One laboratory reagent use to differentiate between Agcl and Agl

Which statement best describes what happens when molecular compounds melt

What is the volume of 2.5 moles of nitrogen gas (n2)at standard temperature and pressure (stp)?

What is the relative mass of an electron? a) 1/1840 the mass of a neutron + proton b) 1/1840 the mass of an alpha particle c) 1/1840 the mass of a c-12 atom d) 1/1840 the mass of a hydrogen atom