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Find the heat of combustion in kJ/g for each gas. These values are valid at 25°C, where the water produced by the reaction is in the liquid state.
An Alka-Seltzer tablet contains 1.916 grams of sodium bicarbonate. Using the formula: H3C6H5O7+ 3NaHCO3-> NaC6H5O7+ 3H2O+ 3CO2. How many moles of carbon dioxide gas is produced based on the mass
Present brief descriptions of three methods that can be utilized to decrease noise from POST DATA acquisition by an instrument. Also present descriptions of two methods that can be used to reduce n
A stell cylinder has a length of 2.16in, a radius of 0.22in, and a mass of 41g. What is the density of the steel in g/cm cubed.
Calculate the mass of material required if 1500 calories of energy causes a change from -27 degrees fahrenheit to 91 degrees celcius and the specific heat capacity is 0.25 joules/gram-degree C.
If a 210 mg piece of gold (density =19.32 {rm g}/{rm cm}^{3}) is hammered into a sheet measuring 2.5times1.0 {rm ft}, what is the average thickness of the sheet in meters?
If a 1.22 g piece of gold is hammered into a sheet whose area is 32.4 ft2, what is the average thickness of the sheet? (The density of gold is 19.32 g cm-3.)
A spheroidal bacterium with a diameter of 1micromolemole contains four molecules of a particular protein. What is the molar concentration of the protein.
Oxygen is released until the volume is 10.0 L. How many moles of O2 are removed and What is the volume after 4.00g of He is added to the 4.80g of O2 gas in the container?
Calculate the maximum mass in grams of H2S that can form when 155 g aluminum sulfide reacts with excess water according to:
The heat of fusion of ice (the heat associated with ice melting) is 6.0. Find the temperature of the coffee after the ice melts.
The standard free energy of activation of a reaction A is 86.2 kJ mol-1 (20.6 kcal mol-1) at 298 K. Reaction B is one million times faster than reaction A at the same temperature. The products of e
How many grams of water can be cooled from 30 degrees C to 18 degrees C by the evaporation of 49g of water? (The heat of vaporization of water in this temperature range is 2.4kJ/g . The specific he
When 325 g Bi2O3 reacts with excess carbon, how many moles of Bi are expected to form?
Heat transfer to the air during isothermal expansion is 40kj, 7.0 bars and 0.24m3. Determine max & min temp cycle. Volume at the end also work and heat transfer for each four process?
Which of the following substances will be soluble in the non-polar solvent carbon tetrachloride (CCl4)? (Select all that apply.)
Assuming the solution has a heat capacity of 4.18 J/°C · g and assuming no heat loss to the calorimeter, calculate the enthalpy change for the dissolution of NH4NO3 in units of kJ/mol.
An aqueous CaCl2 solution has a vapor pressure of 81.1 mmHg at 50 C. The vapor pressure of pure water at this temperature is 92.6 mmHg. What is the concentration of CaCl2 in mass percent?
Water in an open beaker evaporates over time. As the water is evaporating,is the vapor pressure increasing, decreasing, or staying the same?
What is the change in pH after addition of 10.0 mL of 1.0 sodium hydroxide to 90.0 mL of a 1.0 M NH3/1.0 M NH4+ buffer? [ Kb for ammonia is 1.8 x 10^-5]? 0.1 pH unit, 0.001 pH unit 0.01 pH unit 1.0
If the titration required 23.95 mL of 0.2556 M HCL to reach the endpoint, calculate the equilibrium molar concentration of B4O5(OH)(4 in the saturated solution.
Calculate the mass of urea that should be dissolved in 187 g of water at 35C to produce a solution with vapor pressure of 37.7 mmHg (At 35C, P(water)=42.2 mmHg)
A reaction mixture initially contains 2.8M H2O and 2.6 M SO2. Determine the equilibrium concentration of H2S if Kc for the reaction at this temperature is 1.3 x 10^-6
In aqueous solution, acetic acid as represented above. In 0.0105M HC2H3O2 (aq) at 25C, the hydronium ion concentration is 4.35 *10 -4 M. Determine the pH of the solution halfway to the equivalence po
Carbon disulfide, CS2, is a volatile, flammable liquid. It has a vapor pressure of 400.0 mmHg at 28.0°C and 760.0 mmHg at 46.5°C. What is the heat of vaporization of this substance?