4.6 – NOTES Moles Conversion

C.7 1/2 Molar Relationships Changing between particles, moles, and mass Mole Mountain: Used to help with conversions between moles, mass, and particles Particles can stand for atoms, molecules, or formula units.

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Example 1: How many moles are in a 45 gram sample of SO2? Changing between mass and moles Example 1: How many moles are in a 45 gram sample of SO2?   Example 2: If you have 0.0718 moles of HNO3, how many grams is that?

Example 4: Change 4.55 moles of H2O into molecules Changing between particles and moles Example 3: If you have 2.3 x 1024atoms of carbon, how many moles is that?   Example 4: Change 4.55 moles of H2O into molecules

Changing between particles and mass There is no direct relationship between particles and mass, so you need to do an intermediate step and change the given value into moles. These problems take two steps.   Example 5: How many atoms are in a 3.4 gram sample of gold, Au?

Example 6: 4.51 x 1023molecules of F2 would have a mass of ______ g?

Mole Ratio- comes from balanced equation; uses coefficients Substance looking for substance given info for