How many molecules of hco3 are in 4 moles of the substance?

This question is about Avogadro's number.

Avogadro's number is the number is 6.022 * 10^23.

That means that 1 mol of molecules is 6.022 * 10^23  molecules, so 4 moles is 4 * 6.022 * 10^23 molecules = 24.088 * 10^23 molecules = 2.4088 * 10^24 molecules.

2.4088 * 10^24 molecules.