Anasa satellite showed that in 2009 the ozone hole over antarctica had a maximum surface area of 24.1 million square kilometers. the largest ozone hole on record occurred in 2006 and had a surface area of 29.6 million square kilometers. calculate the difference in diameter (in meters) between the ozone hole in 2009 and 2006.

To find the diameter you can approximate the shape of the hole to a circle.

Tha area of a circle is π(r^2)

Then, area in 2009 = 24.1 * 10^6 km^2 => (r^2) = 24.1*10^6 km^2 / π = 7.67 * 10^6 km^2 => r = 2.77*10^3 km => diameter = 5.54*10^3 km 

Area in 2006 = 29.6*10^6 km^2 => (r^2) = 29.6*10^6 km^2 / π = 9.42*10^6 km^2 => r = 3.07*10^3 km => diameter =  6.14*10^3 km

Difference in diameters: 6.14 * 10^3 km - 5.54 * 10^3 km = 0.6 km = 600m

600 m

53.5g of NH4Cl

Explanation:

First, we need to obtain the number of mole of NH4Cl. This is illustrated below:

Volume = 0.5L

Molarity = 2M

Mole =?

Molarity = mole /Volume

Mole = Molarity x Volume

Mole = 2 x 0.5

Mole = 1mole

Now, let us convert 1mole of NH4Cl to gram. This is illustrated below:

Molar Mass of NH4Cl = 53.5g/mol

Number of mole = 1

Mass =?

Number of mole = Mass /Molar Mass

Mass = number of mole x molar Mass

Mass = 1 x 53.5

Mass = 53.5g

Therefore, 53.5g of NH4Cl is contained in the solution.