A measurement for the number of atoms, molecules, or formula units in a substance--there are 6.022 x 10^23 particles/mole
100
How many atoms in 0.250 moles of silver?
1.51 x 10^23 atoms Ag
100
Name the following:
HCl
hydrochloric acid
100
What is percent composition?
The percent by mass of each element in a compound.
100
What is the empirical formula of ascorbic acid? C6H8O6
C3H4O3
200
What does molar mass mean?
The number of grams in one mole of a substance. For example, the mass of oxygen is 16 grams. This means for 6.022 x 10^23 oxygen atoms, it has a mass of 16 grams.
200
How many moles in 1.56 x 10^23 formula units of sodium hydroxide?
.259 moles NaOH
200
Name the following: NaBr
sodium bromide
200
How many moles of oxygen are in the following compound:
2Fe(OH)3
6
200
What is the empirical formula of a compound that contains 10.52 g Ni, 4.38 g C, and 5.10 g N?
Ni(CN)2
300
What is an empirical formula?
The smallest whole number mole ratio of the elements--this may or may not be equal to the actual molecular formula.
300
Calculate the mass of 5.22 mol He
20.9 grams of He
300
Name the diatomic elements
Br, I, N, Cl, H, O, F
300
What is the percent of water Na2CO3 * 10H20?
62.97%
300
The empirical formula for a compound is PbCl4. If the molar mass of this compound is 349.0 g/mol, what is the molecular formula?
PbCl4
400
What does anhydrous mean?
without water
400
Calculate the percent of carbon in C12H22O11
42.1 %
400
How many atoms are in a mole of carbon?
6.022 x 10^23
400
What is the name of the following hydrate:
Na2CO3 * 10H20
sodium carbonate decahydrate
500
What does the prefix "tetra" mean?
Four
500
The mass of one molecule of barium hexafluorosilicate (BaSiF6) is
4.64 x 10^-22 grams
500
Write the chemical formula for lead (II) chloride
PbCl2
500
What is the molar mass of sulfur?
32.065 grams/mole
500
A 1.628 gram sample of a hydrate of magnesium iodide is heated until its mass is reduced to 1.072 grams and all the water has been removed. What is the formula of the hydrate?