Which of the items below would be considered the densest? (Show your step-by-step work for calculating density of each, in the units of g/mL, to support of your final answer) A piece of wood with a volume of 2.5 L and a mass of 12.5 kg
A ball with a volume of 139 mL and a mass of 93 g
A tire with a volume of 2.12 L and a mass of 4.22 x 104 mg
A wire with a volume of 3.91 x 10-7 L and a mass of 7.93 x 10-1 ng
A block of metal with a volume of 1350 mL and a mass of 1.29 x 103 g

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%

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explanation:

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o conteúdo de calor de um sistema é igual à entalpia apenas para um sistema que é constante

the formula mass of a molecule or a compound is the sum of the atomic weights of the atoms in its empirical formula

(that's what i know about formula mass)