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Cerrena [4.2K]
4 years ago
5

Please help answer this question correctly. My life depends on it!

Chemistry
1 answer:
aleksklad [387]4 years ago
3 0

Answer:

I looked it up so the answer is for sure A

Explanation:

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An aqueous nacl solution is made using 112 g of nacl diluted to a total solution volume of 1.00 l. calculate the molarity, molal
worty [1.4K]
Q1)
molarity is defined as the number of moles of solute in 1 L of solution.
the NaCl solution volume is 1.00 L
number of moles NaCl  = NaCl mass present / molar mass of NaCl 
NaCl moles = 112 g / 58.5 g/mol = 1.91 mol 
the number of moles of NaCl in 1.00 L of solution is - 1.91 mol 
therefore molarity of NaCl is 1.91 M

Q2) 
molality is defined as the number of moles of solute in 1 kg of solvent.
density is mass per volume. 
density of the solution is 1.08 g/mL. 
therefore mass of the solution is = density x volume 
mass = 1.08 g/mL x 1000 mL = 1080 g
since we have to find the moles in 1 kg of solvent 
mass of solvent = 1080 g - 112 g = 968 g
number of moles of NaCl in 968 g of solvent - 1.91 mol 
therefore number of NaCl moles in 1000 g - (1.91 mol / 968 g) x 1000 g/kg = 1.97 mol/kg
molality of NaCl solution is 1.97 mol/kg


Q3) 
mass percentage is the percentage of mass of solute by total mass of the solution 
mass percentage of solution = mass of solute / total mass of the solution 
mass of solute = 112 g
total mass of solution = 1080 g
mass % of NaCl = 112 g / 1080 g x 100%
therefore mass % of NaCl = 10.4 %
answer is 10.4 %
5 0
3 years ago
The gas in a balloon occupies 2.25 L at 298 K and 300 kPa. At
o-na [289]

If a gas in a balloon occupies 2.25 L at 298 K and 300 kPa, the temperature at which the balloon expand to 3.50L and 2.17 atm is 345.23K.

<h3>How to calculate temperature?</h3>

The temperature of an ideal gas can be calculated using the following formula:

P1V1/T1 = P2V2/T2

Where;

  • P1 = initial pressure
  • P2 = final pressure
  • V1 = initial volume
  • V2 = final volume
  • T1 = initial temperature
  • T2 = final temperature

According to the information given in this question;

  • P1 = 300kpa = 2.96 atm
  • P2 = 2.17 atm
  • V1 = 2.25L
  • V2 = 3.50L
  • T1 = 298K
  • T2 = ?

2.96 × 2.25/298 = 2.17 × 3.5/T2

0.022T2 = 7.595

T2 = 7.595 ÷ 0.022

T2 = 345.23K

Therefore, if a gas in a balloon occupies 2.25 L at 298 K and 300 kPa. the temperature at which the balloon expand to 3.50L and 2.17 atm is 345.23K.

Learn more about temperature at: brainly.com/question/11464844

5 0
2 years ago
What is a mole? in your own words. <br> (6.02x10^23)
Luda [366]

Answer:

Like all units, a mole has to be based on something reproducible. A mole is the quantity of anything that has the same number of particles found in 12.000 grams of carbon-12. That number of particles is Avogadro's Number, which is roughly 6.02x1023. 1  A mole of carbon atoms is 6.02x1023 carbon atoms

Explanation:

7 0
3 years ago
While setting up a beaker to boil a solution on a hot plate, you notice that the stirring is erratic and unstable. What should y
Mama L [17]

Given what we know about lab safety, we can confirm that when dealing with unstable and erratic equipment such as the stirring mechanism, in this case, the best course of action is to deactivate the equipment until further notice.

<h3>Why should we turn off the equipment?</h3>
  • The erratic nature of the stirring mechanism is making the entire system unstable.
  • When dealing with a hot plate, and heating substances, we need to maintain stability at all times.
  • We do this to avoid spills that may cause burns or other unwanted damages.
  • Therefore, until we know why the stirring was erratic, we must turn the mechanism off.

Therefore, we can confirm that when dealing with faulty or unstable lab equipment, we must deactivate the equipment immediately in order to preserve our lab safety.

To learn more about lab safety visit:

brainly.com/question/20103808?referrer=searchResults

3 0
3 years ago
Which substance can be decomposed by a chemical change?
11111nata11111 [884]
The answer to this question would be: ammonia
Chemical decomposition is the breakdown of a compound into smaller compound or element. In this question, the Sodium(Na), Argon (Ar) and Sulfur(S) is elements, not compounds.
An element should not breakable since it was the simplest form.
Ammonia(NH3) is a compound so it should be able to be decomposed.
7 0
3 years ago
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