A sample of seawater contains 6.2777 g of sodium chloride per liter of solution. How many mg of sodium chloride would be contained in 15 ml of this solution?
2007-02-06 08:08:11 · 10 answers · asked by Ashboo 2 in Science & Mathematics ➔ Chemistry
Ok so, each litre has 6.2777g right, so you set it up like this
6.2777/1 L
so now divide 6.2777 by 1000 to get mL and how much is in each mL in grams (answer is 0.0062777) multiply that by 15 you get 0.0941655grams per 15mL, and since you want mg and there are 1000mg in each gram, you multiply that answer by 1000 and you have 94.1655mg of sodium chloride per 15ml of solution!
2007-02-06 08:13:39 · answer #1 · answered by Anonymous · 1⤊ 0⤋
You are given the concentration of NaCl in grams per liter.
To find the quantity of sodium chloride in the sample, use the relationship of milliliters (ml) to liters and of milligrams (mg) to
grams. It is 1 : 1,000 .
2007-02-06 08:20:07 · answer #2 · answered by foxvalley 2 · 0⤊ 0⤋
This is just a units problem.
You've got 6.277g/liter, and you want that in terms of mg/ml
To do that, you write down the original units, then multiply or divide as needed to arrive at the units you want:
(6.277g / l) * (1000mg / g)* (l / 1000ml) = 6.277 mg/ml
Sine you had to multiply by 1000 and then divide by 1000, the value in this new set of units is the same.
Okay, so now just multiply by 15 ml so you end up with mg alone.
(6.277 mg / ml) * 15 ml = 94.115 mg
2007-02-06 08:15:02 · answer #3 · answered by Argon 3 · 0⤊ 0⤋
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2016-11-25 20:45:17 · answer #4 · answered by ? 4 · 0⤊ 0⤋
1 L = 1000 mL so, if you have 6.2777g NaCl/1000 mL how many grams are in 15 mL?
Then, convert to mg, 1 g = 1000 mg
2007-02-06 08:18:33 · answer #5 · answered by raerae_2001 3 · 0⤊ 0⤋
I am no mathematician, but, since metric is so easy to use...
a litre is 1000mls. So there would be 6.2777g/1000 in one ml =
0.0062777 grams
Times 15 mils: 0.0062777 X 15 = 0.0941655 gms
2007-02-06 08:15:13 · answer #6 · answered by waynebudd 6 · 0⤊ 0⤋
Using ratio and proportion set up the problem as shown.
6.2777g ....... x (mg)
----------- = -------
1L ............. 15ml
Convert into common units; how many ml in a L or vice versa.
Cross multiply.
(ignore the dots, I used those for spacing since Yahoo deletes extra spaces).
2007-02-06 08:14:54 · answer #7 · answered by Imagineer 3 · 0⤊ 0⤋
convert the amount of NaCl to g/ml, then mult by 15
2007-02-06 08:14:22 · answer #8 · answered by JeffJeffSon 2 · 0⤊ 0⤋
About 93.89mg
Working:
1 mole NaCl = 58.5g
? moles = 6.2777g
6.2777/58.8 = 0.107 moles
You then say that:
0.107 moles are in 1000mL
? moles in 15mL
(15 x 0.107) / 1000 = 0.001605 moles
You then say that:
1 mole NaCl = 58.5g
0.001605 moles = ?
0.001605 x 58.5 = 0.09389g which is equal to 93.89 mg
2007-02-06 08:20:24 · answer #9 · answered by caribbeanbluesky 2 · 0⤊ 1⤋
941.655 mg
2007-02-06 08:14:06 · answer #10 · answered by Anonymous · 0⤊ 1⤋