Mole Conversions

Atoms

100

How many grams in 60.2 x 10^23 atoms C?

12.01 g C

200

How many moles in 3.011 x 10 ^23 atoms Mg?

0.5000 mol Mg

300

How many grams in 10.5 x 10^23 atoms Mg?

6.05 g Mg

400

How many atoms in 0.250 mol S?

1.51 x 10^23 atoms S

500

How many atoms in 0.02550 g Pt?

7.872 x 10^19 atoms Pt

Moles

100

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

6.94 g Li

200

How many atoms in 6.755 mol Pb?

4.068 x 10^23 atoms Pb

300

How many moles in 0.00750 g Ag? (in scientific notation)

6.95 x 10^-5 mol Ag

400

How many mores in 2.25 x 10^25 atoms Zn?

37.4 mol Zn

500

How many moles in 150 g S?

4.7 mol S

Grams

100

How many moles in 2.65 g Fe?

0.0474 mol Fe

200

How many grams in 6.50 moles Cu

413 g Cu

300

How many moles are in 0.535 g Zn?

0.00818 mol Zn

400

How many grams in 4.50 x 10^12 atoms Cl?

2.65 x 10^-10 g Cl

500

How many grams in 8.42 x 10¹⁸ atoms Br?

0.00112 g Br

Half Life

100

What is half life? 

What is: the amount of time it takes for 1/2 of a radio active substance to decay (become non-radioactive)?

200

If an element has a half life of 5 years, what percent of a sample will still be radioactive in 10 years? 

What is: 25%? 

300

How many grams of an element will be left if you start with 250 grams and it goes through 4 half lives? 

What is: 15.6 grams? 

400

How many half lives does it take to get to 6.25 % of the original sample?

What is: 4?

500

If I know that an element has gone through 3 half lives and 27g are radioactive (NOT decayed), what was the starting mass? 

What is: 216g? 

Periodic Table

100

What is the atomic mass of Chromium? 

What is: 51.996 (52.0) g/mol? 

200

What is the atomic number of silver?

What is: 47?

300

How many moles of an element does it take to equal the mass given on the periodic table? 

What is: 1? 

400

If I have an atom of Na⁺¹, how many electrons does it have?

What is: 10?

500

If I have a sample of Gold with a mass of 200, how many neutrons does it have? 

What is: 121?