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Rashid [163]
2 years ago
9

Select the two chemical reactions that adhere to the law of conservation of matter.

Chemistry
1 answer:
rodikova [14]2 years ago
6 0

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Solid

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Complete this example: A 0.67 molal solution was
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A then C

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What might happen if we heat the sphere
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The freezing point of 42.19 g of a pure solvent is measured to be 43.17 ºC. When 2.03 g of an unknown solute (assume the van 't
vovikov84 [41]

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The molality of the solution is 0.3716 mol/kg

The number of moles of solute is 0.0157 mol

The molecular weight of the solute is 129.30 g/mol

The molar mass of the solute is 129.32 g/mol

Explanation:

m (molality of the solution) = ∆T/Kf = (43.17 - 40.32)/7.67 = 0.3716 mol/kg

Number of moles of solute = molality × mass of solvent in kilogram = 0.3716 × 0.04219 = 0.0157 mol

Molecular weight of solute = mass/number of moles = 2.03/0.0157 = 129.3 g/mol

When Kf = 7.66 °C.kg/mol

Molar mass = 2.03 ÷ (2.85/7.66 × 0.04219) = 129.32 g/mol

4 0
3 years ago
12 Chlorine gas is bubbled into aqueous potassium iodide.
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the answer is a because the positive cations are attracted to the negative cathode. when the positive ions get to the cathode they pick up an electron and this produces normal sodium.

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