Convert 2.80 x 1023 molecules of F2 to moles. (Molar Mass = 38.00 g/mole) A: 1.69 x 1047 mol F2
B: 4.56 mol F2
C:0.465 mol F2
D:2.15 mol F2
(please help)

In all living cells dna controls cellular activities by

How is 0.00235 expressed in proper scientific notation? a. 2.35 × 10-3 b. 0.235 × 10-2 c. 2.35 d. 2.35 × 103

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.