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A tank is first evacuated, and then connected to a 75.0 L cylinder of compressed nitrogen gas. The gas pressure in the cylinder, originally at 15.8 atm, falls to 1.05 atm without a change in temperature. What is the volume of the tank?
A 2.914-g sample of gypsum, a hydrated salt of calcium sulfate, CaSO4, is heated at a temperature greater than 170 Celsius in a crucible until a constant mass is reached.
The combustion of ethane produces carbon dioxide and steam: 2C2H6 + 7O2 --- 4CO2 +6H20 How many moles of CO2 are produces when 5.55 mol of ethane are burned in an excess of oxygen.
what is the number of valence electrons for nh4+ and what is the lewis structure for that molecule. and how many remaining electrons are there and how do you find the formal charge.
Calculate Keq for 2 moles of electron(s) in each half-reaction and a standard potential of 0.12 V. Calculate Keq for 2 moles of electron(s) in each half-reaction and a standard potential of (-0.54) V.
Radioactive radon gas (222Rn) enters an average building at a rate of 5 picocuries per second per square meter of foundation area. Consider a house with a foundation of 400 square meters and a volume of 1000 cubic meters.
The specific heat of silver is 0.235 J/g·K. Its melting point is 962°C, and its heat of fusion is 11.3 kJ/mol. What quantity of heat, in joules, is required to change 7.50 g of silver from solid at 25°C to liquid at 962°C?
What is the pH of 10 drops of triethylamine in a dropperful of demineralized water? How does the reaction between triethylamine and water explain the measurement of the pH?
Arsine (AsH3) has a vapor pressure is 35 Torr at -111.95?C and 253 Torr at -83.6 ?C. What is the normal boiling point of arsine.
Determine that how many moles of molecular hydrogen are used per mole of the precatalyst in order to convert it entirely to platinum metal?
What fraction of the spherical atomic volume is occupied by the nucleus? What fraction of this atom's mass is contributed by its nucleus?
The partial pressure of CO2 inside a bottle of soft drink is 4.0 atm at 25°C. The solubility of CO2 is 0.12 mol/L. When the bottle is opened, the partial pressure drops to 3.0 * 10-4 atm. What is the solubility of CO2 in the open drink? Express yo..
A piece of metal with a mass of 146 g is placed in a 50 mL graduated cylinder. The water level rises from 20. mL to 35 mL. What is the density of the metal?
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