1) Determine the number of moles of Br2 in a sample consistingof:
8.02×1022 Br2 molecules
2.23×1024 Br atoms
11.0 kg bromine
Determine the mass percent H in the hydrocarbon isopentane,CH3CH(CH3)CH2CH3?
Determine the empirical formula of:
benzo[a]pyrene, a suspected carcinogen found incigarette smoke, consisting of 95.21% C and 4.79% H, by mass
hexachlorophene, used in germicidal soaps, which consists of38.37% C, 1.49% H, 52.28% Cl, and 7.86% O by mass.
The element X forms the compound XOCl2containing 59.6% Cl.
What is element X?
Dimethylhydrazine is a carbon-hydrogen-nitrogen compound used inrocket fuels. When burned in an excess of oxygen, a 0.312 g sampleyields 0.458 gCO2 and 0.374 g H2O.
The nitrogen content of a 0.486 g sample is converted to 0.226 gN2.
The organic solvent thiophene is a carbon–hydrogen–sulfurcompound that yields CO2, H2O, and SO2 on complete combustion. Whensubjected to combustion analysis, a 1.3020−gsample of thiopheneproduces 2.7224 g CO2, 0.5575 g H2O, and 0.9915 g SO2.
What is the empirical formula of thiophene?
