Percent Composition
The percent composition of NaCl.
What is 39.34% Na, 60.66% Cl?
The percent mass of water in RbAt x 2H2O.
What is 10.87% water?
The percent of hydroxide in LiOH.
What is 71.02% OH?
The empirical formula of 12.05 g C and 1.01 g H.
What is CH?
The molecular formula of caffeine which has the following percent composition: carbon 49.48%, hydrogen 5.19%, oxygen 16.48% and nitrogen 28.85% and a molar mass of 194.19 g/mol.
What is C8H10N4O2?
The percent composition of BaBr2.
What is 46.22% Ba, 53.78% Br?
The mass percent of water in RaCl2 x 5H2O.
What is 23.28% water?
The percent phosphate in AlPO4.
What is 77.87% PO4?
The empirical formula of a compound that is 73.9% mercury and 26.1% chlorine by mass.
A major textile dye manufacturer developed a new yellow dye. The dye has a percent composition of 75.95% C, 17.72% N, and 6.33% H by mass with a molar mass of about 240 g/mol. Determine the molecular formula of the dye.
What is C15H15N3?
The percent composition of strontium nitride.
What is 90.37% Sr, 9.63% N?
The mass percent of water in Mg3P2 x 7H2O.
What is 48.32% water?
The percent ammonium in ammonium iodide.
What is 12.45% NH4?
A compound of iron and oxygen is analyzed and found to contain 69.94% iron and 30.06% oxygen. Find the empirical formula of the compound.
What is Fe2O3?
Nicotine, an alkaloid in the nightshade family of plants that is mainly responsible for the addictive nature of cigarettes, contains 74.02% C, 8.710% H, and 17.27% N. Find the molecular formula if the molar mass of the nicotine compound is 162.28 g/mol.
What is C10H14N2?
The percent composition of aluminum(III) hydroxide.
What is 34.59% Al, 61.53% O, 3.88% H?
The mass percent of water in potassium sulfate heptahydrate.
What is 41.99% water?
The percent sulfite in calcium sulfite pentahydrate.
What is 38.08% SO3?
Norepinephrine, is often released during stressful times and serves to increase our metabolic rate during the “fight or flight” response. The percent composition of this hormone is 56.8% C, 6.56% H, 28.4% O, and 8.28% N. Calculate the empirical formula for this biological compound.
What is C8H11O3N?
The molecular formula of a compound with a percent composition of 49.47% C, 5.201% H, 28.84% N, and 16.48% O, and a molar mass of 194.2 g/mol.
What is C8H10N4O2?
The percent composition of ammonium phosphate.
What is 28.19% N, 8.11% H, 20.78% P, 42.93% O?
The mass percent of water in nickel(IV) sulfate decahydrate.
What is 41.80% water?
The percent arsenate in iron(II) arsenate nonahydrate.
What is 45.73% AsO4?
A sample of a white, granular ionic compound having a mass of 41.764 grams was found in the photography lab. Analysis of this compound revealed that it was composed of 12.144 grams of sodium, 16.948 grams of sulfur, and the rest of the compound was oxygen. Calculate the empirical formula for this compound.
What is Na2S2O3?
A gas was qualitatively analyzed and found to contain only the elements nitrogen and oxygen. The compound was further analyzed and it was determined the gas was composed of 30.43% nitrogen. Given that the molecular mass of the compound is 92.0 g/mole, calculate the molecular formula.
What is N2O4?