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irinina [24]
3 years ago
12

Petunia needs 66.48 grams of potassium hydroxide (KOH) to run a reaction in class. How many moles of potassium hydroxide does sh

e need? Please round your answer to two digits after the decimal point, and remember to include correct, complete units (including substance formula).
Chemistry
1 answer:
Kaylis [27]3 years ago
4 0

Answer:

She needs 1.19 moles of potassium hydroxide.

Explanation:

Being the molar mass of the elements:

  • K= 39 g/mole
  • O= 16 g/mole
  • H= 1 g/mole

then the molar mass of potassium hydroxide is:

KOH= 39 g/mole + 16 g/mole + 1 g/mole= 56 g/mole

Being the mass of one mole of a substance, which can be an element or a compound, you can apply the following rule of three: if 56 g of KOH are present in 1 mole, 66.48 g of KOH in how many moles of the compound are they?

moles of KOH=\frac{66.48 grams*1 mole}{56 grams}

moles of KOH= 1.19

<u><em> She needs 1.19 moles of potassium hydroxide.</em></u>

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