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serg [7]
1 year ago
13

A solution is made by dissolving 42.3g of potassium hydroxide in 329g of water what is the molality of the solution?

Chemistry
1 answer:
xxMikexx [17]1 year ago
7 0

Answer:

2.34 molality

Explanation:

Mole weight of KOH ( using periodic table ...rounded to 3 s.f.) =

              56.1 gm/mole

Number of moles in 43.2 g

  43.2 g  /  56.1 gm / mole =.770 mole

molality = .770 mole / .329 kg = 2.34 m

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Answer:

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(B.)

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A water bottle has a mass of 14.0g. Given a density of 1.38g/cm^3, what is the volume of the plastic used to make the water bott
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Answer:

\boxed{\sf Volume \ of \ plastic \ used = 10.14 \ cm^3}

Given:

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\boxed{ \bold{Density \ (\rho) = \frac{Mass \ (m)}{Volume \ (V)}}}

Substituting value of m & density in the formula:

\sf \implies 1.38 =  \frac{14.0}{V} \\  \\   \sf \implies V =  \frac{14.0}{1.38} \\  \\   \sf \implies V = 10.14 \ cm^3

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6 0
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The microscopes used today are just like the ones used by Leeuwenhoek and Hooke. True or false
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False

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2 years ago
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