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Percent Composition
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What is the percent composition of a compound that contains 17.6 g of iron and 10.3 g of sulfur has a total mass of 27.9 g compound?
The percent by mass of iron in the stated compound is 100(17.6/27.9) or 63.1 %, to the justified number of significant digits. Since the compound contains only two elements, the percent by mass of sulfur is 100 - 63.1 or 36.9 %. To find the atomic percentages rather than the mass percentages, the mass for each element must be divided by the gram atomic mass of that element. 17.6 grams constitutes 17.6/55.457 or about 0.313 gram atoms of iron, and 10.3 grams of sulfur constitutes 10.3/32.06 or about 0.321 gram atoms of sulfur. The atomic ratios of the two elements in simple binary compounds such as iron sulfide must have ratios of small whole numbers. The specified compound contains about equal numbers of iron and sulfur and therefore has the formula FeS.
If 230 g sample of a compound contains 136.6 g of carbon 26.4 g of hydrogen and 31.8 g of nitrogen The rest is oxygen What is the mass percent of oxygen in the compound?
The mass of the elements that are not oxygen equals 194.8g. The mass of oxygen is 230g - 194.8g = 35.2g of oxygen. Mass percent of oxygen = 35.2g O/230g x 100 = 15% O
What is the percent composition of O in LiOH?
The formula shows that oxygen is one atom out three in the formula unit, so that the atomic percent of oxygen in the compound is 33.333.......... By adding the gram atomic masses of the three elements, one obtains 23.95 as the gram formula mass, to the justified number of significant digits (the four digits in the value for the gram atomic mass of lithium), and 100 (15.9994/23.95) is 66.80 percent by mass of oxygen in LiOH.
What is the percent composition of the compound that forms when 222.6 g N combines completely with 77.4 g O?
The total mass is 222.6 + 77.4 = 300.0 g. The percent of nitrogen is therefore: 100(222.6/300.00) = 74.2 %. By difference, the percent of oxygen is 25.8 %.
What are Elements discovered in the last 100 years?
which elements were discovered in the last 100 years
What must the sum of all the percent be?
The sum of all percent must be 100
What is the formula for the percent by mass of a compound?
((mass of element)/(mass of compound))*100
What is the percent composition of a compound that contains 17.6 g of iron and 10.3 g of sulfur has a total mass of 27.9 g compound?
The percent by mass of iron in the stated compound is 100(17.6/27.9) or 63.1 %, to the justified number of significant digits. Since the compound contains only two elements, the percent by mass of sulfur is 100 - 63.1 or 36.9 %. To find the atomic percentages rather than the mass percentages, the mass for each element must be divided by the gram atomic mass of that element. 17.6 grams constitutes 17.6/55.457 or about 0.313 gram atoms of iron, and 10.3 grams of sulfur constitutes 10.3/32.06 or about 0.321 gram atoms of sulfur. The atomic ratios of the two elements in simple binary compounds such as iron sulfide must have ratios of small whole numbers. The specified compound contains about equal numbers of iron and sulfur and therefore has the formula FeS.
What are the oxidation numbers of the elements in the following compound of Fe2O3?
100 will be oxidation no.in Fe2O3.
What percent of 100 is 10?
10 percent of 100 is 10. Basically to find the number that is a percentage of another number, you just need to multiply them together. However, just remember that you must convert the percentage to a decimal and to convert, you must divide the percentage by 100.
Why does the number of elements in your body not equall 100 percent?
The number of elements in your body is not a percentage. It is a number. And equal has one "l".
How find percent compsotion of oxygen in Na2O?
To find the percent composition of oxygen in Na2O, find the total molar mass of the compound. Then, divide the molar mass of oxygen by the molar mass of the compound, and multiply by 100% to get the percent oxygen.
What is 0.0005 in a percent?
The question is: What is 0.0005 in a percent? We must always remember that percent is ALWAYS of 100. Therefore, 0.0005 as a percent would be 0.0005 multiply by 100, or simply put,(0.0005) x ( 100), which is equal to 0.005%. or .005/100%.
What two elements comprise almost 100 percent of the matter in the universe?
Hydrogen and helium make up nearly 100 percent of the matter of the universe. Hydrogen comprises about 75 percent and helium makes up about 25 percent.
If 230 g sample of a compound contains 136.6 g of carbon 26.4 g of hydrogen and 31.8 g of nitrogen The rest is oxygen What is the mass percent of oxygen in the compound?
The mass of the elements that are not oxygen equals 194.8g. The mass of oxygen is 230g - 194.8g = 35.2g of oxygen. Mass percent of oxygen = 35.2g O/230g x 100 = 15% O
How is the percent composition by mass determined?
For a chemical compound, ex. ABC: Percent (%) of A is (atomic weight of A x 100)/molecular weight of ABC.
How is percent composition by mass determined?
For a chemical compound, ex. ABC: Percent (%) of A is (atomic weight of A x 100)/molecular weight of ABC.
