Calculate the number of molecules present in 0.750 mol of MgO

Hey there!

There are 6.022 x 10²³ molecules in 1 mole.

We have 0.750 moles, so multiply.

0.750 x 6.022 x 10²³ = 4.52 x 10²³

There are 4.52 x 10²³ molecules of MgO in 0.750 moles.

Hope this helps!

under a microscope, cancer cells may look very different from normal cells. they often have different sizes and some may be larger than normal while others are smaller. cancer cells are often abnormally shaped and the control centre of the cell (the nucleus) may have an abnormal appearance.

i think? ?

a). in this case, dh> 0 and sd> 0. if t becomes larger, the term "-tds" will become more negative. at some point, it is possible that -dts will be more negative than the dh is positive, and the reaction will become spontaneous. this is probably the correct answer, but you should look at all of the other possibilities and make sure of that.