Unit 6 Chemical Quantities

Atoms

100

How many atoms are in a mole?

6.02 x 10²³ atoms

200

How is the number of moles converted to number of atoms of a sample?

Multiply by 6.02 x 10²³

300

How many moles in 3.011 x 10²³ atoms Mg?

0.5000 mol Mg

400

How many atoms in 0.250 mol S?

1.51 x 10²³ atoms S

500

How many atoms in 0.02550 g Pt?

7.872 x 10¹⁹ atoms Pt

Grams

100

What is the mass of 1 mole of an element?

The mass of the element found on the periodic table

200

What is the mass of 1 mole of a compound? 

the mass of each atom, added together 

300

What is the mass (g) of 1.00 mol Li?

6.94 g Li

400

How many moles are in 0.535 g Zn?

0.00818 mol Zn

500

How many moles are in 13.8 g of Sodium Chloride, NaCl?

0.236 mol

Mix

100

What is the molar mass of Xenon?

131.3 g/mol

200

What is the empirical formula for P₄O₁₀?

P₂O₅

300

How many moles in 150 g S?

4.7 mol S

400

What would be the molarity of a 100 ml 10 M solution if I add 300 ml of water to it?

2.5 M

500

How many atoms in 6.755 mol Pb?

4.068 x 10²⁴ atoms Pb

Molarity

100

What is molarity?

A measure of concentration of a solution

200

What is the formula used for dilution calculations?

M₁V₁ = M₂V₂

300

After adding 300 ml of water to a 150 ml 12 M solution what is the final molarity? 

4 M

400

The final molarity of a solution is  0.5 M, the initial molarity and volume are 2.5 M and 320 ml. what is the final volume?

1600 ml

500

How much water was added to a 500 ml 4 M solution if the final molarity is 1 M? 

1500 ml 

Percent composition and formulas

100

Is N₂O₄ an empirical or molecular formula?

Molecular

200

What is the empirical formula for P₄O₁₀?

P₂O₅

300

What is the percent composition of hydrogen (H) in water (H₂O)?

11.2 %

400

What is the percent composition of ALL elements in N₂S₂?

N 30.4%

S 69.6%

500

What is the percent composition of ALL elements in (NH₄)₂S?

N 41.1%  H 11.8%  S 47.1%