101. Convert the following to mass in gram a. 4.22 x 1015 atoms U
b. 8.65 X 1025 atoms H
c. 1.25 x 10-2 atoms 0
d. 4.44 X 102 atoms Pb

Calculate the molar mass of aluminum oxide (al2o3). express your answer to four significant figures.

Design techniques and materials that reduce the negative environmental impact of a structure are referred to as

Alidded glass container is filled with a colored gas. after a period of time, it is observed that the gas is uniformly spread throughout the box and that the movement has slowed considerably. next, a warm iron plate is carefully placed under the box. why is there resumed movement of the gas in the container?