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SOVA2 [1]
3 years ago
13

5. How many moles of copper atoms are in 2.5 x 1027 atoms of copper?

Chemistry
1 answer:
OlgaM077 [116]3 years ago
4 0

Answer: The relation between molecular (formula) mass and molar mass Page 4 4 • To obtain one mole of copper atoms (6.02 x 1023 atoms), weigh out 63.55 g copper.

Explanation: shoot what the hec why did i send this

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A chlorine Cl and bromine Br atom are adsorbed on a small patch of surface (see sketch at right). This patch is known to contain
MrRissso [65]

Explanation:

It is given that possible number of ways the Cl and Br can be absorbed initially are 100.

S, possible number of ways by which Br can be desorbed is as follows.

                  100 \times 99

Now, we will calculate the change in entropy as follows.

               \Delta S = k_{B} ln (\frac{W}{W_{o}})

where,   k_{B} = Boltzmann constant = 1.38 \times 10^{-23}

             \Delta S = change in entropy

Therefore, we will calculate the change in entropy as follows.

             \Delta S = k_{B} ln (\frac{W}{W_{o}})

                         = 1.38 \times 10^{-23} J/K \times ln (\frac{100}{100 \times 99})

                        = 1.38 \times 10^{-23} J/K \times -4.595

                        = -6.34 \times 10^{-23} J/K

Thus, we can conclude that the change in entropy is -6.34 \times 10^{-23} J/K.

5 0
3 years ago
To separate a mixture of iron filings and salt, the<br> most efficient method would be
CaHeK987 [17]

Iron filings can be attracted by the magnet whereas salt can not. So the mixture can be separated by a magnet

7 0
4 years ago
Read 2 more answers
Write the reaction rate expressions for the<br> following reactions?<br> 2H2+O2_____2H2O
Nezavi [6.7K]

Answer:

see attachment

Explanation:

3 0
4 years ago
Use the observation in the first column
Lyrx [107]

Answer:

A. Substance E

A. Substance C

A. Substance A  

Explanation:

Given that:

At 4 °C, Substance E has a vapor pressure of 86. torr and Substance F has a vapor pressure of 136. torr

Which has a higher boiling point?

A. Substance E

B. Substance F

C. Neither,EandF have the same boiling point

The vapor pressure varies inversely proportional to the boiling point.

\mathbf{vapor \ pressure \ \ \alpha \  \  \dfrac{1}{boiling \ point}}

Therefore, the lower the vapor pressure, the higher the boiling point.

At 4°C, Substance E with a lower vapor pressure of 86. torr will have a higher boiling point from the given information.

2.

Recall that :

\mathbf{vapor \ pressure  \ \  \alpha  \ \  \dfrac{1}{enthalpy \ of  \  vaporization}}

therefore, the lower the enthalpy of vaporization, the higher the vapor pressure at any given temperature.

Given that:

Substance C has an enthalpy of vaporization smaller than that of substance D. Then, substance C has a higher vapor pressure.

3.

We've earlier said that:

The vapor pressure varies inversely proportional to the boiling point.

\mathbf{vapor \ pressure \ \ \alpha \  \  \dfrac{1}{boiling \ point}}

Therefore, the lower the vapor pressure, the higher the boiling point.

As such, Substance A will have a higher boiling point.

6 0
3 years ago
What is the percent by mass of 54.7g of calcium chloride dissolved in 500g of water?
Advocard [28]
% by mass = (mass solute/mass solution)*100%
mass  of the solute = 54.7 g
mass of the solution = mass solute + mass solvent=54.7+500=554.7 g
% by mass = (54.7/554.7)*100%≈0.0986*100% = 9.86%

3 0
4 years ago
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