Magnesium (mg) is a valuable metal used in alloys, in batteries, and in the manufacture of chemicals. it is obtained mostly from seawater, which contains about 1.30 g of mg for every kilogram of seawater. calculate the volume of seawater (in liters) needed to extract 5.33 × 104 tons of mg. seawater has a density of 1.03 g/ml. (1 ton = 2000 lb; 1 lb = 453.6 g) enter your answer in scientific notation.

Respuesta :

Given that, 1.30 g of mg per kg (1000 g) of sea water.

Convert [tex] 5.33\times 10^{4}tons [/tex] into gram.

1 ton = 2000 lb

Thus,

[tex] 5.33\times 10^{4}tons [/tex]  = [tex] 2000 lb \times5.33\times 10^{4}tons [/tex]

= [tex] 10660 \times 10^{4} lb [/tex] = [tex] 1.0660 \times 10^{8} lb [/tex]

1 lb = 453.6 g

Thus,

[tex] 1.0660 \times 10^{8} lb [/tex] = [tex] 1.0660 \times 10^{8}\times 453.6 g [/tex]

= [tex] 483.5376 \times 10^{8} g [/tex] = [tex] 4.83 \times 10^{10} g [/tex]

Now,

1.30 g of magnesium is present in  1000 g of seawater.

Thus, 1 g of magnesium present in [tex] \frac{1000 g}{1.30} [/tex] of seawater.

[tex] 4.83 \times 10^{10} g [/tex] of magnesium present in [tex] 4.83 \times 10^{10} g\times \frac{1000 g}{1.30} [/tex] =  [tex] 3715.38 \times 10^{10} g [/tex]

= [tex] 3.715 \times 10^{13} g [/tex] of seawater.

Now, density of sea water is [tex] 1.03 g/ml [/tex]

Density is equal to the ratio of mass and volume.

[tex] Density =\frac{Mass}{Volume} [/tex]

Put the value of density and mass to find the volume:

[tex] 1.03 g/ml =\frac{3.715 \times 10^{13} g}{Volume} [/tex]

Volume = [tex]\frac{3.715 \times 10^{13} g}{1.03 g/ml} [/tex]

Volume = [tex] 3.606\times 10^{13}ml [/tex]

Now, convert ml into L:

1 L = 1000 ml

Volume in L = [tex] \frac{3.606\times 10^{13}}{1000 ml} [/tex]

= [tex] 3.606\times 10^{10}L [/tex]

Thus, volume in litres = [tex] 3.606\times 10^{10}L [/tex]