Evaluate each of the following, and write the answer to the appropriate number of significant figures. a. 149.2 _ 0.034 _ 2000.34 b. 1.0322 _ 103 _ 4.34 _ 103 c. 4.03 _ 10_2 _ 2.044 _ 10_3 d. 2.094 _ 105 _ 1.073 _ 106

Chemistry 111 Notes (Dr.Patton) STP Definition: (Standard Temperature and Pressure) the volume occupied by one mole of any gas is 22.4L which is known as the standard molar volume EXAMPLE: The volume of .280L of gas has a mass of .400g @ STP. What is the molar mass of the gas Write the equation of molar mass then plug in given... Molar mass= mass/moles =.400g/ moles We can find the amount of moles by using a conversion factor of liters to moles. Remember @ STP there is 22.4 liters in one mole… .280L x 1 mol/22.4L=.012494 moles Now we can plug in .012494 into our molar mass equation above… Molar mass=.400g/.012494 =32.01 g/