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An endothermic chemical reaction with ?E = +41 kJ/mol has an activation energy of +95 kJ/mol. What is the activation energy for the reverse reaction?
To find the % by mass of a compound in a given sample - Determine the percent by mass of calcium carbonate in the sample. State any assumptions.
How much H2O is produced when 20000 g of C2H2 burns completely? Answer in units of grams
calculate the new temperature in Celcius- tank of helium gas with a pressure of 270 torr at 4 degrees celcius is heated to give a pressure of 1500 torr
when a mixture of these two gases are compressed to a smaller volume, which way does the reaction shift to? the reaction is originally at 588 kelvins and has an equilibrium constant of "k"=0.0180
Important information about Chem problem, A 25 mL sample of .13M HCl is mixed with 15mL of .24M NaOH. The pH of the resulting solution will be nearest. The answer is 11.9
Calculating Volume Needed for Level of pH, A 1.00g sample of benzoic acid (C6H5CO2H, FW = 122.12g/mol,Ka = 6.5 x 10^ -5) is dissolved in water to give a solution with a volume of 500mL.
1.52g of an oxide of nitrogen contains 0.56 g of oxygen. determine the empirical formula of the compound.?
Describe two different ways by which electrons can move from the valence band to the conduction band.
Consider the combustion reaction: CH4 (g) + 2O2 (g) = CO2 (g) + 2H2O (l) Is this an exothermic reaction? If 100g of natural gas (CH4) is burned, calculate the heat exchange (balance the equation)
How many silver atoms can be produced if 0.00350g of Cu are reacted with excess AgNO3, according to the equation :Cu + 2AgNO3 yields 2Ag + Cu(NO3)2
A 122 piece of metal is heated to 285 and dropped into 84.0 of water at 26. If the final temperature of the water and metal is 58.3, what is the specific heat of the metal.
what is the enthapy change needed to heat 1 kg of water at 0.4 MPa and 4°C to steam at 150°C and 0.4 MPa? b/ Does a state change from saturated vapor at 230°C to the state 100°C and 0.05 MPa represent an enthalpy increase or decrease?
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