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ashvinmsingh
03.07.2019 •
Mathematics
You need to strengthen a 19% alcohol solution with pure alcohol solution to obtain 40% solution. how much pure alcohol should you add to 100 milliliters of the 19% solution. can anyone solve this
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Ответ:
I will add the mm to express the volume in mm
100mm.(19%) + (100%).x mL = (100 mL+x mL).(40%).
Now right again without the %
100.(0.19) + x.(1) = (100+x).(0.4)
19 + x = = 40 + 04x
x - 0.4x = 40 - 19
0.6 x = 21
x = 21/0.6 and x = 35 mL. This te quantity of pure alcohol should to be added to get a solution at 40%.
Ответ:
The sine of the angle = the length of the opposite side. the length of the hypotenuse.
or sin 60 = √3/2