Which family in the periodic table has metals that are usually harder than other metals? Alkali metals Alkaline earth metals Lan
1 answer:
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Answer:
249.94ppm
Explanation:
Given parameters:
Mass of Pb(NO₃)₂ = 0.025g
Mass of water = 100g
Unknown:
Concentration of solution in ppm = ?
Solution:
Concentration in parts per million gives the amount of solute found in a million units of the solution. They are desirable for expressing very small amount of solutes in a large solution. For example, the level of arsenic in the soil.
Concentration in ppm =
A solution is made up of solute and solvent. The solvent here is water.
mass of solution = mass of solute + mass of solvent = 0.025 + 100 = 100.025g
Concentration in ppm = = 249.94ppm
Answer:
The correct answer is option d.
Explanation:
On submission of an incorrect answer to a multiple-choice question with n options, we will lose:
of credit
If we multiple-choice question has five answer choices. And we have submitted 1 wrong answer. the fraction of credit we loose :
of credit
of credit
credit
The percentage of credit we loose:
of credits
of credits