02/11/22

Naphthalene combustion can be used to calibrate the heat capacity of a bomb calorimeter. The heat of combustion of naphthalene is ±40.1 kJ/g. (continued in description)
When 3.450 g of naphthalene was burned in a calorimetercontaining 1.000 kg of water, a temperature rise of 4.345°C was observed. What is the heatcapacity of the bomb calorimeter (excluding the water)? more
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02/11/22

A glass containing 234.5 g of H2O at exactly 20°C was placed in a freezer. The water loses 34.5 kJ as it cools to a constant temperature. What is its new temperature?
(The specific heat of water is 4.184 J/g·°C.)
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02/11/22

A beaker contains 345.0 g of ethanol at 18.2°C. If the ethanol absorbs 1125 J of heat without losing heat to the surroundings, what will be the final temperature of the ethanol?
(The specific heat of ethanol is 2.46 J/g·°C.)
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02/11/22

Limestone stalactites and stalagmites are formed in caves by the following reaction: Ca2+ (aq) + 2HCO3 - CaCO3 (s) + CO2 (g) + H2O (g) (continued in description)

If one mole of calcium carbonate forms at 298K under one atmosphere pressure, the reaction performs3.45 kJ of PV work, pushing back at the atmosphere as the gaseous carbon dioxide forms. At thesame... more
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02/10/22

need help with this question
need help with this chemistry question below how many grams of Agcl will be formed when 60 ml of .500m M agN03is completely reacted to the balanced chemical reaction... more
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02/10/22

Please help...I am new here. Sodium chlorate decomposes into sodium chloride and oxygen gas as seen in the equation below.

­­2NaClO3­ -->  2NaCl +3O2 How many moles of NaCl were produced by 5 moles of  NaClO3­? Round your answer to the nearest whole number.
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02/10/22

Hess's Law Paper
Consider the formation of ethane. a. provided the following data, calculate ΔH for the reaction:2 C (s) + 3 H2 (g) ---> C2H6 (g)4 C2H6 (g) + 14 O2 (g) --> 8 CO2 (g) + 12 H2O (l) ΔH = -6240... more
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02/10/22

Hess's Law Paper
Calculate the enthalpy change in the reaction below with the provided data4 NH3 (g) + 5 O2 (g) ---> 4 NO (g) + 6 H2O (l)ΔHf° NH3 (g) = -45.5 kJ mol-1ΔHf° H2O (l) = -286 kJ mol-1ΔHf° NO (g) = 91... more
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02/10/22

Thermochemistry summary
Use the table of bond enthalpies below to calculate ΔH for the following reactions.BOND ENTHALPY(kJ mol-1)H - H 436Cl - Cl 242H - Cl 431C = C 612C - C 348C - H 412Br... more
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02/10/22

Thermochemistry Summary
Assuming the specific heat of the water to be 4.200 J g^-1 K^-1, calculate the change in temperature of 2.000 kg of water (assuming that only 63.15% of the energy is transferred to the water) that... more
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02/10/22

Thermochemistry Summary
Butane (C4H10) has a standard of combustion of -2881 kJ mol^-1.a. What is the significance of the negative sign associated with the enthalpy change?b. calculate the change in enthalpy when 4.00... more
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02/10/22

A chemist prepares a solution of copper(II) sulfate by measuring out 45.0 μmol of copper(II) sulfate into a .450 ml volumetric flask and filling the flask to the mark with water.
Calculate the concentration in μmol / L of the chemist's copper(II) sulfate solution. Round your answer to 3 significant digits.= ____ μmol / L
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02/10/22

What is the pressure (in atm) of a gas trapped in a balloon along with water vapor at 30C if the atmospheric pressure is 1.005 atm?(Hint: Review the Dalton’s Law of partial pressures).
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02/10/22

I need help in Chemistry...
What is the step-by-step procedure and solution on solving these?1.) 7.50 g of sodium chloride are added to 3200 mL of water. Find the mole fraction of the sodium chloride and of the water in the... more
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02/10/22

A water heater contains 59 gallons of water how many kilowatt hours of energy are necessary to heat the water in the water heater by 25°C
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02/10/22

The energy required to promote an electron in the H-atom from the third excited state to the 9th excited state as a function of K is a) -.053 KJ b) .099 KJ c) None.

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02/09/22

What is the volume in (L) of hydrogen gas obtained if 0.15 g H2 are produced in the reaction of magnesium and HCl? Assume the temperature is 25’C and the pressure of the H2 gas is 0.972 atm.
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02/09/22

You use a tire gauge to measure the air pressure in a bicycle tire. The gauge reads 38.5 psi. What is the absolute pressure in the tire in kilopascals?

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02/09/22

A sample of methane gas is at 1.50 atm and 305 K. The sample is put in a freezer and cooled to 255 K at constant volume. What is the new pressure?
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02/09/22

Liquid octane (CH3(CH2)6 (CH3) reacts with gaseous oxygen gas (O2) to produce gaseous carbon dioxide (CO2) and gaseous water (H2O).
If 8.68g of water is produced from the reaction of 29.7g of octane and 43.7g of oxygen gas, calculate the percent yield of water. Round your answer to 3 significant figures.= ____ %
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02/08/22

What is the molality of a solution containing 13.9 g Na2SO4 dissolved in 1796.0 g of water?
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02/08/22

Explain what a limiting reactant is and describe the process to determine the limiting reactant in the example below:
Given 3.4 grams of x element with a molar mass of 24 g/mol and 4.2 grams of y element with a molar mass of 35 g/mol. How much of compound xy2 can be generated?   x + 2y -> xy2?
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02/08/22

A student determines the mass of a 100 mL beaker filled with 50 mL of water to be 154.34 grams. After a tablet reacts with the water, the mass including the dissolved tablet is 157.26 grams.
A student determines the mass of a 100 mL beaker filled with 50 mL of water to be 154.34 grams. After a tablet reacts with the water, the mass including the dissolved tablet is 157.26 grams.
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02/08/22

Chemistry equilibrium

20.00 mL of a 0.25 M solution of BaCl2(aq) was added to an equal volume of 0.35 M solution of Na2SO4 (aq). Show a precipitate forms then calculate the concentration of free Ba^ 2+ (aq) when the... more
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02/08/22

A 1.084 g sample contains only vitamin C (C6H8O6) and sucralose (C12H19Cl3O8).

When the sample is dissolved in water to a total volume of 37.4 mL, the osmotic pressure of the solution is 3.41 atm at 293 K. What is the mass percent of vitamin C and sucralose in the sample?
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