Counting Atoms in a Chemical Formula
How many total atoms are in the following formula - NaCl
2
What is the molar mass of Zinc? Must include units.
65.38 g/mol
How many moles are in 5 grams of carbon?
0.42 moles C
6.022x1023 represents one ______ of atoms/molecules.
mole
What does Empirical mean?
Based on experimental evidence.
How many atoms of chlorine are in the following formula - AlCl3
3
What is the molar mass of CaO? Units!
56.08 g/mol
How many moles are in 6.5 grams of NaCl?
0.11 mol NaCl
How many atoms are in 0.3 moles of silver?
1.81x1023 atoms
A compound is made up of 0.40 moles of hydrogen, 0.39 moles of carbon, and 0.80 moles of oxygen. What is the empirical formula of this compound?
HCO2
How many total atoms are in the following formula - AgBF4
6
What is the molar mass of H2O? Units!
18.02 g/mol
Three nails together have a mass of 3.05 g. How many moles of iron do they contain?
0.05 mol Fe
How many atoms of fluorine are in 3.4 moles of CaF2?
4.09x1024 atoms
What is the percent by mass of Ca in calcium chloride, CaCl2?
35.1% Ca
How many atoms of hydrogen are in the following formula - CH3COCH3
6
What is the molar mass of H2SO4?
98.08 g/mol
A student needs to use 0.575 moles of sodium chloride in an experiment. How many grams should she mass out?
33.60 g NaCl
How many atoms are in 4 moles of H2O?
7.23x1024 atoms
A compound is made up of 0.30 moles of hydrogen, 0.60 moles of carbon, and 0.89 moles of oxygen. What is the empirical formula of this compound?
HC2O3
How many total atoms are in the following formula - Mg(OH)2
5
What is the molar mass of Al(OH)3?
78.0 g/mol
Suppose that you massed out 3.50 g of Na2CO3. How many moles would you have?
0.03 mol Na2CO3
How many atoms are in 12 grams of carbon?
6.02x1023 atoms
What is the percent by mass of Cl in calcium chloride, CaCl2?
63.9% Cl