How many moles are in 1.2 x 10' grams of ammonia, NH3? 8) 9) How many grams are in 2.3 x 104 moles of calcium phosphate, Cas(POs)h? 10) How many moles are in 3.4 x 10 grams of silicon dioxide, SiO2?

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Chapter6: Chemical Composition
Section: Chapter Questions
Problem 25A
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8)
How many moles are in 1.2 x 10' grams of ammonia, NH3?
9)
How many grams are in 2.3 x 104 moles of calcium phosphate, Cas(P0,)h?
10)
How many moles are in 3.4 x 10 grams of silicon dioxide, SiO2?
Transcribed Image Text:8) How many moles are in 1.2 x 10' grams of ammonia, NH3? 9) How many grams are in 2.3 x 104 moles of calcium phosphate, Cas(P0,)h? 10) How many moles are in 3.4 x 10 grams of silicon dioxide, SiO2?
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There are three definitions (equalities) of mole. They are:
1 mole = 6.02 x 102 particles
1 mole = molar mass (could be atomic mass from periodic table or molecular mass)
1 mole = 22.4L 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
molar mass (g)
molar mass ()
1 mole
OR
Example:
If we know the relationship between mass and moles for a substance we can easily convert between the two. For example
we know that the mass of one mole of NaCl is 58.44 g (equivalent then is one mole = 58.44g). We can now determine the
number of moles in 100.0 g by the following calculations.
1 mole
100.0 g NaCl
=1.711 moles NaCl
58.44g
Or if we have 5.06 moles and we want to know the mass:
58.44 g
5.06 mbles NaCI
- 296 g NaCI
1 mole
Solve the following
Transcribed Image Text:Name Date Per There are three definitions (equalities) of mole. They are: 1 mole = 6.02 x 102 particles 1 mole = molar mass (could be atomic mass from periodic table or molecular mass) 1 mole = 22.4L 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 molar mass (g) molar mass () 1 mole OR Example: If we know the relationship between mass and moles for a substance we can easily convert between the two. For example we know that the mass of one mole of NaCl is 58.44 g (equivalent then is one mole = 58.44g). We can now determine the number of moles in 100.0 g by the following calculations. 1 mole 100.0 g NaCl =1.711 moles NaCl 58.44g Or if we have 5.06 moles and we want to know the mass: 58.44 g 5.06 mbles NaCI - 296 g NaCI 1 mole Solve the following
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