21. Which of the following entities has the greatest mass?
a. One atom of aluminum
b. One molecule of fluorine
c. One atom of phosphorus
d. One molecule of methane

Ascientist measures the speed of sound in a monatomic gas to be 449 m/s at 20∘c. what is the molar mass of this gas?

Astudent pours 10.0 g of salt into a container of water and observes the amount of time it takes for the salt to dissolve. she then repeats the process using the same amounts of salt and water but this time she slowly stirs the mixture while it is dissolving. the student performs the experiment one more time but this time she stirs the mixture rapidly. the dependent variable in this experiment is: time for salt to dissolve speed of stirring amount of water mass of salt

Is 343 in the sequence -5, -2, 1, 4, 7