On the simplifying assumption that oxygen and carbon atoms have the same weight, how many tons of ca

1:On the simplifying assumption that oxygen and carbon atoms have the same weight, how many tons of carbon dioxide gas are formed when  tons of coal burns (coal is nearly pure carbon)?


2:In a typical large coal-fed electrical generating plant, 1.2 tons of coal are burned every 8 seconds. On the simplifying assumption that oxygen and carbon atoms have the same weight, about how many tons of carbon dioxide enter the atmosphere every hour from such a plant (coal is nearly pure carbon)?





3:The distance to the moon is 384,000 km. Express this using scientific "e-notation".

How far is this in meters?

How far is this in millimeters?


4:The universe is a million trillion seconds old. Write this number in ordinary (not powers of 10) notation.