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NARA [144]
3 years ago
12

Which solution will have a higher boiling point: A solution containing 15 grams of sucrose (C12H22O11) in 25 grams of water or a

solution containing 35 grams of sodium chloride in 500 grams of water?
Chemistry
1 answer:
Angelina_Jolie [31]3 years ago
5 0
A solute rises the boiling point of a solution, in direct relation with the number of particles added to the solution. Sucrose remains a molecule, does not separate into anything. NaCl gives Na+ + Cl-. 

<span>Molar mass of sucrose is 12*12+22*1+11*16=144+22+176=342 </span>

<span>105g sucrose is 105/342=0.3moles ---> 0.3 moles of particles (molecules) </span>

<span>Molar mass of NaCl is 23+35.5=58.5 </span>

<span>35 grams of NaCl is 35/58.5=0.598 ----->0.598*2=1.1974 moles of particles (ions, Na+ and Cl-) </span>

<span>So, 35 grams of sodium chloride in 500 grams of water will have a higher boiling point</span>
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For the answer to the question above asking what mass will the balance report for the cylinder of iron if a <span>cylinder of iron has a mass of 23.45 g. If it is placed on an electronic balance that reports all masses 18.00% too low due to miscalibration,
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Using an electronic analytical balance of graduated cylinder.
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3 years ago
A sample of gas has an intial volume of 22.8 L at a pressure of 1.65 atm. If the sample is compressed to a volume of 10.7 L, wha
almond37 [142]

 The  pressure  of the  gas  is 3.52 atm


<u><em>calculation</em></u>

This is calculated using the Boyle's  law  formula

that is  P1V1= P2V2  where;

P1 = 1.65   atm

V1 =22.8 L

P2 =? atm

V2  = 10.7 L


make P2 the subject of the formula by  dividing    both side by V2

P2 = P1V1 / V2

P2 = (1.65 atm x 22.8 l) / 10.7 L  =  3.52   atm

4 0
3 years ago
Why does temperature stay constant during a phase change?
Serjik [45]
When a solid is heated , the average kinetic e energy of the substance increases because of which the temperature increases....this heat won’t affect the average kinetic energy of the substance. Since average kinetic energy will remain same during phase change , the temperature will remain same too.
***HOPE THIS HELP YOU***
4 0
3 years ago
Read 2 more answers
What change would most likely decrease the rate of a chemical reaction? A) maintaining a temperature close to room temperature B
Nutka1998 [239]

Answer:

D) cooling of the reaction mixture

Explanation:

Increase in temperature speedens the rate of a chemical reaction

5 0
3 years ago
Which direction will the following reaction (in a 5.0 L flask) proceed if the pressure of CO_2(g) is 1.0 atm? CaCO_3(s) rightarr
storchak [24]

Answer:

d. To the left because Q > K_p

Explanation:

Hello,

In this case, for the given reaction:

CaCO_3(s) \rightarrow CaO(s) + CO_2(g)

The pressure-based equilibrium expression is:

Kp=p_{CO_2}

In such a way, since Kp is given we rather compute the reaction quotient at the specificed pressure of carbon dioxide as shown below:

Q=p_{CO2}=1.0

Therefore, since Q>Kp we can see that there are more products than reactants, which means that the reaction must shift leftwards towards the reactants in order to reestablish equilibrium, thus, answer is d. To the left because Q > Kp.

Regards.

6 0
3 years ago
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