How many molecules of HCI would react with 2 moles of Al? 2Al + 6HCI → 2AlCl3 + 3H2
A. 6.02 x 1023
B. 1.806 x 1023
C. 2.007 x 1023
D. 1.806 x 1024

An artificial satellite circles the earth in a circular orbit at a location where the acceleration due to gravity is 6.03 m/s^2. determine the orbital period of the satellite.

Photoelectrons with a maximum speed of 6.50 x 107 m/s are ejected from a surface in the presence of light with a frequency of 6.75 x 1014hz. if the mass of an electron is 9.10 x 10-31 kg, calculate in joules the maximum kinetic energy of a single electron. 3.84 x 10-15 j 1.92 x 10-15 j 5.92 x 10-23 j 3.07 x 10-16 j

Suppose you increase your walking speed from 7 m/s to 13 m/s in a period of 2 s. what is your acceleration?