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The reaction between calcium metal and chlorine gas is described by the following thermochemical equation: Ca(s) + Cl2(g) = CaCl2(s) ΔH = -796 kJ mol-1 What will be the enthalpy change (to 2 significant figures) for the reaction when 4.0 g of calcium metal reacts with chlorine gas at constant pressure? The relative atomic mass of calcium is 40. ΔH = to 2 significant figures.
Consider 25.0 g of water at 21.7°C that are mixed with 25.0 g of water at 43.3°C in a foam cup calorimeter. The equilibrium temperature reached was 30.4°C. Calculate the calorimeter constant in J/°C.
If the activation energy to prepare a hard boiled egg is 286 KJ, determine how long it would take to prepare a " 3 minute egg " at the top of a mountain where the atmospheric pressure is only 578 torr.
The enthalpy change for melting ice at 0C and constant atmospheric pressure is 6.01 kJ/mol. Calculate the quantity of energy required to melt a moderately large iceberg with a mass of 1.40 million metric tons.
2.0 L of gas A at 1.0 atm and 1.0 L of gas b at 1.0 atm are combined in a 3 L flask. The flask is sealed and over time they react to completely to give gas C according to 2A(g) + B(g)= C(g)
Draw the basic repeating unit of polyethylene terephthalate (PET). Classify PET as a polyamide or polyester. Is PET a condensation or addition polymer? Explain.
Which is predicted to be the most ionic substance?
we are asked to explain the ph and how to find hydrogen ion concentration.find the ph of an acidic substance of your
What is the maximum mass of iron, in grams, that can be obtained from 341 g of iron(III) oxide?
Could you please explain to me the purpose and what's happening when we add the MTBE and then the NaHCO3? I know it has to do something with getting rid of carboxylic acid? and then getting rid of water
Bond Energies, Using the bond energies below, determine the value and sign of delta H for the
for which Kp=2.00 at 20 C. A mixture of NO(g) at a partial pressure of 1.50 atm and NO2(g) at a partial pressure of 0.50 atm is allowed to come to equilibrium in a sealed container maintained at 20 C.
what is the percent yield of a reaction in which 262 g phosphorus trichloride reacts with excess water to form 102 g
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