+66 Hello, I need help with this (and some other, I'm new at these type of problems):
1. On the label of a bottle of vinegar, the information appears: "acetic acid solution at 4% by weight". If the bottle contains 750mL of vinegar and its density is 1.006g / mL, calculate the mass of acetic acid contained in the bottle.
2. A hospital organized a blood donation event where 80 pints of blood were collected. The hospital expected to get 8 gallons of blood with the event. Has the goal been met?
1pt = 473mL
1 gal = 3785 mL
Also, I don't know if these include conversions but, conversions are one thing my brain doesn't seem to understand at all. 
+130071 1. On the label of a bottle of vinegar, the information appears: "acetic acid solution at 4% by weight". If the bottle contains 750mL of vinegar and its density is 1.006g / mL, calculate the mass of acetic acid contained in the bottle.
Density = Mass / Volume ..... which means that .....
Volume * Density = Mass
So....for the liquid in the bottle we have that
750 ml * 1.006 g / ml = Mass [ the "ml" cancels ]
750 * 1.006 g =
754.5 g .... this is the mass ["weight "] of the liquid .....
And the acetic acid is 4% of this
So........the mass ["weight"] of the acetic acid is 4% of this...so
.04 * 754.5 =
30.18 g
+130071 2. A hospital organized a blood donation event where 80 pints of blood were collected. The hospital expected to get 8 gallons of blood with the event. Has the goal been met?
1pt = 473mL
1 gal = 3785 mL
80 pints = 80 * 473 ml = 37840 ml
8 gal = 8 * 3785 = 30280 ml
The goal has been met !!!!
+66 Thank you so so much!
I struggle with this and most of the times I don't know where to start.
+118690 2. A hospital organized a blood donation event where 80 pints of blood were collected. The hospital expected to get 8 gallons of blood with the event. Has the goal been met?
Why would you convert to metric?
There are 8 pints in a gallon (I expect you are from the U.S. and you are supposed to know this)
so 8 gallons = 64 pints
They expected 64 they got 80 so YES they were happy :) The goal was not only met it was exceeded.
+118690 1. On the label of a bottle of vinegar, the information appears: "acetic acid solution at 4% by weight". If the bottle contains 750mL of vinegar and its density is 1.006g / mL, calculate the mass of acetic acid contained in the bottle.
It is easy, you can cancel the mL units out !
The only other thing you need to know is that mass can be measured in grams
\(Total\;mass\;=750mL*\frac{1.006g}{1mL}=750*1.006g = 754.50g\\ Mass\;of\;acid\;\;=\frac{4}{100}*754.5g=30.18grams \)
