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4 years ago

A pencil is 16.2 cm long. What is its length in inches?

Chemistry

2 answers:

umka2103 [35]4 years ago

3 0

1 cm = 0.39 inches so we can just 16.2*0.39 and we will get 6.38 inches.

kondaur [170]4 years ago

3 0

A pencil is 16.2 cm long. 6.318 is its length in inches.

<u>Explanation:</u>

First we need to know the formula for centimetres to the inches conversion

Its formula is:

$[{number of centimetres}] \times 0.39=[\text {number of inches}]$

This above equation clearly means that, by using calculator, you put the number in centimetres that required to convert. Then, multiply them with 0.39 and so you can have the numbers in inches.

1 cm = 0.39 inches (the conversion factor formula)

Given data,

Pencil length = 16.2 cm

Therefore, Length in inches = $16.2 \times 0.39$ = 6.318 inches is the answer.

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What is the freezing point of a solution in which 2.50 grams of sodium chloride are added to 230.0 ml of water

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The freezing point of a solution in which 2.5 grams of NaCl is added t0 230 ml of water is : - 0.69°C

<h3>Determine the freezing point of the solution </h3>

First step : Calculate the molality of NaCl

molality = ( 2.5 grams / 58.44 g/mol ) / ( 230 * 10⁻³ kg/ml )

= 0.186 mol/kg

Next step : Calculate freezing point depression temperature

T = 2 * 0.186 * kf

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Hence; T = 2 * 0.186 * 1.86 = 0.69°C

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Hence the Freezing temperature of the solution is - 0.69°C

Learn more about The freezing point of a solution in which 2.5 grams of NaCl is added t0 230 ml of water is : - 0.69°C

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