exam 3 (chem1301)

how many molecules of O2 are there in 2.2000000000000002 mol of O2?

• 1.3248400000000002 x 10^24

• 3.6532713384257729 x 10^-24

• 14.545454545454545

• 70.400000000000006

• 2.7372727272727269 x 10^23

a 36.600000000000001-mol sample of Co represents how many atoms?

• 2.2040519999999995 x 10^25 atoms

• 6.0777150448356041 x 10^-23 atoms

• 1.2988478435999997 x 10^27 atoms

• 1.6453551912568303 x 10^22 atoms

• 6.7180200000000001 x 10^2 atoms

an aqueous solution of potassium chloride is mixed with an aqueous solution of sodium nitrate. identify the solid in the balanced equation

• KNO3

• there is no solid formed when the two solutions are mixed

• NaCl

• KCl

• NaNO3

how many atoms of fluorine are there in 1.7 mol F2?

• 5.6459647957489212 x 10^-24 atoms

• 1.7711764705882351 x 10^23 atoms

• 1.0237399999999999 x 10^24 atoms

• 2.0474799999999997 x 10^24 atoms

• 5.1186999999999996 x 10^23 atoms

the molar mass of strontium hydroxide, Sr(OH)2 is

• 121.64000000000001 g/mol

• 104.63000000000001 g/mol

• 192.25 g/mol

• 105.64000000000001 g/mol

• 209.26000000000002 g/mol

which of the following ionic compounds is soluble in water?

• MgCO3

• Al2(CO3)3

• K2CO3

• Cu2CO3

• CaCO3

which of the following ionic compounds is insoluble in water?

• FeCl3

• BaCl2

• NaCl

• CaCl2

• PbCl2

when 25.0g of CH4 reacts completely with excess chlorine yielding 45.0g of CH3Cl, what is the percentage yield, according to CH4(g) + Cl2(g) --> CH3Cl(g) + HCl(g)

• 78.9

• 43.0

• 44.4

• 55.6

• 57.0

the number of grams in 2.5800000000000001 mol of sodium carbonate is

• 41.081395348837205 g

• 0.024341919048966886 g

• none of these

• 214.14000000000001 g

• 273.45420000000001 g

the reaction AgNO3(ag) + NaCl(aq) --> AgCl(s) + NaNO3(aq) is a(n) ___ reaction

• precipitation

• oxidation-reduction

• single-replacement

• none of these

• acid-base