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Setler [38]
3 years ago
14

AGHHHHHH SOMEONE HELP MEEEEEEEEEEE I WILL RATE BRAINLIEST IF SOMEONE JUST HELPS MEEEEE

Chemistry
1 answer:
sergejj [24]3 years ago
6 0
I would say the third one.
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What is The temperature at which a substance changes from a liquid to a gas
Rainbow [258]
The melting point for ice is at 32 degrees <span>Fahrenheit or O degrees Celsius.</span>
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Why do you use 6.02*10^23 here?? #21???
almond37 [142]
6.02*10^23 is Avagadro's number representing the number of molecules per mole of substance.
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2 years ago
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Describe the quantitative characteristics of all chemical reactions. Explain how we can use these features to make quantitative
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Answer Chemical reaction quantitatively depend on the reactant and product molecule
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2 years ago
What is the concentration of an alcl3 solution if 150. ml of the solution contains 550. mg of cl- ion?
valina [46]

The concentration of AlCl3 solution if 150 ml of the solution contains 550 mg of cl- ion is 0.0344 M


calculation


concentration = moles /volume in liters


volume in liters = 150 /1000= 0.15 L


number of moles calculation

write the equation for dissociation of Al2Cl3

that is AlCl3 ⇔ Al^3+ + 3 Cl ^-


find the moles of Cl^- formed

moles =mass/molar mass

mass in grams= 550/ 1000 =0.55 grams

molar mass of Cl^- =35.5 g/mol


moles is therefore= 0.55/35.5 =0.0155 moles


by use of mole ration betweem AlCl3 to Cl^- which is 1:3 the moles of AlCl3 is =0.0155 x 1/3= 5.167 x10^-3 moles



concentration of AlCl3 is therefore= 5.167 x10^-3/ 0.15 =0.0344 M

6 0
3 years ago
A solution is prepared by mixing 25.0 g H2O and 25.0 g C2H5OH. Determine the mole fractions of each substance.
Veronika [31]

Answer:

Mole fraction H₂O → 0.72

Mole fraction C₂H₅OH → 0.28

Explanation:

By the mass of the two elements in the solution, we determine the moles of each:

25 g . 1 mol/ 18g = 1.39 moles of water (solute)

25 g . 1 mol / 46 g = 0.543 moles of ethanol (solvent)

Mole fraction solute = Moles of solute / Total moles

Mole fraction solvent = Moles of solvent / Total moles

Total moles = Moles of solute + Moles of solvent

1.39 moles of solute + 0.543 moles of solvent = 1.933 moles → Total moles

Mole fraction H₂O = 1.39 / 1.933 → 0.72

Mole fraction C₂H₅OH= 0.543 / 1.933 → 0.28

Remember that sum of mole fractions = 1

8 0
2 years ago
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