Report your answer with the proper number of significant figures. Magnesium is used in lightweight alloys for airplane bodies and other structures. The metal is obtained from seawater in a process that includes precipitation, neutralization, evaporation, and electrolysis. How many kilograms of magnesium can be obtained from 4.29 km3 of seawater if the initial Mg2 concentration is 0.19% by mass

8.47 * 10^9 Kg

Explanation:

Density of sea water = 1040 kg/m^3

mass of sea water = ?

Volume of sea water = 4.29 * 10^3 m^3

Mass of sea water = 1040 kg/m^3 * 4.29 * 10^9 m^3

Mass of sea water = 4.46 * 10^12 Kg

Mass of Mg2+ =  0.19% by mass

So;

Mass of Mg2+ =0.19/100 * 4.46 * 10^12 Kg

Mass of Mg2+ = 8.47 * 10^9 Kg

passed in september 1935, these laws are known as nuremberg laws.   they forbid jews from marrying but not directly forced them to divorce aryans. what is most noticeable is the fact that the jews were defranchised, meaning by this that they were not expected to have any civil rights, including the right to vote. the right answer is deprived of the right to vote.

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.