DIMENSIONAL ANALYSIS (DA) PRACTICE 1 – Practice #5
Math directions:
Show all calculations and unit cancellations. Round all answers to the proper
amount of sig.figs.
Remember that exact numbers like “60 sec = 1 min” and metric conversions
(KHDUDCM) are an infinite number of sig.figs and do not limit the sig.figs in the final
answer.
____________________________________________________________________________________________________________
GENERAL CONCEPTS
1) Define or describe “conversion factor” in your own words.
2) List three common conversion factors that are not already shown on this sheet.
Example: 7 days = 1 week
____________________________________________________________________________________________________________
PARTICLE & MOLE CALCULATIONS
A mole (mol) is a unit used in science to count very small particles like atoms.
1 mole = 6.02 x 102 3 particles and 6.02 x 102 3 particles = 1 mole
3) How many atoms are contained in 0.789 moles of the imaginary element
“Bauckium”?
4) How many mol are equivalent to 5.14 x 1022 atoms of Bauckium?
5) Calculate the number of atoms of Fe in 1.6 mol Fe.
____________________________________________________________________________________________________________
LITER & MOLE CALCULATIONS
Under STP conditions (standard temperature and pressure), 1 mole of any gas will
occupy 22.4 L of space. 1 mole = 22.4 L and 22.4 L = 1 mole
6) Calculate the amount of liters of CO2 if there are 0.4011 mol of CO2 in the
container. Assume STP conditions.
7) Find the amount of moles of ammonia (NH3) in 100.0 L of ammonia at STP.
8) How many L are found in 5.77 mol of Ne gas at STP?
____________________________________________________________________________________________________________
GRAM & MOLE CALCULATIONS
The decimal number of an element on the periodic table (atomic mass) is equal to the
number of grams in one mole of that element. Round that number to 0.01 g.
1 mole = (atomic mass) g and (atomic mass) g = 1 mole
9) Calculate the number of grams in 48.75 mol of sodium (Na).
10) How many moles of aluminum (Al) are found in 300.00 g Al?
11) How many g of xenon (Xe) are equivalent to 0.667 mol Xe?
______________________________________________________________________________________________ MORE →
