Chapter 7 Chemical Quantities. The Mole  SI base unit to measure the amount of a substance  1 mole of anything = 6.022 x 10 23 representative particles.

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Presentation transcript:

Chapter 7 Chemical Quantities

The Mole  SI base unit to measure the amount of a substance  1 mole of anything = x representative particles

2. How many molecules are in 2.12 mole of propane(C 3 H 8 )? 3. How many moles are there in 3.01 x forumla units of NaOH?

Ex. molecular formula of H 2 O H = 2(1.01) = 2.02 O = 1(16.0) = g Gram formula mass – mass of one mole of an ionic compound formula mass of CaCl 2

9.45 mole N 2 O g N 2 O 3 1 mole N 2 O 3 =718 g N 2 O 3

Find the number of moles in 92.2 g of iron(III) oxide.

22.4 L = 1 mole 22.4 L = x representative particles Density of a gas is in units of g/L g 22.4 L

Percent Composition

Shows the simplest whole-number ratio of the atoms in a compound Can be the true formula sometimes

1.Analysis shows a compound to contain 26.56% K, 35.41% Cr, 38.03% O. Find the empirical formula.

Indicates the ratio of the atoms Shows the actual number of atoms Can be reduced sometimes