Unit 4: The Mole | Baamboozle - Baamboozle | The Most Fun Classroom Games!

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An unknown compound is 63.02% C and 5.3% H, the rest is O. What is the empirical formula?

C8H8O3

Solve and round to the correct sig figs: 53.0 + (1.4*10^3)

1500

Empirical formula for a compound with 85.63% C and 14.37% H

CH2

Mass percent of all elements in sodium bicarbonate?

Na: 27.37% ; H: 1.20% ; C: 14.30% ; O: 57.14%

Mass percent of carbon in CH4?

74.87% carbon

What is the value of Avogadro's number?

6.022 * 10^23 particles

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

How many molecules are in 23.5 g of nitrogen? (Remember: HNFOICB!!!)

5.05 * 10^23 N2 molecules

Error that can be reduced by repeated trials

Random error

Mass percent of nitrogen in ammonium nitrate?

35.00% N

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 atoms are in 2.53 moles of sulfur?

1.52 * 10^24

Mass percent of hydrogen in ethane

20.11% H

How many sig. figs. are in 0.0100?

3

Molecular formula of a compound with an empirical formula NO2 and molar mass of 92.011 g/mol

N2O4

The type of error when a balance consistently weighs high by 5%

Systematic error