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chicken egg mas the mass of 60kg.The egg is 10% of the total mass.The egg shall is made of calcium carbonate what is the mass of the calcium in the egg
The combustion of 0.1566 g benzoic acid increases the temperature of a bomb calorimeter by 2.51°C. Calculate the heat capacity of this calorimeter. (The energy released by combustion of benzoic acid is 26.42 kJ/g.)
Heat capacity = __________kJ/°C
A 0.2182-g sample of vanillin (C8H8O3) is then burned in the same calorimeter, and the temperature increases by 3.29°C. What is the energy of combustion per gram of vanillin?
Energy = _________kJ/g
Per mole of vanillin?
Energy = _________kJ/mol
1) A 149.3-g sample of a metal at 75.9°C is added to 149.3 g H2O at 14.9°C. The temperature of the water rises to 18.4°C. Calculate the specific heat capacity of the metal, assuming that all the heat lost by the metal is gained by the water. The specific heat capacity of water is 4.18 J/°C·g.
Specific heat capacity = ________J/°C·g
2) In a coffee-cup calorimeter, 110.0 mL of 1.4 M NaOH and 110.0 mL of 1.4 M HCl are mixed. Both solutions were originally at 21.7°C. After the reaction, the final temperature is 31.1°C. Assuming that all the solutions have a density of 1.0 g/cm^3 and a specific heat capacity of 4.18 J/°C·g, calculate the enthalpy change for the neutralization of HCl by NaOH. Assume that no heat is lost to the surroundings or to the calorimeter.
ΔH = _________kJ/mol
Chlorine gas (Cl2) occupies a volume of 25.0 mL at 310K. Calculate the volume it will occupy when heated to 590 K.
How we can differenciate the statement whether it is law, theory or hypothesis
Determine the enthalpy for the reaction CaCO3 - CaO + CO2
Given data:
2Ca + 2C + 3O2 - 2CaCO3 enthalpy= -2,414 kJ/mol
C+ O2 - CO2 enthalpy= -393.5 kJ/mol
Ca + ½O2 - CaO enthalpy= -1,270 kJ/mol
If the enthalpy for 2C2H6 (g) + 7O2 (g) - 4CO2 + 6H2O is -2,650 kJ/mol. What is the enthalpy for this reaction?
6C2H6 (g) + 21O2 (g) - 12CO2 (g) + 18H2O ?
One method for the destruction of ozone in the upper athmosphere is:
O3+NO=NO2+O2 (slow)
NO2+O=NO+ O2 (fast)
Overall rxn: O3 +O= 2O2
A. Which species is an intermediate?
B. Which species is a catalyst?
C. Which is the rate determining step?
D. Write the rate law for the reaction
The rusting of iron is a spontaneous and it's accompanied by a decrease in the entropy of the system(the iron and officer. What can we conclude about the entropy change of surrounding
A 0.205 g sample of CaCO3 (Mr = 100.1 g/mol) is added to a flask along with 7.50 mL of 2.00 M HCl.
CaCO3(aq) + 2HCl(aq) → CaCl2(aq) + H2O(l) + CO2(g)
Enough water is then added to make a 125.0 mL solution. A 10.00 mL aliquot of this solution is taken and titrated with 0.058 M NaOH.
NaOH(aq) + HCl(aq) → H2O(l) + NaCl(aq)
How many mL of NaOH are used?
