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Stella [2.4K]
4 years ago
7

3. Burns from boiling water can be severe, caused by the transfer of energy from the boiling water to the

Chemistry
1 answer:
Free_Kalibri [48]4 years ago
8 0

Answer:

Q = 3937.56  J

Explanation:

Heat transferred due to change in temperature is given by :

Q=mc\Delta T

c is the specific heat of water, c=4.18 J/g-°C

We have, m = 15 g, T_i=100^{\circ} C\ \text{and}\ T_f=37.2^{\circ} C

So,

Q=15\times 4.18\times (37.2-100)\\Q=-3937.56\ J

Hence, 3937.56  J of heat is transferred.

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The vapor pressure of liquid acetone, CH3COCH3, is 100 mm Hg at 281 K. A 6.06E-2 g sample of liquid CH3COCH3 is placed in a clos
Lynna [10]

Explanation:

According to ideal gas equation, product of pressure and volume equals the product of number of moles, gas constant and temperature.

Mathematically,     PV = nRT

where          P = pressure,               V = volume

                  n = no. of moles,         R = gas constant = 0.0821 atm L/mol

                   T = temperature

Since, it is known that number of moles equal mass divided by molar mass.

Hence, number of moles of given sample of acetone are as follows.

              No. of moles = \frac{mass}{\text{molar mass of acetone}}

                                    =  \frac{6.06 \times 10^{-2}}{58 g/mol}

                                    = 0.104 \times 10^{-2} mole

Therefore, putting the values in ideal gas equation as follows.

                         PV = nRT

P \times 0.36 L = 0.104 \times 10^{-2} \times 0.082 atm L/mol \times 281 K

                           = 0.359 atm

In 1 atm equal to 760 mm Hg. So, convert 0.359 atm into mm Hg as follows.

                  0.359 atm \times \frac{760 mm Hg}{1 atm}

                       = 272.84 mm Hg

Hence, pressure of the ideal gas will be 100 mm Hg + 272.84 mm Hg = 372.84 mm Hg

Thus, we can conclude that the ideal gas pressure in the container if all of the liquid acetone evaporated is 372.84 mm Hg.

6 0
4 years ago
Solution a is 2 mmol/l urea, and solution b is 1mmol/l nacl. assume that g nacl = 1.85. are the 2 solutions isosmotic?
zavuch27 [327]
Soution A has a higher osmolarity than solution B and is hyperosmotic.
Solution be is hyposmotic.  Neither are isosmotic.
8 0
4 years ago
I have asked this already!!!!!
stellarik [79]

Answer:

01) Cu tting hair is a physical change. reason-1

02) Cooking can be either one, but I would choose chemical reason-3

03) Ice cream melting is a physical change reason-2

Explanation:

6 0
3 years ago
If you combine 27.1 g of a solute that has a molar mass of 27.1 g/mol with 100.0 g of a solvent, what is the molality of the res
baherus [9]

<u>Answer:</u> The molality of the solution is 0.1 m.

<u>Explanation:</u>

To calculate the molality of solution, we use the equation:

Molality=\frac{m_{solute}\times 1000}{M_{solute}\times W_{solvent}\text{ in grams}}

Where,

m_{solute} = Given mass of solute = 27.1 g

M_{solute} = Molar mass of solute = 27.1 g/mol

W_{solvent} = Mass of solvent = 100 g

Putting values in above equation, we get:

\text{Molality of solution}=\frac{27.1\times 1000}{27.1\times 100}\\\\\text{Molality of solution}=0.1m

Hence, the molality of the solution is 0.1 m.

8 0
3 years ago
Read 2 more answers
What is the difference between a scientific thenry and a scientific law?
ryzh [129]

Answer:

Scientific theories are still to be proven while as scientific laws are already proven.

4 0
3 years ago
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