A mixture of 3 gases has a total pressure of 1270 mmHg. The pressure of Gas 1=520 mmHg and the pressure of Gas 2=310 mmHg. What is the pressure of Gas 3

Using the periodic table, complete the table to describe each atom. type in your answers

Agroup of students is studying convection current. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other is in an area with warm air. after 10 minutes, the balloon are released from a height of 1 meter. which of the following to the students most likely observe? a) the warm balloon expands and rises. the cold balloon shrinks and sinks b) the balloon both rise. the cold balloon is larger than the warm balloon c) the cold balloon expands and rises. the warm balloon shrinks and sinks d) the balloon rise at the same rate. both balloons are the same size

How many moles is 14.5 cm^3 of platinum? the density of platinum is 21.45 g/cm^3.