Physical Science Ms. Cilli December ½, 2011. While we wait, review conversion factors.

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Presentation transcript:

Physical Science Ms. Cilli December ½, 2011

While we wait, review conversion factors

Convert between moles and mass of a substance using molar mass. Calculate amounts of reactants or products by using molar mass, mole ratios, and balanced chemical equations.

A mole (abbreviate mol) is an amount of substance that contains 6.02 x particles One mol of eggs contains 6.02 x10 23 eggs or 602,000,000,000,000,000,000,000 eggs

1 mol element = x grams element X is the molar mass for the element Where do you find the molar mass again?

Find the conversion factors for converting between grams and moles: Moles to grams of Au Grams to moles of Na Grams to moles of C Moles to grams of Ni

1 mole= g mass of cmpd

Review for Conversion Factors

Convert 35.6g Au to moles –What is the conversion factor?

Help me… How many grams are in 6.82 moles of Na? –What is the conversion factor?

Your turn… How many moles are in g of C? –What is the conversion factor?

How many grams are in 9.45 moles of Al 2 O 3 ? –Mass of Al 2 O 3 = g/mol –CF: 1 mole=101.96g Al 2 O moles Al 2 O 3 1 mole g Al 2 O 3 = g Al 2 O 3

How many moles are in g BrO 2 ? –What is the conversion factor for the cmpd?

How many grams are in 2.50 mol KCl? How many moles are in 75.0g of dinitrogen trioxide?

2H 2 + O 2  2H 2 O How much oxygen do we need to make 144 grams of water? 1.Find the molar mass 2.Convert from 144 grams H 2 O to moles H 2 O 3.Use mole ratio to go from moles H 2 O to moles O 2

2H 2 + O 2  2H 2 O How much oxygen do we need to make 144 grams of water? 1.Find the molar mass 2.Convert from 144 grams H 2 O to moles H 2 O 3.Use mole ratio to go from moles H 2 O to moles O 2

When doing mole conversions, you use the ______ for the element or compound. A.Molar mass B.Atomic number C.Atomic mass D.All of these

Independent Work: –Read pages –Answer the review questions –Work on the study guide Homework: –Section 7.1b Assignment due Friday, December 2 nd by 8PM

Independent Work: –Read pages –Answer the review questions –Work on the study guide Homework: –Section 7.1 Assignment due Monday, December 5 th by 8AM Yes, you will need to complete it over the weekend and have it turned in Monday morning