Based on the following thermochemical equation, which statement is false? NH3(l) NH3(g) Δ H° = +23.4 kJ

What is the maximum possible quantity of product obtained from a chemical reaction called?

A 125.0-mL contains a gas at 27°C and 760 mm Hg of pressure. The gas is pumped into an empty 1.50-L flask also at a temperature of 27°C. What is the pressure (in atm) of the gas in the new flask?

The complete reaction of 16.12 g of titanium with 23.88 g of chlorine (Cl2) produces a compound with the formula TixCly. What is the empirical formula of the compound?

Which concept is not associated with the kinetic-molecular theory of gases?

Convert 699 torr to 1) atm, 2) mmHg and 3) kPa.

A sample of 1.50 moles of ethanol (C2H5OH) is initially at 25.0°C. If the sample absorbs 3.00 kJ of heat, what is the final temperature of the ethanol? (specific heat of ethanol = 2.46 J g−1 °C−1)

The standard enthalpies of formation for several substances are given below: CO(g) −110.5 kJ/mol CO2(g) −393.5 kJ/mol H2O(l) −285.8 kJ/mol H2O(g) −241.8 kJ/mol H2O2(l) −187.8 kJ/mol CH3OH(g) −200.7 kJ/mol C2H5OH(l) −277.7 kJ/mol C2H5OH(g) −235.1 kJ/mol Determine the ΔH° for the reaction below. 2CO(g) + 4H2(g) → C2H5OH(g) + H2O(g)

How many kilojoules are there in 150 Calories of popcorn?

What is the oxidation number of O in Fe2O3?

A mixture of H2(g) and Cl2(g) exerts a total pressure of 2.50 atm. If the mole fraction of H2 is 0.490, what is the partial pressure (in atm) of H2?

In the reaction given below, how many grams of water are consumed if 4.0 g of hydrogen gas and 32.0 g of oxygen gas are produced? 2 H2O → 2 H2 + O2

Which of the following represents oxidation?

A hydrochloric acid (HCl) solution (25.00 m)L sample is neutralized by adding 31.22 mL of 0.08152 M Ca(OH)2. What is the molarity of the HCl solution?

A 64.05 mL sample of 0.250 M CH3COOH is to be exactly neutralized with 0.500 M KOH. How many milliliters of KOH will be required?

A 25.00 mL sample of H3PO4 solution is neutralized by exactly 54.93 mL of 0.04345 M Ca(OH)2. What is the molarity of the H3PO4 solution?

In an endothermic reaction, heat is transferred from the _____________ to the _____________.

How many grams of CO2 are produced from the reaction of 5.00 g of C2H6 with 25.0 g of O2? 2 C2H6 + 7 O2 → 4 CO2 + 6 H2O

How are the pressure and the absolute temperature of a gas related for a given number of moles at constant volume?

A student mixes 10 g of an aqueous HCl solution with 10 g of an aqueous NaOH solution in a coffee-cup calorimeter and determines that the temperature change of the mixture upon heating was 3.0 C. If the student calculated the heat using the equation: q = (20g)(4.184 J g-1 K-1)(3.0 K) What assumptions are required for the value of the heat to be accurate? I. the solution has the same specific heat as water II the calorimeter absorbed little or no heat III the initial temperature was 25 C

What ions are present in an aqueous solution of lithium perchlorate, LiClO4(aq)?

Which of the methods described below will yield 500 mL of a 0.100 M KMnO4 solution?

For the reaction given below, how many moles of aluminum will react if 12 moles of Br2 react and 8 moles of AlBr3 are produced? 2 Al + 3 Br2 → 2 AlBr3

Ammonia and sulfuric acid react according to the equation given below. How many milliliters of 0.110 M sulfuric acid are required to exactly neutralize 25.0 mL of 0.0840 M NH3 solution? 2 NH3(aq) + H2SO4(aq) → (NH4)2SO4(aq)

A cup of rice contain 110 Calories (dietary calories)? What is this energy in kJ (1 cal = 4.184 J)

A reaction has a theoretical yield of 38.73 g. It produces 18.81 g of product. Calculate the percent yield.

The Roman numerals in the reaction given represent the coefficients in the balanced chemical equation. What are the values of the coefficients? I Fe3O4 + II H2 → III Fe + IV H2O

Write a balanced chemical equation for the exchange reaction that occurs when KOH(aq) is added to FeCl3(aq).

Determine the heat of reaction for the process C2H4(g) + 6HCl(g) → 2CHCl3(g) + 4H2(g) using the information given below: 2C(s) + 2H2(g) → C2H4(g) ΔH° = 52.3 kJ H2(g) + Cl2(g) → 2HCl(g) Δ H° = −184.6kJ C(s) + 1/2H2(g) + 3/2Cl2(g) → CHCl3(g) ΔH° = −103.1 kJ

Calculate the number of moles of a gas that occupy 225 mL at STP. The value of R = 0.0821 L atm mol−1 K−1.

If a 45.0 mL sample of 2.20 M Na2SO4 is diluted to yield a final solution that is 0.110 M in sodium ions, what is the volume of the final solution?

How many moles of ions are in 285 mL of 0.0150 M MgCl2?

What is the volume in mililiters of 2.361 g of nitrogen dioxide that occupies at 25.1°C and 3.1 atm of pressure? R = 0.0821 L atm mol−1 K−1.

Arrange the following gaseous substances in order of decreasing average molecular speed at 25°C. argon, fluorine, carbon dioxide, oxygen, helium

A solution is made by dissolving 60.0 g of AlCl3 in enough water to make 250.0 mL of solution. How many moles of chloride ions are in 5.00 mL of solution?

Determine the heat of reaction for the process 2 Fe(s) + 3/2 O2(g) → Fe2O3(s) using the information given below: 2 Fe(s) + 6 H2O(l) → 2 Fe(OH)3(s) + 3 H2(g) Δ H° = +321.8 kJ H2(g) + 1/2 O2(g) → H2O(l) Δ H° = −285.8 kJ Fe2O3(s) + 3 H2O(l) → 2 Fe(OH)3(s) ΔH° = +288.6 kJ

In the reaction below, 8.0 g of H2 react with 7.0 g of O2. Which of the following statements is incorrect? 2 H2 + O2 → 2 H2O