Look at the pic. I don't know the reason why it should be
7/2 when matching O of this.
You can see why the numerator is 7.
But I don't know why the denominator is 2.

teach me please!

Which three statements represent the benefits of performing experiments using computer simulations?

The density of benzene at 15 °c is 0.8787 g/ml. calculate the mass of 0.1500 l of benzene at this temperature. enter your answer in terms of grams

Asolution of naoh has a concentration of 25.00% by mass. what mass of naoh is present in 0.250 g of this solution? use the periodic table in the toolbar if needed. 0.0625 g what mass of naoh must be added to the solution to increase the concentration to 30.00% by mass? g