An mL is also equivalent to cm³, signifying that 140 mL is equivalent to 140 cm³. The mass of ethanol is calculated by multiplying the density by the volume.
mass = (140 cm³)(0.789 g/cm³)
mass = 110.46 g
Then, calculate the number of moles of ethanol by dividing the mass by the molar mass of ethanol equal to 46.07 g/mol.
number of moles = (110.46 g/ 46.07 g/mol) = 2.4 mol
Then, multiply the number of moles by the Avogadro's number.
2.4 mol (6.022 x 10²³)
<em> number of molecules = 1.445 x 10²⁴</em>
2.61 kilojoules of heat would be liberated by the condensation of 5.00 g of acetone
Explanation:
To convert grams into moles
![moles = grams \times \frac{1 mole}{grams}](https://tex.z-dn.net/?f=moles%20%3D%20grams%20%5Ctimes%20%5Cfrac%7B1%20mole%7D%7Bgrams%7D)
We have 5.00 g acetone
![moles = 5 \times \frac{1}{58.1}](https://tex.z-dn.net/?f=moles%20%3D%205%20%5Ctimes%20%5Cfrac%7B1%7D%7B58.1%7D)
![moles = 0.0861](https://tex.z-dn.net/?f=moles%20%3D%200.0861)
Heat liberated = moles
heat of vapourization
=0.0861 mol x 30.3 kJ/mol
= 2.61 kJ
Therefore, 2.61 kilojoules of heat would be liberated by the condensation of 5.00 g of acetone
Answer:
The temperature at which the glass vessel shatter is = 341.33°c
Explanation:
Initial temperature
= 18 °c = 291 K
Initial Pressure
= 0.9 atm
Final pressure
= 1.9 atm
From ideal gas equation
P V = m R T
Here volume & mass & gas constant is constant so Pressure is directly proportional to the temperature.
![\frac{P_{2} }{P_{1} } = \frac{T_2}{T_1}](https://tex.z-dn.net/?f=%5Cfrac%7BP_%7B2%7D%20%7D%7BP_%7B1%7D%20%7D%20%3D%20%5Cfrac%7BT_2%7D%7BT_1%7D)
![\frac{1.9}{0.9} = \frac{T_2}{291}](https://tex.z-dn.net/?f=%5Cfrac%7B1.9%7D%7B0.9%7D%20%3D%20%5Cfrac%7BT_2%7D%7B291%7D)
= 613.33 K = 341.33°c
Therefore the temperature at which the glass vessel shatter is = 341.33°c
Part 1: Potassium, and Rubidium.Part 2: Calcium has 20 protons and 20 electrons because the atomic number for calcium is 20 and that determines how many protons there are and in an atom, the number of protons is the same number of electrons. Calcium has about 20 neutrons. I got the number of Neutrons by subtracting the mass number(40.078) and the atomic number(20), I got 20.078. Round to the nearest whole number because you cannot have half or partial neutron. So, Calcium has 20 protons, 20 electrons, and 20 neutrons,
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