The density of a liquid can be determined by weighing a known volume of the liquid in a graduated cylinder. the data from the experiment is as follows: weight of cylinder 10.4 grams; weight of cylinder and liquid 11.7 grams; reading from cylinder 6.2 ml. calculate the density of this liquid using the data.

- density of the liquid is 0.21 gram per mL.

Solution:-

From given data, mass of cylinder = 10.4 g

mass of cylinder along with liquid = 11.7 g

So, mass of liquid = 11.7 g - 10.4 g = 1.3 g

Volume of liquid = 6.2 mL

Let's divide the mass by the volume to get the density of the liquid:

density =

So, the density of the liquid is 0.21 gram per mL.

is there multiple choice answers?

answer: the enthalpy of the overall chemical reaction is +87.88 kj or +88 kj.

according to hess's law, the overall enthalpy of a reaction is the difference between the sum of enthalpy values of all the products and the sum of enthalpy values of all the reactants.

δh(reaction) = ∑nδh(products) - ∑nδh(reactants)

δh(reaction) = [δh +δh] - [δh]

δh(reaction) = [1(-287.02) + 1(0) ] - [1(-374.9)] kj = +87.88 kj

here, δh (pcl3) = -287.02 kj, δh(cl2) = 0, δh(pcl5) = -374.9 kj

therefore, enthalpy of the overall reaction is +87.88 kj or +88 kj.