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monitta
3 years ago
11

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:
Marysya12 [62]3 years ago
4 0

Answer:

1.19mole

Explanation:

Given parameters:

Mass of potassium hydroxide , KOH  = 66.48g

Unknown:

Number of moles of KOH = ?

Solution:

To solve this problem, we need to use the expression below;

   Number of moles  = \frac{mass}{molar mass}  

Molar mass of KOH = 39 + 16 + 1  = 56g/mol

  Number of moles  = \frac{66.48}{56}   = 1.19mole

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lana [24]

Answer:

The answer to your question is 24.32 g

Explanation:

Data

Atomic weight = ?

HCl volume = 125 ml

Molarity = 0.2

mass of metal = 0.304 g

Balanced chemical equation

                       M + 2HCl   ⇒  MCl₂  +  H₂

Process

1.- Calculate the moles of HCl

Molarity = moles / volume (L)

- Solve for moles

  moles = Molarity  x volume

  moles = 0.2 x 0.125

             = 0.025

2.- Calculate the moles of the Metal

                1 mol of M ----------------- 2 moles of HCl

                x                ----------------- 0.025 moles of HCl

                x = (0.025 x 1) / 2

                x = 0.0125 moles of HCl

3.- Calculate the atomic weight of the metal

                atomic weight ---------------- 1 mol

               0.304 g             ---------------0.0125 moles

               Atomic weight = (1 x 0.304) / 0.0125

               Atomic weight = 24.32 g    

             

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What is the mass of 5.35×1021 platinum atoms?
inysia [295]
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kondor19780726 [428]

Answer:

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