Molar Mass Calculation: Find (HOCH2CHOH)CH2O2 Mass

• lha08
In summary, the conversation is discussing the method for finding the molar mass of a compound, specifically (HOCH2CHOH)CH2O2, which is also known as glycerol or 1,2,3-propanetriol. The compound's molecular formula and structure are given, and it is explained that the content inside parentheses should be taken as many times as indicated outside the parentheses. It is also noted that sometimes parentheses are used to show a separate group of atoms, but in this case it appears to be a trick.

Homework Statement

I'm having a lot of trouble trying to find the molar mass of (HOCH2CHOH)CH2O2

The Attempt at a Solution

Do i have to multiply the molar mass inside the bracket (HOCH2CHOH) by the outside CH2O2?

You are asking about how to find the mass of one mole of the compound. Maybe you have some difficulty with the text-based way to express the compound? What is the exact name of your compound? Maybe an empirical formula would make the method more apparent to you.

symbolipoint said:
You are asking about how to find the mass of one mole of the compound. Maybe you have some difficulty with the text-based way to express the compound? What is the exact name of your compound? Maybe an empirical formula would make the method more apparent to you.

The compound's name is glycerol

Thanks. This makes the identity of the compound plain. Now, does the name tell you anything about the structure? Maybe not. Another name for glycerol is 1,2,3-propanetriol. If you know enough about simple naming of organic compounds, you could make sense of that; but since you asked, you did not yet progress that far.

A good wikipedia article showing the structure is this:
http://en.wikipedia.org/wiki/Glycerol
A molecular formula is also given.

lha08 said:
Do i have to multiply the molar mass inside the bracket (HOCH2CHOH) by the outside CH2O2?

No. Content of parentheses is to be taken as many times, as number after the closing parenthese tells. No number - no multiplication.

Ca3(PO4)2 - means 3 atoms of Ca and 2 groups of 1 atom of P and 4 atoms of O.

Sometimes you may want to use parentheses to show that some group of atoms is to be treated separately for some reason, but this is not a formal notation.

(Na)Cl - 1 atom of Na, 1 atom of Cl. Parentheses not necesary.

In this case looks like they put the parenthese only to trick you into thinking there is more to it. There is no.

1. What is molar mass?

Molar mass is the mass of one mole of a substance, measured in grams per mole (g/mol).

2. How do you calculate molar mass?

To calculate molar mass, you need to determine the atomic masses of each element in the compound (found on the periodic table) and multiply it by the number of atoms present. Then, add up the masses of all the elements to get the molar mass.

3. What is the molar mass of (HOCH2CHOH)CH2O2?

The molar mass of (HOCH2CHOH)CH2O2 is 90.08 g/mol.

4. Why is molar mass important in chemistry?

Molar mass is important in chemistry because it allows us to convert between the mass of a substance and the number of moles present. This is useful for performing calculations and determining the amount of a substance needed for a reaction.

5. How does molar mass affect the properties of a substance?

Molar mass can affect the physical and chemical properties of a substance, such as boiling point, melting point, and reactivity. Molecules with higher molar mass tend to have stronger intermolecular forces, making them have higher boiling and melting points. Molar mass also plays a role in determining the density of a substance.