<u>Answer:</u> The molar concentration of NaOH in the final diluted solution is 0.056 M
<u>Explanation:</u>
To calculate the molarity of solution, we use the equation:
Given mass of NaOH = 4.00 g
Molar mass of NaOH = 40 g/mol
Volume of solution = 5.00 mL
Putting values in above equation, we get:
To calculate the molarity of the diluted solution, we use the equation:
where,
are the molarity and volume of the concentrated NaOH solution
are the molarity and volume of diluted NaOH solution
We are given:
Putting values in above equation, we get:
Hence, the molar concentration of NaOH in the final diluted solution is 0.056 M
Gasses the most abundant natural occurring gas is nitrogen which makes up 78% of the air.
Answer:
Wide melting point range - impure sample with multiple compounds
Experimental melting point is close to literature value - pure sample of a single compound
Experimental melting point is below literature value - impure sample with multiple compounds
Narrow melting point range - pure sample of a single compound
Explanation:
The melting point of substances are easily obtainable from literature such as the CRC Handbook of Physics and Chemistry.
A single pure substance is always observed to melt within a narrow temperature range. This melting temperature is always very close to the melting point recorded in literature for the pure compound.
However, an impure sample with multiple compounds will melt over a wide temperature range. We also have to recall that impurities lower the melting point of a pure substance. Hence, the experimental melting point of an impure sample with multiple compounds is always below the literature value.