WorksheetsAP CHEM Unit 01 Mock Quiz
Total questions: 10
Worksheet time: 10mins
A student collected data about several compounds containing only phosphorus and oxygen. What is the expected mass of oxygen that reacts with 10.0g of phosphorus to form the compound P2O10?
12.9g
38.7g
25.8g
6.5g
A new element has two isotopes, one with a mass of 40.0 amu that is 75% abundant. The average atomic weight of the element is 40.50 amu. What is the isotopic mass of the other isotope?
40.0 amu
42.0 amu
41.0 amu
44.0 amu
Which contains the largest number of atoms?
3.0 mL of CH3OH (density = 1.2g/mL)
3.0 mg of water
3.0 moles of CO
3.0x1022 molecules of nitrogen gas
Estimate the number of moles of hydrogen in 176g of pentanol, C5H11OH. The molar mass of pentanol is 88g/mol.
12 mol H
24 mol H
144 mol H
72 mol H
An Olympic medal contains 71.5% of gold by mass. How much gold could be extracted from a medal that weighs 115 grams?
0.417 mol
0.817 mol
1.33 mol
14.1 mol
What is the mass of 31.8 L of ammonia gas, NH3, at STP?
24.2g
48.4g
17.0g
34.1g
An ideal gas is contained in a 5.0L chamber at a temperature of 37°C. If the gas exerts a pressure of 2.0atm on the walls of the chamber, which of the following expressions is equal to the number of moles of the gas? The gas constant, R, is 0.08L∙atm∙mol1-∙K1-.
What is the molarity of the individual ions in a 1.4 M solution of calcium nitrate, Ca(NO3)2?
both concentrations are 1.4M
both concentrations are 2.8M
1.4 M Ca2+ and 2.8M NO31-
2.8M Ca2+ and 1.4M NO31-
A substance is determined to be 24.27% carbon, 71.65% chlorine, and 4.07% hydrogen. What is its empirical formula?
CClH2
C2Cl2H
C2Cl2H4
C4Cl4H2
A 45g sample of a compound containing only carbon and hydrogen is found to contain 36g of carbon. It has a molar mass of 30.0g/mol. What is its molecular formula?
CH3
C3H8
C2H6
C2H4
