Two hundred grams of a substance requires 9.76kj of heat to raise its temperature from 25 c to 45 c. it has a specific heat of 2.44j/g. use the table to identify the substance.
a ethanol
b gasoline
c ice
d air
i think it's gasoline!

First, we need to get the mass of the copper, then we will use this mass along with the given density to find the volume and finally we will substitute in the rule of volume to get the radius.

First, calculating the mass:
number of atoms in one mole of an element = 6.022 x 10^23
So, we can use cross multiplication to find the number of moles containing 1.41×10^24 atoms as follows:
number of moles = (1.41×10^24 x 1) / (6.022 x 10^23) = 2.3414 moles
From the periodic table:
molar mass of copper = 63.5 grams
number of moles = mass / molar mass
2.3414 = mass / 63.5
mass = 2.3414 x 63.5 = 148.6789 grams

Then, we get the volume:
density = mass / volume
8.96 = 148.6789 / volume
volume = 16.59 cm^3

Finally, we get the radius:
volume = (4/3) x pi x (radius)^3
16.59 = (4/3) x (22/7) x (radius)^3
radius^3 = 3.9614
radius = 1.5822 cm