Volume
What does it mean when a gas is at standard temperature and pressure?
Standard temperature= 273K or 0C
Standard pressure = 1 atmosphere
Define the term anhydrous
without water
State the difference between molecular and empirical formula
empirical formula represents the smallest whole number ratio of the elements while molecular formula represents the actual number of atoms of each element of a compound
What is the percent composition of Iodine in I2 gas?
100%
this number and its units are the link to go from moles to volume
22.4L
How many water molecules are in hexahydrate?
six
Name a molecule that has the same molecular and empirical formula
Water (H2O), Carbon dioxide (CO2), Carbon Monoxide (CO), diphosphorus pentoxide (P2O5) etc.
Name one of the two formulas involved in calculating percent composition.
Percent by mass (%) = (mass of element (g) ) /(mass of compound (g)) × 100
OR
Percent by mass (%) = (mass of element in 1 mol of compound /(molar mass of compound) × 100
Name two of the seven diatomic gases
Oxygen (O2), Nitrogen (N2), Chlorine (Cl2), Fluorine (F2), Hydrogen (H2), Iodine (I2)
What is the name if this hydrate?
BeSO4 ⋅ 4H2O
Beryllium sulfate tetrahydrate
Determine the molecular formula of the compound with an empirical formula of CH and a molar mass of 78.110 g/mol.
C6H6
What is the percent composition for Magnesium in Mg(NO3)2?
16.39%
What volume will 3.0 moles of chlorine gas occupy at STP?
67.2L
a 3.0g sample of Na2CO3 . H2O is heated to a constant mass, how much anhydrous salt remains?
2.6g
A sample of copper metal weighing 2.50 g is heated to form an oxide of copper. The final mass of the compound is 3.13 g. Determine the empirical formula of the oxide
CuO
What is the percent composition of HCl in a 30.00g sample that is 0.83g H and 29.17g Cl
2.76% H
97.24% Cl
How many grams are in 10.2L of CO2 gas at STP?
20.0g of CO2 gas
Anhydrous lithium perchlorate (LiClO4) (4.78 g) was dissolved in water and re-crystalized. The mass of the hydrated salt obtained was 7.21 g.
What is the formula of the hydrate?
LiClO4 · 3H2O
Determine the empirical formula of a compound that contains
0.1299 mol C,
0.31176 mol H
0.10392 mol O.
C5H12O4
A compound has the following percentage composition:
40.0% carbon,
6.72% hydrogen,
53.28% oxygen.
How many moles of hydrogen are present in 100 g of the compound described above?
6.67 mol