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So, I first converted the 225 mg. of cisplatin to grams and used the molar mass to convert the grams to moles of cisplatin. I then used the molarity= moles of solute/volume in liters equation to get the volume in liters I needed; plugging in the given molarity and the calculate moles of solute.
Since they gave you mass in mg and they have you and molarity, you know to use the equation M=(moles)/Liters. Usually, you would use M1V1=M2V2 when they give you three values or when the question specifically has the word dilute in it. So, you would take the mg and make it into grams them use the molar mass to get it into moles. Using this information, you would solve for liters, 1.8x10^-4 = (0.000850)/L = 4.72 L
The equation was for molarity which is M (molarity) = (moles)/(liters). If you have different measurements like mg you need to convert, so for question seven you needed to plug in the values after converting mg to liters.
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