Answer:
It's the 4th one. waves are created by the wind
The density of the material is 2.66 g/mL and it is likely this is made of Aluminum
Explanation:
The first step to know the material of the chunk of metal is to calculate its density. The general formula for density is P (density) = . Moreover, in this case, it is known the mass is 37.28 g, but the volume is not directly provided. However, we know the water in the graduated cylinder had a volume of 20.0 mL and this increased to 34.0 mL when the chunk of metal is added, this means the volume of the metal is 14 mL (34.0 mL - 20.0 mL = 14 mL). Now let's calculate the density:
This means the density of this metal is 2.66 g/mL, which can be rounded as 2. 7 g/mL, and according to the chart, this is the density of aluminum. Therefore, this material of this chunk is aluminum.
To calculate the number of molecules in a given sample, we need to know what the molecular formula of the substance (which we do), and how many moles of it are present
To calculate the number of moles, we have to divide the mass of the substance (in grams) by its molecular mass
So, in this case, the molecular mass is 55.8 + 3(19) = 112.8
So, the number of moles of FeF3 is = 24/112.8 = 0.213 moles
Once we have the number of moles, we must multiply this value by a number called Avogadro's Constant, which tells us how many atoms/molecules/ions are present in 1 mole of any substance
Avogadro's constant is approximately equal to 6.022 x 10^23
So, there are approximately 0.213 x 6.022 x 10^23 = 1.281 x 10^23 molecules of FeF3 in 24 grams of FeF3
