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Unit 4: The Mole
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Solve and round to the correct sig figs: 53.0 + (1.4*10^3)
1500
How many sig. figs. are in 0.0100?
3
Mass percent of nitrogen in ammonium nitrate?
35.00% N
Mass percent of all elements in sodium bicarbonate?
Na: 27.37% ; H: 1.20% ; C: 14.30% ; O: 57.14%
Mass percent of hydrogen in ethane
20.11% H
Mass percent of carbon in CH4?
74.87% carbon
Find the molecular formula of a compound containing 31.58% C, 5.30% H, and O. A 1.4 mole sample has a mass of 212.95 g.
C4H8O6
An unknown compound is 63.02% C and 5.3% H, the rest is O. What is the empirical formula?
C8H8O3
Molecular formula of a compound with an empirical formula NO2 and molar mass of 92.011 g/mol
N2O4
Empirical formula for a compound with 85.63% C and 14.37% H
CH2
Error that can be reduced by repeated trials
Random error
The type of error when a balance consistently weighs high by 5%
Systematic error
How many ammonium ions are formed when 0.25 moles of ammonium chromate are dissolved in water?
3.0 * 10^23 ammonium ions
How many molecules are in 23.5 g of nitrogen? (Remember: HNFOICB!!!)
5.05 * 10^23 N2 molecules
How many atoms are in 2.53 moles of sulfur?
1.52 * 10^24
What is the value of Avogadro's number?
6.022 * 10^23 particles


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