Empirical and Molecular Formula
This is the actual formula for a given substance
What is a molecular formula
What is Avogadro's #?
What is 6.02 x 1023
Calculate the molar mass of sodium chloride
What is 58.5 g/mol
Set up the following problem so that all of the unwanted units cancel out...do fill in numbers BUT do not solve!!! How many atoms are in 24 g of Calcium?
What is 24g Ca x (__1__mol / __40.1__ g) x (_6.02 X 1023___ atoms / ___1___ mol)
The units for this term are g/mol
What is molar mass
A compound with an empirical formula of CFBrO and a molar mass of 254.7 grams per mole. What is the molecular formula?
C2F2Br2O2
How many molecules are in one mole of sodium chloride
What is 6.02 x 1023 molecules NaCl
What is the molar mass of (NH4)3PO4?
What is 149.1 g/mol
Avogadro's number always goes with the units _______________, or ______________ as a conversion factor.
What is atoms, molecules
This number is found on the periodic table is a weighted average of all isotopes of that element
What is average atomic mass
The compound benzamide has the following percent composition. What is the empirical formula?
C = 69.40 % H= 5.825 % O = 13.21 % N= 11.57 %
C7H7ON
How many moles are in 3.2 x 1024 atoms of Cl?
5.3 moles Cl
How many moles are in 3.25g of Sodium?
0.141 mol Na
How many grams are there in 6.51 x 1025 molecules of barium dichromate?
38200 g BaCr2O7 or 3.82 x 104 BaCr2O7
What number always goes with "moles" in the conversion factors between the same substance
What is 1 mole
When 2.5000 g of an oxide of mercury is decomposed into the elements by heating, 2.405 g of mercury are produced. Name the compound.
Mercury (I) Oxide
How many molecules are in 6.5 moles of water?
3.9 x 1024 molecules H2O
How many grams are in 8.23 moles of calcium chloride?
= 914 g CaCl2
How many molecules are in 52 g of phosphorus tribromide?
1.2 x 1023 molecules PBr3
This equals 6.02 x 1023 atoms or molecules
What is a mole
A component of protein called serine has an approximate molar mass of 720 g/mole. If the percent composition is as follows, what is the molecular formula of serine?
C = 34.95 % H= 6.244 % O = 46.56 % and the rest is nitrogen
C20H42O20N6 molecular formula
Is there more or less than one mole in 6.87 x 1022 atoms of Hydrogen?
What is less than
How many grams are in 2.81 moles of ammonium carbonate?
2.70 x 102 g (NH4)2CO3
How many grams are in 5 x 1023 molecules of water?
10 g H2O
If asked to find the number of molecules, the given substance is usually ______________.
What is a compound