12.01 g of carbon contains 6.02 _ 1023 carbon atoms. What is the mass in grams of 1.89 _1025 carbon atoms?

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/