I have another question similar to the last one. Ok The question tells me that the density of vinegar is 1.01g/mL and to calculate the mass of the vinegar sample, and the find the percent by mass of acetic acid in the simple. Now I know density= mass/ volume, and they give me the mass, the volume is 25mL as that is how much vinegar i used. So would i just rearrange it to find the answer? Also what does it mean when it says find the percent by mass of acetic acid in sample? Do they want me to once I found the mass of the vinegar divide the mass of the acetic acid which i found in last question to be 0.948g, by the mass of the vinegar?