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Anon25 [30]
3 years ago
7

A solution is prepared by dissolving 30.05 g of ammonium dichromate in water and diluting it to 500 mL. What is the molarity of

the solution?
Chemistry
1 answer:
Oksana_A [137]3 years ago
4 0

Answer:

Molarity(M) = 0.24M in (NH₄)₂Cr₂O₇.

Explanation:

By definition a solution is a homogeneous physical mixture of two substances, a solute (item in least amount) and solvent (item in greatest amount). Typically the solution is generally described in terms of the concentration of solute in solution (solute + solvent). Concentration is, by definition amount of solute divided the volume of solution. That is ...

concentration = amount solute / volume of solution

There are numerous unit expressions of concentration such as lbs/gal, lbs/ft³, grams/ml and molarity(M). For this problem, Molar Concentration following concentration definition is ...

Molarity(M) = moles solute / volume of solution in liters

moles of (NH₄)₂Cr₂O₇ = 30.05g/252.07g/mole = 0.12mole

Volume of Solution = 500ml = 0.500Liters

∴Molarity = [(NH₄)₂Cr₂O₇] = 0.12 moles / 0.500L = 0.24M in (NH₄)₂Cr₂O₇.

Note => the brackets [ ] around the formula (NH₄)₂Cr₂O₇ indicates Molar concentration.

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If sodium is burned in chlorine gas, a compound is formed that dissolves in water. What colour will the solution be?
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6 0
1 year ago
Boron has two naturally-ocurring isotopes. Boron-10 has an abundance of 19.8% and actual mass of 10.013 amu, and boron-11 has an
aniked [119]

Answer:

Average atomic mass = 10.812 amu

Explanation:

The formula for the calculation of the average atomic mass is:

Average\ atomic\ mass=(\frac {\%\ of\ the\ first\ isotope}{100}\times {Mass\ of\ the\ first\ isotope})+(\frac {\%\ of\ the\ second\ isotope}{100}\times {Mass\ of\ the\ second\ isotope})

Given that:

<u>For first isotope, Boron-10: </u>

% = 19.8 %

Mass = 10.013 amu

<u>For second isotope, Boron-11: </u>

% = 80.2 %

Mass = 11.009 amu

Thus,  

Average\ atomic\ mass=\frac{19.8}{100}\times {10.013}+\frac{80.2}{100}\times {11.009}=1.982574+8.829218=10.811792

<u>Average atomic mass = 10.812 amu</u>

6 0
3 years ago
Read 2 more answers
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