how many moles are in 3.78xexponent19 of salicylic acid C7H6O3

To calculate the number of moles in a given amount of a substance, you need to know the molar mass of that substance.

The molar mass of salicylic acid (C7H6O3) can be calculated by summing up the atomic masses of each element in the chemical formula. Here's how you can do it:

1. Locate the atomic masses of each element in the periodic table. The atomic mass of carbon (C) is approximately 12.01 grams/mole, hydrogen (H) is approximately 1.01 grams/mole, and oxygen (O) is approximately 16.00 grams/mole.

2. Multiply the atomic mass of each element by the number of atoms present in the chemical formula. In salicylic acid (C7H6O3), there are 7 carbon atoms, 6 hydrogen atoms, and 3 oxygen atoms.

Calculating the molar mass of salicylic acid:
(7 * 12.01 g/mol) + (6 * 1.01 g/mol) + (3 * 16.00 g/mol) = 138.12 g/mol

Now that we know the molar mass of salicylic acid is 138.12 grams/mole, we can determine the number of moles in 3.78 x 10^19 molecules of salicylic acid using Avogadro's number (6.022 x 10^23 molecules/mol):

(3.78 x 10^19 molecules) / (6.022 x 10^23 molecules/mol) = 6.282 x 10^-5 moles

Therefore, there are approximately 6.282 x 10^-5 moles of salicylic acid in 3.78 x 10^19 molecules.