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ludmilkaskok [199]
3 years ago
13

Match the following numbers with the correct number of significant digits they possess. Answers may repeat. (4 points)

Chemistry
1 answer:
Vanyuwa [196]3 years ago
7 0
I think the answers are
B. 3
A. 4
C. 5
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Benzene has a formula of C6H6 and a vapor pressure of 96.4 torr at 298 K. Toluene has a formula of C7H8 and a vapor pressure of
Slav-nsk [51]

Answer: The vapor pressure of the solution is 55.2 torr

Explanation:

p_1=x_1p_1^0 and p_2=x_2P_2^0

where, x = mole fraction in solution

p^0 = pressure in the pure state

According to Dalton's law, the total pressure is the sum of individual pressures.

p_{total}=p_1+p_2p_{total}=x_Ap_A^0+x_BP_B^0

x = mole fraction = \frac{\text {moles}}{\text {total moles}}

Given : 299 g of toluene and 391 g of benzene.

moles of toluene = \frac{\text{Given mass}}{\text {Molar mass}}=\frac{299g}{92g/mol}=3.25moles

moles of benzene= \frac{\text{Given mass}}{\text {Molar mass}}=\frac{391g}{78g/mol}=5.01moles

Total moles = moles of solute (toluene)  + moles of solvent (benzene) = 3.25 + 5.01 = 8.26

x_{benzene} = mole fraction of benzene =\frac{3.25}{8.26}=0.39

x_{toluene} =mole fraction of toluene = (1-0.39) = 0.61

p_{benzene}^0=96.4torr

p_{toluene}^0=28.9torr

p_{total}=0.39\times 96.4+0.61\times 28.9=55.2torr

Thus the vapor pressure of the solution is 55.5 torr

6 0
4 years ago
Potassium carbonate dissolves as follows:
lara [203]

The 0.25 volume in liters of 1.0 M K_{2}CO_{3} solution is required to provide 0.5 moles of K(aq).

Calculation,

The Potassium carbonate dissolves as follows:

K_{2}CO_{3}(s) → 2K(aq) +CO_{3}^{-2} (aq)

The mole ratio is 1: 2

It means, the 1 mole K_{2}CO_{3} required to form 2 mole of K(aq).

To provide 0.5 mole of K(aq) = 1 mole ×0.5 mole /2 mole required by K_{2}CO_{3}.

To provide 0.5 mole of K(aq) ,0.25 mole required by K_{2}CO_{3}.

The morality of  K_{2}CO_{3} = 1 M = number of moles / volume in lit

The morality of  K_{2}CO_{3} =   1 M = 0.25 mole/ volume in lit

Volume in lit = 0.25 mole / 1 M = 0.25 mole/mole/lit = 0.25 lit

learn about moles

brainly.com/question/26416088

#SPJ4

5 0
3 years ago
Complete the following table based on known properties of ionic and covalent compounds.
TiliK225 [7]

Answer:

structure of KF - ionic

Explanation:

6 0
3 years ago
A sample of 4.0 L of nitrogen, at 1.2 atmospheres, is transferred to a 12 L container.
Zielflug [23.3K]

Answer:

The pressure will be 0.4 atm.

Explanation:

The gas laws are a set of chemical and physical laws that allow determining the behavior of gases in a closed system. The parameters evaluated in these laws are pressure, volume, temperature and moles.

As the volume increases, the gas particles (atoms or molecules) take longer to reach the walls of the container and therefore collide with them less times per unit of time. This means that the pressure will be lower because it represents the frequency of collisions of the gas against the walls. In this way pressure and volume are related, determining Boyle's law which says:

"The volume occupied by a certain gaseous mass at constant temperature is inversely proportional to pressure"

Boyle's law is expressed mathematically as:

P*V= k

If you initially have the gas at a volume V1 and press P1, when the conditions change to a volume V2 and pressure P2, the following is satisfied:

P1*V1= P2*V2

In this case:

  • P1= 1.2 atm
  • V1= 4 L
  • P2= ?
  • V2= 12 L

Replacing:

1.2 atm* 4 L= P2* 12 L

Solving:

P2=\frac{1.2 atm*4 L}{12 L}

P2= 0.4 atm

<u><em>The pressure will be 0.4 atm.</em></u>

7 0
3 years ago
Hydrochloric acid and sodium hydroxide are mixed together to form salt and water. During the reaction, the temperature of the so
sammy [17]
The best answer among the choices is option D. New substances are being formed will best explain that this process is a chemical change. Although, it cannot be seen directly we knew that an acid and base will undergo neutralization reaction forming a salt and water. The heat given off by the reaction can be a parameter however it does not only happens for reactions. It can also happen when dissolving substances.
6 0
3 years ago
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