Using your knowledge of properties of matter, choose the correct description: Question 3 options: physical prop. are luster, color & reactivity Chemical prop. are conductivity, flammability & reactivity Chemical prop. are tarnishing, flammability & reactivity physcial prop are malleability, conductivity & rusting

1. for the first question, we must find the mass of the anhydrous salt, mgso₄. the molar mass for mgso₄·7h₂o is 246.47 g/mol, while that of mgso₄ is 120.37 g/mol.7.834 g mgso₄·7h₂o * 1 mol mgso₄·7h₂o/246.47 g * 1 mol mgso₄/1 mol mgso₄·7h₂o * 20.37 g mgso₄/mol = 0.647 g mgso₄

2. mass of water = mass of sample - mass of anhydrous salemass of water = 7.834 - 0.647 = 7.19 gpercent water in hydrate = 7.19/7.834 * 100 = 91.74%

distance, luminosity, brightness, radius, chemical composition, and temperature

i'm pretty sure it is letter c.) car