Chapter 1
Determine the number of significant figures of 0.0580 m3
Three
Write the formula for the molecular compound: sulfur tetrafluoride
SF4
What is the molecular mass of citric acid, H3C6H5O7?
192.12 amu
Convert 77K, the boiling point of liquid nitrogen, to degrees Celsius
-196.15OC
Calculate the number of neutrons in 239Pu
145
How many moles of magnesium (Mg) are there in 87.3g of Mg?
3.59 moles
The density of platinum is 21.45 g/cm3. What is the volume of a platinum sample with a mass of 11.2 g?
0.522 cm3
What is the empirical formula for caffeine (C8H10N4O2), a stimulant found in tea and coffee?
C4H5N2O
Calculate the number of moles of chloroform (CHCl3) in 198 g of chloroform?
1.66 moles
Four mass measurements of a metal cube were made using a laboratory balance. The results are 24.02 g, 23.99 g, 23.98 g, and 23.97 g. The actual mass of the metal cube is 25.00 g. Are the mass measurements accurate? Are the mass measurements precise?
Accurate: No
Precise: Yes
Give the number of protons and electrons of Mn2+
Protons: 25
Electrons: 23
Determine which of the following contains the largest numbers of atoms:
7.68 g of He
112 g of Fe
389 g of Hg
112 g of Fe
What is the volume in L of a 1.24 kg sample of benzene (density = 0.876 g/mL)?
1.42 L
What is the symbol and charge for an ion containing 24 protons and 22 electrons?
Cr2+
How many oxygen atoms are in 124 g of calcium phosphate, Ca3(PO4)2?
1.93 x 1024 O atoms