12. When a 120 g sample of aluminum is placed in 250 g of water the temperature increases from 25°C to 115°C. Find the energy per gram of aluminum. A. Find the percent efficiency per gram if the theoretical yield was 8500 J/g.

answer by yourhope:

how do models compare to real-world objects?

d. most models represent a real-world object in a simpler way.

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that's what i got you can count the number of atoms

the density of gold = 19.3 g/cm3

the relation between density and mass and volume is

density = mass / volume

given :

mass of gold = 13 g

density = 13g / volume = 19.3

volume = 13 /19.3 = 0.67 cm^3

thus volume of gold nugget = 0.67 cm^3