In an experiment a spot 1.0 cm in diameter contains about 12 microleters of solution. If the Fe(NO3)3 solution contains about 6.0 g Fe3+ per liter how many nanograms of Fe3+ ions are there in a 1.0 cm diameter spot og Fe(NO3)3

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

In the space, show a correct numerical setup for calculating the number of moles of co2 present in 11 grams of co2

8.98 dm3 of hydrogen gas is collected at 38.8 °c. find the volume the gas will occupy at -39.9 °c if the pressure remains constant.