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Vikentia [17]
4 years ago
13

The combination of the Adams of two or more elements is known as a/an?

Chemistry
1 answer:
Maslowich4 years ago
3 0
The combination of the of two or more elements is known as a compound. 

A homogenous mixture has a uniform composition all throughout. They are similar in terms of the amount of composition present in a solution. For example, oxygen is diatomic, O2. So oxygen is a compound because it has 2 elements combined in it. It is also a homogenous mixture if there are a lot of O2 gases present in let’s say tank. They only differ in the place where they are present. A compound is a representation of one molecule whereas a homogenous mixture is present in a a solution.

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Uranium has 146 neutrons; therefore its mass number is which of the following?
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Explanation:

Let us assume that the given data is as follows.

        V = 3.10 L,        T = 19^{o}C = (19 + 273)K = 292 K

       P = 40 torr    (1 atm = 760 torr)

So,     P = \frac{40 torr}{760 torr} \times 1 atm

             = 0.053 atm

          n = ?

According to the ideal gas equation, PV = nRT.

Putting the given values into the above equation to calculate the value of n as follows.

                 PV = nRT

   0.053 atm \times 3.10 L = n \times 0.0821 L atm/mol K \times 292 K

                 0.1643 = n \times 23.97

                    n = 6.85 \times 10^{-3}

It is known that molar mass of ethanol is 46 g/mol. Hence, calculate its mass as follows.

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

                 6.85 \times 10^{-3} = \frac{mass}{46 g/mol}  

                    mass = 315.1 \times 10^{-3} g

                              = 0.315 g

Thus, we can conclude that the mass of liquid ethanol is 0.315 g.

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