #4 · answered by master2303 1 · 0⤊ 0⤋
as a percentage....by mass
2007-03-07 18:11:42 · answer #5 · answered by Anonymous · 0⤊ 0⤋