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Mole Fraction = 0.00554 6.) Concentrated nitric acid is 70.0% HNO3 by mass, which is 15.9 M. Calculate the density and molality of concentrated nitric acid. a) Assume exactly 1 liter of solution. That means we have 15.9 moles of HNO3. Mass of HNO3 is then: We can now find the mass of the solution: Density = 1.43 g/mL b)
1 mole = molar mass (could be atomic mass from periodic table or molecular mass) 1 mole = 22.4 L of a gas at STP ( You do not need to worry about this yet ) Each definition can be written as a set of two conversion factors.
How many representative particles are in each of the following mole quantities? 1.24 mol Cl2 7.46 x 1023 molecules.
Mole Calculation Practice Worksheet. Answer the following questions: 1) How many moles are in 25 grams of water? 2) How many grams are in 4.5 moles of Li2O? 3) How many molecules are in 23 moles of oxygen? 4) How many moles are in 3.4 x 1023 molecules of H2SO4? 5) How many molecules are in 25 grams of NH3?
WORKSHEET “Mole Fraction” 1. What is the mole fraction of sodium chloride in a solution containing 0.23 moles of NaCl and 5.5 moles of water? 2. What is the mole fraction of oxygen in a gaseous mixture containing 25 grams of oxygen, 15 grams of nitrogen, and 10 grams of helium?
Molar mass tells us the mass of 1 mol of an atom or compound. In each case we simply calculate the sum of the masses of the atoms in the formula to determine the mass of a mole. These masses can be found on the periodic table. EXAMPLE: Calculate the molar mass of a mole of iodine, I2.
There are three definitions (equalities) of mole. They are: 1 mole = 6.02 x 1023 particles. 1 mole = molar mass (could be atomic mass from periodic table or molecular mass) 1 mole = 22.4 L of a gas at STP (You do not need to worry about this yet) Each definition can be written as a set of two conversion factors.
