What is the mass of 37 ml but has the density of 0.79 g/ml

From the information given, it is not clearly stated that the substance is a liquid but because the measurement has been indicated that it is 37ml. then we will assume this is a liquid. The density of the liquid is 0.79g/ml.

mass = density × volume

mass = 0.79g/ml × 37ml

mass = 0.79 × 37

mass = 29.23

Therefore the mass is 29.23 grams.

Mass is directly proportional to volume and density. If either density or volume  increases then mass increases also.

metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

if it's not useful, feel free to report for mistake in answer.