University:
University of Georgia
Course:
CHEN-1100 | Introductory Chemistry
Academic year:

2023
Views:

471

Pages:

1
Author:

Nesbyenvkk

Assignment / Mole conversion Chemistry / Grade 11 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. They are: 1 mole = molar mass(g) can be written as 1 mole = 6.02 x 1023 particles can be written as 1 mole molar mass (g) _molar mass (g) 1 mole OR 1 mole 6.02 x 1023 OR 6.02 x 1023_ 1 mole Q1/ What are the Molar mass of the following compounds? 1) H3PO4 1.01 (3) + 30.97 + 16.00 (4) = 3.03 + 30.97 + 64.00 = 98.00 g/mol 2) (NH4)2SO4 [14.01 + 1.01 (4) ] 2 + 32.07 + 16.00 (4) = 36.1 + 32.07 + 64 = 132.17 g/mol Q2/ Solve the following: 1) How many grams are in 11.9 moles of chromium? 11.9 x 51.99 = 618.681 g 2) How many moles are in 9.8 grams of calcium? 9.8 / 40.078 = 0.2445 moles 3) How many moles are in 98.3 grams of aluminum hydroxide, Al(OH)3? Al = 27 g/mol O = 16 g/mol H = 1 g/mol 27+ [16 + 1 ] 3 = 27 + 51 = 78 g/mol Moles = 98.3 / 78 = 1.260 moles 4) How many grams are in 2.3 x 10-4 moles of calcium phosphate, Ca3(PO3)2? (2.3 x 10^-4) x 310.18 = 0.0713 g 5) How many molecules are in 3.49 grams of magnesium hydroxide Mg(OH)2? 3.49/58 = 0.060 x (6.02 x 10^23) = 3.62 x 10^22

Assignment Mole Conversion

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