AP BIOLOGY

Detailed explanation-1: -Typically, concentration = Amount of solute in molesVolume of solution in litres . And thus, typically, concentration has units of mol⋅L−1; this is typically called the molarity of the solution.

Detailed explanation-2: -The number of atoms of ANY substance in a volume is: # of atoms = N * (density) * volume / (Molecular Weight). N is a constant called Avogadro’s number and its equal to 6.022*1023 atoms/mole. It can also be molecules per mole. In the above formula density times volume is just the mass.

Detailed explanation-3: -To determine the required number of molecules, first determine the molecular weight of the substance for one mole, then divide the molar mass value by the molecular mass, and multiply by the Avogadro constant.

Detailed explanation-4: -volume of liquid (in litres) × concentration (in mol/L) = number of moles of substance . Putting in our numbers, we find that we need 0.5×3=1.5 moles 0.5 × 3 = 1.5 moles of glucose. Finally, to work out the mass of glucose we need, we use the formula molecular weight×number of moles=mass of substance.

Detailed explanation-5: -After calculating the number of moles, the number of molecules will be equal to the product of the number of moles and Avogadro’s number, given by; Number of ions= (number of moles)X. 022 × 10 23 ) ( ∴ N A = Avogadro’s number)