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Question- For NH3, the standard enthalpy of formation is -46 kJ/mol. Calculate the heat of reaction when 1 mole of hydrogen gas reacts with excess nitrogen gas to produce NH3 at 298K and at constant pressure of 1atm
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The value of Ka in water at 25 degrees Celcius for benzoic acid, C6H5COOH (aq), is 6.3 x10-5 M. Calculate the pH and the concentration of the other species in a 0.0200-M aqueous solution of C6H5COOH (aq).
If the symbol X represents a central atom, Y represents outer atoms, and Z represents lone pairs on the central atom, the structure Y--X(with 2 lone pairs)--Y can be abbreviated as XY2Z2
sulfur dioxide was allowed to effuse through a small opening under constant pressure conditions. It required 179 s for 1.00 L of this gas to effuse. Calculate the effusion time of arsine (AsH3) under identical experimental conditions
Why is it an important concept that atoms generally appear in whole number molar ratios to each other in chemical compounds, and in general, would you expect that students would find this ratio to be lower or higher than the actual ratio
A solution is prepared by adding 80.0 mL of 0.090 M HBr to 130.0 mL of 0.50 M HI. Calculate the concentrations of all species in this solution. HBr and HI are both considered strong acids.
Draw a structure containing only carbon and hydrogen that is a chiral alkyne with six carbon atoms. (Wedge/dash bonds are omitted for simplicity.)
1000g of Na2HPO4 is dissolved in 100mL of water. using mass balance and charge balance deterimne the pH of the resulting.
Unlike chemical reactions, for which mass is conserved, nuclear reactions result in slight changes in mass. When mass is lost, it becomes energy according to the equation where is the energy in joules, is the mass defect in kilograms
Derive an expression for (δU/δV)T for a gas that obeys the van der Waals equation of state.
Explain a sample of helium gas occupies 1445mL at 721 mmHg. For a gas sample at constant temperature, find out the volume of helium at 745 mmHg.
At the end of 2009, global population was about 6.8 billion people. Explain what mass of glucose in kg would be required to provide 1900 Cal/person/day of nourishment to the global population for one year
Determine the mass and moles of CO2 evolved in the reaction. What is the mass difference of the gas generator
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