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swat32
2 years ago
5

A supersaturated solution can be prepared by dissolving solute in solvent while adding ______. A supersaturated solution contain

s more ______ than can ordinarily be dissolved in the solvent at room temperature. A solution may remain supersaturated until _______ is initiated, often by adding solid to the solution or by allowing solvent to evaporate.
Chemistry
1 answer:
Delicious77 [7]2 years ago
4 0

Answer:

Heat, solutes and high temperature.

Explanation:

A supersaturated solution can be formed by dissolving solute more solute in solvent by increasing temperature of the solution. A supersaturated solution contains more quantity of solutes than can be dissolved in the solvent at room temperature. A solution may remain supersaturated until the solution has high temperature and when the temperature started lower, the extra dissolve solutes begin undissolved and remain suspended in the solution.

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Phosphorus has the molecular formula p4, and sulfur has the molecular formula s8. how many grams of phosphorus contain the same
Alinara [238K]
1) Find the number of molecules in 7.88 g of sulfur

molar mass of S8 = 8*atomic mass of S = 8 * 32.0 g / mol = 256.0 g/mol

Number of moles  = mass in grams / atomic mass = 7.88 g / 256.0 g / mol = 0.0308 moles

2) Find the mass of 0.0308 moles of P4

mass = number of moles * molar mass

molar mass of P4 = 4 * atomic mass of P = 4 * 31 g/mol = 124 g/mol

mass of P4 = 0.0308 moles * 124 g/mol = 3.8192g ≈ 3.82 g.

Answer: 3.82 grams of P4 will have the same number of molecules as 7.88 g of S8 (that is 0.0308 moles of molecules)
6 0
2 years ago
Consider the following properties: I) The red color of rubies is due to the presence of chromium ions. II) Objects made of silve
Alenkinab [10]

Answer:

Only II) is correct

Explanation:

I) The red color of the rubies is a physical property of its own structure (wich contains  chromium ions)

II)Objects made of silver become tarnished not by a physical property, but as the result of a chemical reaction on the surface of the object made of silver in combination with the sulfur in the air

2Ag_{(s)}+S\rightarrow Ag_{2}S

This changes the color of the object to black, (similar to the iron oxidation)

iii)Boiling is a physical change where a liquid substance absorbs heat in some way (e.g. a flame) and becomes a gas

6 0
2 years ago
How many molecules of CaCl2 are equivalent to 75.9g CaCl2 (Ca=40.08g/mol, CL=35.45g/mol)
melomori [17]

Answer:

\large \boxed{4.12 \times 10^{23}\text{ formula unis of CaCl}_{2}}$}

Explanation:

You must calculate the moles of CaCl₂, then convert to formula units of CaCl₂.

1. Molar mass of CaCl₂

CaCl₂ = 40.08 + 2×35.45 = 40.08 + 70.90 = 110.98 g/mol

2. Moles of CaCl₂ \text{Moles of CaCl}_{2} = \text{75.9 g CaCl}_{2} \times \dfrac{\text{1 mol CaCl}_{2}}{\text{110.98 g CaCl}_{2}} = \text{0.6839 mol CaCl}_{2}

3. Formula units of CaCl₂

\text{No. of formula units} = \text{0.6839 mol CaCl}_{2} \times \dfrac{6.022 \times 10^{23}\text{ molecules CaCl}_{2}}{\text{1 mol P$_{2}$O}_{5}}\\\\= \mathbf{4.12 \times 10^{23}}\textbf{ formula units CaCl}_{2}\\\text{There are $\large \boxed{\mathbf{4.12 \times 10^{23}}\textbf{ formula units of CaCl}_{2}}$}

7 0
2 years ago
Calculate the change in entropy that occurs in the system when 2.70 mole of diethyl ether (C4H6O) condenses from a gas to a liqu
AlladinOne [14]

Answer:233 Joules/K

Explanation:

∆H= 26.5KJmol-1

Kelvin temperature = 34.6 + 273 = 307.6 K

No of moles= 2.7 moles

2.70 mole x 26.5 kJ/mole = 71.55kilojoules

∆S=71.55 kilojoules / 307.6 K = 0.233 kilojoules/ K

Convert to JK-1

0.233 kilojoules/ K x 1000 Joules/kilojoule = 233 Joules/K

5 0
2 years ago
The density of gold is 19.3 g/ml. what is the volume of a gold nugget that weighs 93.5 g?
user100 [1]
So each 19.3g of gold is equivalent to one ml

So if we divide the mass of the gold nugget by the density we can find the volume: 93.5/19.3 = 4.79ml 

Hope that helps 
4 0
2 years ago
Read 2 more answers
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