The solvent acetone was poured into a glass container, and the combined mass of the container plus acetone was found to be 409.7 g. the mass of the empty container was 260.16 g, and the volume of acetone was 189 cm3. (to keep track of significant figures during each calculation, underline the last significant figure in each number in the calculation.)

(a) find the mass of acetone in the container by subtracting 260.16 g from 409.7 g, and report the result with the appropriate number of significant figures.

(b) calculate the density of acetone by dividing the mass obtained from part (a) by the volume 189 cm3, and report the result with the appropriate number of significant figures.

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)

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nacl or sodium chloride is an ionic compound. this is because an ionic compound pertains to a compound that consists of positively and negatively charged ions. in this case, na (sodium) has a tendency to lose one electron when it reacts with with other atoms, so the resulting sodium ion contains 11 protons and 10 electrons, thus making it positively charged (na+), when chlorine reacts, it usually gains one electron to form an ion called chloride, thus making it negatively charged ( since the ions are oppositely charged, they attract.