A silver cube with an edge length of 2.26 cm and a gold
cube with an edge length of 2.70 cm are both heated to
89.6 °C and placed in 115.0 mL of water at 20.0°C.
What is the final temperature of the water when thermal
equilibrium is reached?
Substance
gold
silver
water
Specific heat (J/g.°C)
0.1256
0.2386
4.184
Density (g/cm)
19.3
10.5
1.00

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%

practical process described pest part of scientific investigation.

because practical knowledge is powerful then therotical knowledge.

what is the question here. i think you messed up.