Chapter 7 Flashcards
(88 cards)
What is the oxidation number of hydrogen in MgH2
-1
What is the oxidation number of sulfur in S8
0
What is the oxidation number of Cu in Cu2S
+1
What is the oxidation number of Cr in Na2CrO4
+6
What is the oxidation number of C in HCO3-1
+4
What is the oxidation number of N in NH4+1
-3
What is the oxidation number of Br in HBrO3
+5
What is the oxidation number of S in Na2S2O3
+2
How many atoms are represented by the formula Ca(HSO4)2
13 atoms
Assign the oxidation number to the sulfur in Ca(HSO4)2
+6
Arrange the following in order of increasing oxidation number of the nitrogen atom: N2, NH3, N2O4, NO3-1, N2O
NH3, N2, N2O, N2O4, NO3-1
What is the number of atoms in 7.46g Li
6.51 x 1023atoms
What is the number of molecules in 43.0 g NH3
1.52 x 1024 molecules
What is the number of formula units in 159g lead (ii) chromate
2.96 x 1023formula units
What is the number of SO4-2ions in 14.3g Cr2(SO4)3
6.58 x 1022ions
An oxide of osmium (Os) is a pale yellow solid. If 2.89g of the compound contains 2.16g osmium, what is its empirical formula?
OsO4
Find the percent composition of aspirin, C9H8O4
C = 60.0%
H = 4.4%
O = 35.6%
Sorbic acid is added to food to inhibit mold. Its composition is 64.30% carbon, 7.20% hydrogen, and 28.50% oxygen, and its gram molecular weight is 112.0 g/mole. What is its molecular formula?
C6H8O2
Ribose is an important sugar with a molar mass of 150.0 g/mole. If its empirical formula is CH2O, what is its molecular formula?
C5H10O
An alloy of iron (54.7%), nickel (45.0%) and manganese (0.30%) has a density of 8.17g/cm3. How many iron atoms are there in a block of alloy measuring 10.0cm x 20.0cm x 15.0cm
1.45 x 1026 iron atoms
Arrange the following in order of increasing mass, from smallest to largest:
A. 25g of oxygen gas
B. 1.00 mole of H2O
C. 3.00 x 1023 molecules of C2H6
D. 2.00 x 1023 molecules of C2H6O2
C, B, D, A
Name Na2CrO4
sodium chromate
Name AgCl
silver chloride
Name K2S2O3
potassium thiosulfate