((8 - 7.28)/7.28) x 100 = 9.89%
If some of the hydrate splatters out of the crucible, the calculation of the percent of water would be lower. This is because some of the hydrate (which contains water) has been lost, so the total amount of water present in the sample is reduced.
For a chemical compound, ex. ABC: Percent (%) of A is (atomic weight of A x 100)/molecular weight of ABC.
Accepted density refers to the specific density value that is commonly agreed upon or widely recognized as a standard for a particular substance. This value can be used as a reference point for comparison or verification purposes in various scientific or industrial settings.
First, understand the the percent composition of air does not change at 8000 ft. The oxygen, which is what you need to stay alive, is 21% at sea level and at 8000 ft. The density of air is what decreases as you get higher. So even thought at 10,000 feet the air is still 21% oxygen, a given breath of air, contains so few oxygen molecules that you cannot stay mentally alert. Think of a breath of air at 10,000 feet as very dilute air, with lots of empty space between the molecules. Now many jet airplanes pressurize to 8000 feet which is where that number mostly likely came from in the question. The question asks about the percent of air at 8000 feet. If we assume no humidity and we assume temperature of 70 degree ( both those things affect air density so we need to pick some levels and those are reasonable and easy for the calculation) the air density is .0554 lbm/ft3 . The density at 0 feet given the same conditions is .0745lbm/ft3 We can look at the ratio of .0554/.0745 is about 74% so the percent of "air" is about 74% at 8000 feet if we use 0 feet as 100%. If we use 30% relative humidity for both 0 and 8000 feet, the percent does not change. There is a link for calculation air density attached to this answer.
Mars has a density of about 71% that of Earth. This difference in density is mainly due to variations in the composition and size of the two planets. Mars is smaller and has a different internal structure compared to Earth.
To find the percent of 75 out of 100 students, you divide 75 by 100 and then multiply by 100. This calculation gives you 75%. Therefore, 75 out of 100 students is 75%.
The percent composition by mass of a compound is determined by dividing the mass of each element in the compound by the total mass of the compound, then multiplying by 100 to get the percentage. This calculation gives the proportion of each element in the compound by mass.
10 percent of 60 students is 6 students.
45.
72 is 80 percent of 90.
12.4%
easy 58 because 30+12=42 100-42=58
10 percent of students go out instead of use electronic devices
40 x 0.30% = 12
gaga si cherywel
13 students = 1300 %
Calculation: 28800 x 0.15 = 4320 Therefore, 15 percent of 28800 is 4320.