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VashaNatasha [74]
3 years ago
8

A sample of gas occupies 115.9 mL at -206.6°C. What volume does the sample occupy at 175.9 °C?

Chemistry
1 answer:
aniked [119]3 years ago
3 0
Charles law gives the relationship between volume of gas and temperature.
It states that for a fixed amount of gas at constant pressure, volume of gas is directly proportional to the temperature.
\frac{V}{T} = k

where V - volume and T - temperature and k - constant 
\frac{V1}{T1} =  \frac{V2}{T2}
where parameters for the first instance are on the left side and parameters for the second instance are on the right side of the equation
T1 - temperature in Kelvin , -206.6 °C + 273.15 = 66.55 K
T2 - 175.9 °C + 273.15 = 449.05 K
substituting the values in the equation 
\frac{115.9 mL}{66.55 K} =  \frac{V}{449.05 K}
V = 782 mL
the new volume is 782 mL
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How many grams of copper (II) fluoride, CuF2, are needed to make 5.1 liters of a 1.4M solution?
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Explanation:

Volume of solution (v) = 5.1 liters

Concentration of solution (c) = 1.4M

Amount of CuF2 needed (n) = ?

Since concentration (c) is obtained by dividing the amount of solute dissolved by the volume of solvent, hence

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make n the subject formula

n = c x v

n = 1.4M x 5.1 Liters

n = 7.14 moles

Since, 7.14 moles of CuF2 (n) is needed, use the molar mass of CuF2 to get the mass in grams.

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So, I CuF2 = 63.5g + (19g x 2)

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Then, apply the formula

Number of moles = mass in grams / molar mass

7.14 moles = m / 101.5 g/mol

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m = 724.71g

Thus, 724.71 grams of copper (II) fluoride, CuF2, are needed to make 5.1 liters of a 1.4M solution

7 0
4 years ago
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B

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This tells us that the mass of reactants must be equal to the product mass.

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therefore two atoms each f zinc and sulfur will product two molecules of Zn sulfide

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