The common Eastern mole, a mammal, typically has a mass of 75 g, which corresponds to about 7.5 moles of atoms. (A mole of atoms is 6.02 * 1023 atoms.) In atomic mass units (u), what is the average mass of the atoms in the common Eastern mole?

The micrometer (1 µm) is often called the micron. (a) How many microns make up 5.5 km? (b) How many centimeters equal 5.5 µm? (c) How many microns are in 5.5 yd? (a) Number i Units (b) Number i Units (c) (c) Number i Units

If you used only a keyboard to enter data, how many years would it take to fill up the hard drive in your computer that can store 95gigabytes95gigabytes (95×109bytes95×109bytes) of data? Assume "normal" eight-hour working days, and that one byte is required to store one keyboard character, and that you can type 180 characters per minute. Express your answer using two significant figures.