How many grams of sodium hydroxide are needed to make 500mLs of a 0.125M NaOH solution?

1 answer:

7 0

need 0.500 x 0.125 = 0.0625 moles of NaOH. The molecular weight is 23+16+1 = 40, so 0.0625 x 40 = 2.5 grams will do the trick.

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A type of marble has a density of 2.5 grams/marble. A box filled with marbles has a total mass of 300 grams determine the number

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Answer:

100

Explanation:

Step 1: Subtract 50 by 300 to find the total mass of the marbles

300 - 50 = 250

Not hard, right?

Step 2: Divide 250 by 2.5

250 ÷ 2.5 = 100

And... 100 is your answer :)

Hope this helps :)

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