mercury is not a mixture it is a element
The balanced chemical reaction is:
<span>HCl + NaOH → NaCl + H2O
</span>
We are given the amount of sodium hydroxide to be used for the reaction. This will be the starting point of our calculations.
0.040 mol NaOH (1 mol HCl / 1 mol NaOH) = 0.040 mol of HCl
Therefore, the correct answer is the third option, 0.040 moles.
Answer:
explanation below
Explanation:
Dichlorodiphenyltrichloroethane, also known as DDT is a chemical compound that is found in insecticides. In 1972, the United States Environmental Protection Agency issued an order for the cancellation of requests for the chemical compound because it affects wildlife and pose risks to humans as well.
From the question here, it was noted that the initial concentration was 22ppm 25years ago and so if it takes 7years to decay by half, the actual concentration in present day farmers could be calculated as follows;
25years ago - 22ppm
18years ago - 11ppm
11years ago – 5.5 ppm
4 years ago - 2.75ppm
Since 7yrs = 0.5
Then 4yrs will be [ [4/7] x 0.5] = 0.2857
Then if 0.5 = 2,
Then 0.2857 = [ [ 0.2857/0.5] x 2] = 1.1428
So present year concentration would then be [2.75ppm/1.1428] = 2.406ppm
Answer:
1.67 M
Explanation:
The following data were obtained from the question:
Initial volume (V1) of solution = 250 mL
Initial Molarity (M1) of solution = 0.5 M
Final volume (V2) of solution = 75 mL
Final Molarity (M2) of solution =?
Thus, we can obtain the final molarity of the solution by using the following formula:
M1V1 = M2V2
0.5 × 250 = M2 × 75
125 = M2 × 75
Divide both side by 75
M2 = 125 /75
M2 = 1.67 M
Thus, the new Molarity of the solution is 1.67 M.