Is there any difference between oxalic acid and oxalic acid dihydrate? Is there difference in their molar mass? Is the molar mass of any substance always g/mol no matter the substance?

Oxalic acid is H2C2O4.

Oxalic acid dihydrate is H2C2O4.2H2O
Of course there is a difference in molar mass. The dihydrate has an additional 36 g/mol because of the two H2O moleculeds.
Molar mass can be any unit you want it to be but if you use the numbers in the periodic table you get g/mol.

Ah, yes, oxalic acid and oxalic acid dihydrate. Quite the mouthful, aren't they? Well, the main difference between the two is the water content. Oxalic acid dihydrate contains two molecules of water, while oxalic acid is an anhydrous form without any water molecules attached.

Now, if we talk about molar mass, it's a different story. The molar mass of oxalic acid (C2H2O4) is about 90.03 g/mol, while the molar mass of oxalic acid dihydrate (C2H2O4·2H2O) is around 126.07 g/mol. So, you see, that extra water brings some extra mass to the party.

Now, about your second question. Is the molar mass of any substance always g/mol, no matter the substance? Well, my dear friend, g/mol is indeed the unit for molar mass. It stands for grams per mole. It doesn't matter if you're talking about feathers or rocks, the molar mass will always be expressed in g/mol. So, whether you're at a feather convention or a rock concert, g/mol is the way to go!

Yes, there is a difference between oxalic acid and oxalic acid dihydrate. Oxalic acid, also known as ethanedioic acid, has the chemical formula H2C2O4. It is an organic compound that is commonly found in some vegetables and can be produced synthetically.

Oxalic acid dihydrate, on the other hand, has the chemical formula H2C2O4·2H2O. It is the hydrated form of oxalic acid, meaning that it contains two molecules of water in its structure. The "dihydrate" designation indicates that two molecules of water are associated with each molecule of oxalic acid.

In terms of their molar mass, they do have different values. The molar mass of oxalic acid (H2C2O4) is about 90.03 g/mol, whereas the molar mass of oxalic acid dihydrate (H2C2O4·2H2O) is approximately 126.07 g/mol.

Regarding the molar mass of substances, it is true that the molar mass of a substance is expressed in grams per mole (g/mol). Molar mass represents the mass of one mole of a chemical substance, and it is a property specific to each individual substance. So, while the units may always be g/mol, the numerical value will vary depending on the substance being considered.

Yes, there is a difference between oxalic acid and oxalic acid dihydrate.

Oxalic acid (C2H2O4) is an organic compound that exists in the anhydrous form, meaning it does not contain any water molecules within its structure. On the other hand, oxalic acid dihydrate (C2H2O4 · 2H2O) is the hydrated form of the compound, which includes two water molecules (dihydrate) in its crystal structure. The dihydrate form is often a solid crystal with the water molecules embedded within it.

Regarding the molar mass, there is a difference between the molar masses of oxalic acid and oxalic acid dihydrate. The molar mass is the mass of one mole of a substance, and it is expressed in grams per mole (g/mol).

The molar mass of oxalic acid (C2H2O4) can be calculated as follows:
2 atoms of carbon (C) × atomic mass of carbon (12.01 g/mol) +
2 atoms of hydrogen (H) × atomic mass of hydrogen (1.01 g/mol) +
4 atoms of oxygen (O) × atomic mass of oxygen (16.00 g/mol) = 90.03 g/mol

The molar mass of oxalic acid dihydrate (C2H2O4 · 2H2O) should be calculated by considering the additional molar mass of the water molecules:
2 atoms of carbon (C) × atomic mass of carbon (12.01 g/mol) +
2 atoms of hydrogen (H) × atomic mass of hydrogen (1.01 g/mol) +
4 atoms of oxygen (O) × atomic mass of oxygen (16.00 g/mol) +
2 molecules of water (H2O) × molar mass of water (18.02 g/mol) = 126.07 g/mol

So, the molar mass of oxalic acid dihydrate is higher than that of oxalic acid.

Regarding your second question, the molar mass of any substance is not always g/mol. The unit of g/mol is used for expressing the molar mass because it represents the mass of one mole of a substance. However, depending on the substance, other units may also be used to express molar mass. For example, for gases, the molar mass can be expressed in grams per liter (g/L) at a specific temperature and pressure. The choice of units to express molar mass depends on the nature of the substance being considered.