Using the information below, calculate ΔH of NH3(g)+HCl(g)⟶NH4Cl(s). 12 N2(g) + 32 H2(g) ⟶ NH3(g)ΔH = −46.19 kJ/mol 12 H2(g) + 12 Cl2(g) ⟶ HCl(g) ΔH = −92.30 kJ/mol 12 N2(g) + 2 H2(g) + 12 Cl2(g)⟶NH4Cl(s)ΔH = −314.4 kJ/mol Your answer should have four significant figures. Provide your answer below: kJ/mol
What is the standard enthalpy of formation (at 1 atm and 25∘C ) for O2(g) ? Select the correct answer below: 0 kJ/mol 25 kJ/mol 100 kJ/mol −50 kJ/mol
A gas expands from a volume of 4.65 L to 6.21 L under a constant external pressure of 2.33 atm. How much work is done on the gas in joules? Give the value to three significant figures. Provide your answer below:
Calculate the mass in grams of 2.000 moles of sulfuric acid. Show all calculations and report to the correct number of sig figs.
How many moles are in 35.7 g of anhydrous copper(II) sulfate? Show all calculations and report to the correct number of sig figs.
How many molecules are contained in 0.0231 moles of carbon dioxide? Show all calculations and report to the correct number of sig figs.
You have 0.330 mole of each of the following elements: Be, B, Br, Ba, and Bi. Which sample has the largest mass? Show all calculations and report to the correct number of sig figs.
A 3.6 g sample of lithium contains atoms. Show all calculations and report to the correct number of sig figs.
How many molecules are contained in 50.0 g of carbon dioxide? Show all calculations and report to the correct number of sig figs.
A hydrocarbon is 92.3% carbon and 7.7% hydrogen by mass, and its molar mass is 26 g/mol. What is its molecular formula? Show all calculations and report to the correct number of sig figs.
Write a balanced chemical equation for the following (include s, l, g, aq and use an = for an arrow): Explosive decomposition of dynamite: liquid nitroglycerine (C3H5N3O9) explodes to produce a mixture of gases - carbon dioxide, water vapor, nitrogen, and oxygen.
An average sample of coal contains 3.0% sulfur by mass. Calculate the moles of sulfur present in 2.40×103 kg of coal. Show all calculations and report to the correct number of sig figs.
The density of liquid benzene, C6H6, is 0.879 g/cm3 at 15∘C. How many moles are there in 73.0 mL of benzene at 15∘C ? Show all calculations and report to the correct number of sig figs.
What theoretical quantity in grams of Ag2S can be obtained from the reaction of 10.5 g of Ag with 7.5 g of S in the following reaction? Show all calculations and report to the correct number of sig figs. 2Ag + S → Ag2S
When 5.11g of a hydrocarbon is burned in a bomb calorimeter, the temperature increases by 2.75∘C. If the heat capacity of the calorimeter is 52.3 J/∘C and it is submerged in 601 mL of water, how much heat (in kJ ) was produced by the hydrocarbon combustion? Express your answer with correct number of significant figures.
A 1.5 kg block of Ni at 100∘C is placed into 500 mL of water that has a temperature of 21∘C. What is the final temperature assuming the specific heat of Ni is 0.44 J/g−∘C and the specific heat of water is 4.184 J/g−∘C. Please answer with "degrees C" Hint: the total heat lost is equal to the total heat gained! 50 degrees C 30 degrees C 60 degrees C 40 degrees C