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fiasKO [112]
3 years ago
11

Which of the following is a vapor? steamhidrógen oxygen helium​

Chemistry
1 answer:
Scrat [10]3 years ago
7 0
Helium bc when u vape it goes into it lungs but also bringing helium at the same time.
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The heat of vaporization ΔHv of dichloromethane CH2Cl2 is 28.0 /kJmol . Calculate the change in entropy ΔS when 3.3g of dichloro
ella [17]

Answer:

\Delta _VS=3.48x10^{-3}kJ=3.48J

Explanation:

Hello,

In this case, the change in the entropy, by knowing the change in the enthalpy and the temperature for a vaporization process is given by:

\Delta _VS=\frac{\Delta _VH}{T_V}

Thus, we start by computing the change in the enthalpy for the 3.3g of dichloromethane  as shown below:

\Delta _VH=3.3gCH_2Cl_2 *\frac{1molCH_2Cl_2}{84.9gCH_2Cl_2}*28\frac{kJ}{molCH_2Cl_2} =1.09kJ

Finally, the change in the entropy, considering the temperature in kelvins:

\Delta _VS=\frac{1.09kJ}{(39.8+273.15)K}\\\\\Delta _VS=3.48x10^{-3}kJ=3.48J

Best regards.

5 0
3 years ago
As the organsims develops, its cells become -------
exis [7]
It's cells become larger in numbers.
3 0
4 years ago
Nylon is a synthetic material that has many uses. It is used in the production of machine parts, cookware, and fabric. Nylon is
ch4aika [34]

In case of a shortage in petroleum and natural gas, a company should find a way to make nylon without using natural resources.

Nylon is a very important material used in numerous applications. As a result of this, the demand for nylon as a raw material has genuinely been on the high side ever since.

However, nylon production depends on petroleum and natural gas. It is possible that there could be a shortage of these resources since they are obtained from the environment. In such cases, a company should  find a way to make nylon without using natural resources.

Learn more about polymers: brainly.com/question/17555341

5 0
3 years ago
Read 2 more answers
Water interacts with polar substances like –OH groups but not with non-polar substances like methyl (-CH3) or ethyl groups (-CH2
Otrada [13]
To answer this, we look at the polarities of these molecules given. A molecule is said to be polar when there is an unequal shraing of electrons the opposite is called nonpolar.
CH4 = nonpolar
CH3OH = polar
CH3 CH3 = nonpolar
CH3 CH2 CH2 OH = polar
<span>CH3 CH2 CH2 CH2 CH2 CH3 = nonpolar</span>
3 0
3 years ago
To make a 450g solution with a mass by mass concentration of 7%, how much salt and water do you need to mix?​
Yuri [45]

Explanation:

The given data is:

The mass% of a solution is 7.

Mass of solution =450g

The mass of salt required can be calculated as shown below:

mass percent =(mass of solute/mass of solution )x100\\

Substitute the given values in this formula to get the mass of solute that is salt:

mass percent =(mass of solute/mass of solution )x100\\\\7=\frac{mass of salt}{450g} x100\\=>mass of salt=7x450g /100\\mass of salt=31.5g

Mass of salt =31.5g

Mass of solvent that is water = 450g-31.5g=418.5g

4 0
3 years ago
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