Trường hợp nào sau đây là chất tinh khiết

2 answers:

8 0

Sắt, thép và nước là một số ví dụ về một chất tinh khiết. Không khí có thể là một hỗn hợp đồng nhất thường được coi là một chất tinh khiết. Như chúng ta đã biết kim cương, đường sucrose, mật ong và không khí đều là những chất tinh khiết. Nước tinh khiết có hai nguyên tử hydro và một nguyên tử oxy.

Verdich [7]3 years ago

6 0

Answer:

where????

Explanation:

nasaan yung pag pipilian???

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If the prescribed dosage of milk of magnesia Mg(OH)2 is 3.5 moles, how many grams

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Answer:

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3 years ago

The boiling point of water is 100.0°C at 1 atmosphere. How many grams of sodium acetate (82.04 g/mol), must be dissolved in 283.

Alecsey [184]

Answer:

I have to weight 10,04 g of acetate sodium

Explanation:

This is the colligative propertie about elevation of boiling point

ΔT = Kb . m . i

ΔT is the difference between T° at boiling point of the solution - T° at boiling point of the solvent pure - we have this data 0,450°C

Kb means ebulloscopic constant (0,52 °C.kg/m .- a known value for water)

m means molality (moles of solute in 1kg of solvent)

i means theVan 't Hoff factor (degree of dissociation for a compound)

For the sodium acetate is 2

NaCH3COO ---> Na+ + CH3COO-

0,450°C = 0,52°C.kg/m . m . 2

0,450°C / (0,52°C.kg/m . 2) = m

0,432 m/kg = m

This number means I have 0,432 moles of acetate sodium, my solute in 1kg of water, my solvent. But I don't have 1000 g (1kg) I only have 283 g so let's make the rule of three:

1000 g _____ 0,432 moles

283 g ______ (283g .0,432m) / 1000g = 0,122 moles

Now that I have the moles of acetate sodium, I have to find the mass.

Moles . molar mass = mass

0,122 moles . 82.04 g/mol = 10,04 g

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