Question

percent composition by mass of core​

Answer 1

Answer:

Compounds are made up of two or more elements. The law of definite proportions tells us that the proportion, by mass, of elements in a compound is always the same. Water, for example, is always 11% hydrogen and 89% oxygen by mass. The percentage composition of a compound is the percentage by mass of each element in the compound.

Percentage composition can be determined experimentally. To do this, a known quantity of a compound is decomposed in the laboratory. The mass of each element is measured and then divided by the total mass of the original compound. This tells us what fraction of the compound is made up of that element. The fraction can then be multiplied by 100% to convert it into a percent.

Example:

Laboratory procedures show that 50.0 grams of ammonia, NH3, yields 41.0 grams of nitrogen and 9.00 grams of hydrogen upon decomposition. What is the percent composition of ammonia?

Solution:

% nitrogen=(41.0 grams50.0 grams)⋅(100%)=82%% hydrogen=(9.00 grams50.0 grams)⋅(100%)=18%

Answer 2

QUESTION:-

Percent composition by mass of core

ANSWER:-

• The core and mantle are nearly proportional in thickness, the core certainly forms only 15 percent of the volume of Earth, whereas the mantle forms 84 percent.

• Percent composition by mass of core gives an account of by mass what percent of each element is present in a compound.

• A chemical compound is the mixture, combination or blends of two or more elements. When one studies a chemical compound one may want to find and know the composition percent of a particular element within that chemical compound.

• The equation for percent composition is the mass of the core element divided by the molecular mass and multiplied by 100 (mass of element/molecular mass) x 100.

• To know the percent composition of the elements in a compound first we need to find the molar mass of all the elements in the compound in grams per mole then find the molecular mass of the whole compound which divides the component's molar mass by the entire molecular mass and lastly multiply the outcome with 100 to get the percent of composition by mass of the core

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