Self-Assessment Quiz

1			How many amu's are in 1 gram?
			A)	it depends on the element
			B)	it depends on the formula of the compound
			C)	6.022 x 10 23
			D)	not enough information
2			To convert between molecules and moles of a substance, _____ must be used.
			A)	formula masses
			B)	mole ratios
			C)	atomic masses
			D)	Avagadro's number
3			Calculate the number of molecules in 4.53 moles of water.
			A)	2.73 x 10 24
			B)	6.022 x 10 23
			C)	4.01 x 10 25
			D)	1.01 x 10 22
4			How many moles are in 2.03 x 10 25 moles of titanium(IV)chloride?
			A)	3.37
			B)	33.7
			C)	0.0296
			D)	0.296
5			What is the mass in grams of 0.457 moles of nitrogen gas?
			A)	6.13 g
			B)	6.40 g
			C)	12.80 g
			D)	6.78 g
6			Find the mass of 5.24 x 10 21 molecules of tungsten(VI)bromide.
			A)	3.45 g
			B)	13.0 g
			C)	0.00154 g
			D)	0.378 g
7			How many molecules are in 125.42 g of chloroform, CHCl3?
			A)	6.33 x 10 23
			B)	2.14 x 10 24
			C)	7.84 x 10 25
			D)	1.58 x 10 -24
8			In 45.32 g BaCl2, how many atoms of chlorine are present?
			A)	2.46 x 10 23
			B)	4.92 x 10 23
			C)	1.23 10 24
			D)	1.23 x 10 23
9			To convert between moles and atoms of a substance, _____ must be used.
			A)	formula masses
			B)	mole ratios
			C)	atomic masses
			D)	Avagadro's number
10			Calculate the number of molecules in 4.53 moles of carbon dioxide.
			A)	2.73 x 10 24
			B)	6.022 x 10 23
			C)	4.01 x 10 25
			D)	1.01 x 10 22
11			How many moles are in 4.06 x 10 25 molecules of sodium fluoride?
			A)	6.4
			B)	67.4
			C)	0.0198
			D)	0.198
12			What is the mass in grams of 3.46 moles of chlorine gas?
			A)	45.78 g
			B)	8.45 g
			C)	241.08 g
			D)	120.54 g
13			Find the mass of 7.35 x 10 22 molecules of titanium(IV)bromide.
			A)	44.85 g
			B)	448.52 g
			C)	0.022 g
			D)	0.222 g
14			How many molecules are in 64.42 g of dichloromethane, CH2Cl2?
			A)	4.57 x 10 23
			B)	2.14 x 10 24
			C)	7.84 x 10 25
			D)	1.58 x 10 -24
15			In 1.42 g BeF2, how many atoms of fluorine are present?
			A)	6.42 x 10 23
			B)	3.64 x 10 22
			C)	1.82 x 10 22
			D)	1.23 x 10 23