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What is the formula for a mole?

Community Answer

No. of moles = (Given mass of compound in the question)/Molecular mass of the given compound

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Question

What is the difference between molarity and molar mass?

Community Answer

Molarity is a measure and unit of concentration. It is used to express concentration of a particular solution. On the other hand, molar mass is a unit of mass. It is the mass of 1 mole of a substance.

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How can I calculate molarity if concentration is given as percentage?

Community Answer

Convert the percentage to a decimal by moving the decimal point left two places. For example; 98% would become 0.98, and 6% would become 0.06.

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Question

What is the symbol of molarity?

Community Answer

Molarity is denoted by M.

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How do I calculate molarity without the moles?

Community Answer

You can get your moles by taking the molar mass of each of the elements in the solute and adding them together. (You can get the molar mass of each element off the periodic chart. It's usually the number underneath the symbol.) Don't forget to multiply that number if there is more than one of the element, like H2 or 3NO4. Once you have that total molecular mass for the solute, the molecular mass is always equal to one mole of the solute, so you multiply your grams of mass by 1 mole divided by the molecular mass, which is grams. This will leave you with a division problem. Do it; the answer is in moles because the grams cancelled out.Then, go ahead and do your formula.

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Question

What is the molarity of 5%(m/v) potassium carbonate (mw=138.21 g/mol)?

Community Answer

Better if you solve it yourself, but here is a shortcut. Molarity=10a/molar mass. Here a= number of percent given in the question.

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How can I calculate molarity when I am given mass in milliliters?

Community Answer

Divide the mass by molar mass (mass/molar mass) and convert the milliliters into liters (ml/1000). Now you have moles of solute and liters of solution. Molarity=moles of solute/liters of solution.

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How do I calculate the volume needed to have a specific molarity?

Community Answer

By giving the values of molarity and number of moles in the formula of molarity.

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Can I find the molarity if the liters (or ml) are not given?

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Community Answer

There are different methods for finding molarity. If you don't have volume you can use another formula, like mass divided by relative molecular mass.

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Question

How can I calculate volume in molarity?

Community Answer

Molarity = no of moles of solute/volume of solvent.

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What is the molar concentration equivalent of a 1.5 mg/ml concentration of BSA if the MW of BSA is 66000g/mol?

Community Answer

Molarity = 2.273 * 10^-5 mol/L, density of BSA = 1.5g/L, and molecular wt = 66000 g/mol. So molarity = wt of solute / volume of solution in liter = (1.5 g/L) / (66000 g/mol).

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Question

What is the molarity of a solution that results when 3.64 KCI is dissolved in water and diluted to exactly 200.0 ml?

Community Answer

3.64 * 74.5 = 271.18g solute diluted to form 200 ml solution. 3.64 mole per .2 litre means 18.2 moles per litre. Answer: 18.2 M.

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Question

How can I find molarity of a molecule when the molarity of part of it is given?

Community Answer

Molarity remains the same, as ratio of moles to volume of solution remains the same in constant conditions.

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How do I convert molarity to a percentage?

Community Answer

Divide the mass of a solute by the mass of the compound and multiply the result by 100.

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How do I calculate moles when molarity is given?

Community Answer

Multiply the molarity by the number of liters, make sure you don't use mal or gallons, it will give you a different answer.

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Question

What is the difference between molarity and molality?

Community Answer

Both molarity and molality are measures of the concentration of a solution. Molarity describes the number of moles of solute per unit ''volume'' of the ''total solution''. Molality describes the number of moles of solute per unit ''mass'' of ''solvent''.

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What do I do if the molarity is calculated with mole against volume in cm³?

Community Answer

Convert the volume first as 1 litre =1000 cm^3 and the use the fomula, molarity=moles of solute/volume of solution (litre).

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