Ch 7, 8 Zumdahl
3/8/2016
NAME_________Key______________
Chem 111- Quiz 6
1. (4 pts) Balance the following equation and state what type (or types) of reaction it is:
2
NO(g) +
1
O2(g) 
2
NO2(g)
Reaction with oxygen is redox (oxidation reduction)
2 substances coming together to form a single substance is synthesis
2. (2 pts) How many atoms of iodine are contained in a sample that has a mass of 1.1421
x 104 amu? Iodine, I, has molar mass of 126.9 amu/atom (or g/mole)
1.1421 x 104 amu
x
1 atom/126.9 amu = 90 atoms (amu cancels)
3. (4 pts) What would 1451 iodine atoms weigh in amu?...in grams?
Iodine, I, has molar mass of 126.9 amu/atom (or g/mole)
1451 atoms x 126.9 amu/atom = 1.841 x 105 amu (atoms cancel)
1451 atoms x 1 mole/(6.022 x 1023 atoms) x 126.9 g/mole = 3.058 x 10-19 g