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Soloha48 [4]
3 years ago
10

What is the concentration (m) of ch3oh in a solution prepared by dissolving 12.9 g of ch3oh in sufficient water to give exactly

230 ml of solution?
Chemistry
1 answer:
Alexxandr [17]3 years ago
5 0

Concentration (m) signify 'molality'

Concentration (M) signify 'Molarity'

Formula for molality (m) = \frac{Moles of solute}{Mass of solvent in Kg}

In the question denisty of solute is not given so we can calculate concentration (M) that is 'Molarity'

Molarity (M) = \frac{Moles of solute}{Volume of solution in L}

Moles of solute CH3OH = Given grams / Molar mass of CH3OH

Given grams of CH3OH = 12.9 g and molar mass = 32.0 g/mol

Moles of solute CH3OH = 12.9 g\times \frac{1mol}{32.0g}

Moles of solute CH3OH = 0.403 mol

Volume of solution = 230 mL , we need to convert 230 mL to 'L'

Volume = 230 mL\times \frac{1 L}{1000 mL}

Volume = 0.23 L

Molarity (M) = \frac{0.403mol}{0.23L}

Concentration (M) = 1.75 mol / L or 1.75 M

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Explain how mass and energy are conserved when water evaporates.
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ionic compounds are made from metal and non mental elements

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in this case it is know as an ionic compound because it contains a charge. For example, NaCl is simply a compound as it contains no charges (the charges cancel out as Cl is -1 and Na is +1)

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1.) Which of the following is an example of using creativity while doing background research?
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A rectangular block has the following dimensions: 3.21 dm, 5.83 cm, and 1.84 in. The block has a mass of 1.94 kg. What is the de
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The density of the rectangular block in g/mL is 7.0.

<u>Given the following data:</u>

  • Mass of block = 22.8 gra1.94 kg
  • Length of block = 3.21 cm
  • Width of block = 5.83 cm
  • Height of block = 1.84 in.

To find the density of the block in g/mL:

First of all, we would determine the volume of the rectangular block by using the following formula:

Volume = length × width × height

<u>Conversion:</u>

1 in = 2.54 cm​

5.83 in = X cm

Cross-multiplying, we have:

X = 2.54(5.83)\\\\X = 14.81 \; cm

Volume = 3.21 × 5.83 × 14.81

Volume = 277.16 cubic centimeters.

<u>Note</u>: Milliliter (mL) is the same as cubic centimeters.

1000 grams = 1 kg

Y grams = 1.94 kg

Cross-multiplying, we have:

Y = 1940 grams

Now, we can find the density:

Density = \frac{Mass}{Volume}\\\\Density = \frac{1940}{277.16}

<em>Density </em><em>= 7</em><em>.0 g/mL</em>

Therefore, the density of the rectangular block in g/mL is 7.0.

Read more: brainly.com/question/18320053

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