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Salsk061 [2.6K]
2 years ago
10

25 g of a chemical is dissolved in 75 g of water. What is the percent by mass concentration of this chemical

Chemistry
1 answer:
Zanzabum2 years ago
4 0

Answer:

300

Explanation:

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What volume of a 0.550 M solution of potassium hydroxide (KOH) can be made with 19.9 g of potassium hydroxide?
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Answer:

0.645 L

Explanation:

To find the volume, you need to (1) convert grams to moles (using the molar mass) and then (2) calculate the volume (using the molarity ratio). The final answer should have 3 sig figs to match the sig figs of the given values.

(Step 1)

Molar Mass (KOH): 39.098 g/mol + 15.998 g/mol + 1.008 g/mol

Molar Mass (KOH): 56.104 g/mol

19.9 grams KOH              1 mole
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(Step 2)

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0.550 M = 0.355 moles / volume                 <----- Insert values

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