Atoms
How many atoms are in 2 moles of any substance?
1.204 x 10^24
What is another name used for the term "mole"?
Avogadro's Number
What conversion factor is used to convert from grams of an element to moles of an element?
The molar mass
How many atoms in 0.250 mol S?
1.51 x 10^23 atoms S
How many particles are in a mole?
6.022 x 10^23 particles
What conversion factor is used to convert from grams of an element to moles of an element?
Avogadro's Number
How many moles in 3.011 x 10 ^23 atoms Mg?
0.5000 mol Mg
How many moles in 0.00750 g Ag? (answer in scientific notation)
6.95 x 10^-5 mol Ag
What is the molar mass of iron?
55.85 g/mol
List the steps for how you would convert from atoms of an element to the mass of an element in grams.
1) convert from atoms to moles using Avogadro's #
2) convert from moles to grams using the molar mass
How many grams in 60.2 x 10^23 atoms of carbon?
120. g C
How many moles in 2.25 x 10^25 atoms of zinc?
37.4 mol Zn
What is the molar mass of Xenon?
131.29 g/mol
How many atoms in 0.02550 g of platinum?
7.872 x 10^19 atoms Pt
How many moles in 150 grams of sulfur?
4.7 mol S
How many grams are in 84.2 atoms of Br?
1.12x10^-20 g Br
How sheets of paper are in a ream?
500
How many significant figures are in the number 0.00120?
3 sig figs