Katlynne

There's 60 minutes in an hour, right? So convert 7 hours into minutes (7 * 60) and add the 20 minutes to that. 420 + 20 = 440 minutes in her school day.

Okay so first you need the dissociation constant for carbonic acid (HCO3) which is 5.6e-11. Then set up an ice table. Keep in mind that you are adding an acid to an aqueous solution of sodium bicarbonate (Na2CO3) which means you will have some CO3 ions al...

Moles = grams/molar mass

Moles= grams/molar mass rearranging you get grams = moles * molar mass

Use a unit circle and special triangles. At 5pi/6 on a unit circle, cosx= -sqrt3/2 and sinx=1/2. Since tan=sin/cos, if you plug in the values and rationalize it comes out to be -sqrt3/3.