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3 years ago

A. 1.0 liter of a 1.0 M mercury (II) chloride (HgCl2) solution IMO)

Chemistry

1 answer:

insens350 [35]3 years ago

4 0

What mass of the following chemicals is needed to make the solutions indicated?

Answer:

271.6g

Explanation:

The mass of the chemicals need to make the needed solution can be derived by obtaining the number of moles first.

Given parameters:

Volume of solution = 1L

Molarity of HgCl₂ = 1M

number of moles of HgCl₂ = molarity of solution x volume

= 1 x 1

= 1 mole

From;

Mass of a substance = number of moles x molar mass;

we can find mass;

Molar mass of HgCl₂ = 200.6 + 2(35.5) = 271.6g/mol

Mass of the substance = 1 x 271.6 = 271.6g

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Mathematically, Molality = $\frac{\text{no. of moles of solute}}{\text{mass of solvent in Kg}}$

The given data is as follows.

Molar mass of ammonia = 17 g/mol

Concentration = 1.002 mg/L = $\frac{0.001002 g/L}{17 g/mol}$

= $5.89 \times 10^{-4}$ mol/L

Also, density = $\frac{1 g}{mL}$ = 1 kg/L

Therefore, molality will be calculated as follows.

Molality = $\frac{5.89 \times 10^{-4} mol/L}{1 kg/L}$

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= $8.956 \times 10^{-6}$ mol/kg

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Also, density = $\frac{1 g}{mL}$ = 1 kg/L

Hence, molality will be calculated as follows.

Molality = $\frac{0.02181 mol/L}{1 kg/L}$

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The wavelength of a particular color of violet light is 433 nm. The energy of this wavelength of light is kJ/photon. (109 nm = 1

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Answer:

4.59 × 10⁻³⁶ kJ/photon

Explanation:

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