When 1.42 g of iron reacts with 1.80 g of chlorine, 3.22 g of iron(II) chloride (FeCl2, molar mass = 126.75 g/mol) and 6.8 kJ of heat is produced. What is the enthalpy change for the reaction when 1 mole of iron(II) chloride is produced? round to sig figs

If 0.0181 moles reacted, and 372.8 J of heat were absorbed by the reaction in a coffee cup calorimeter, what is the enthalpy of the reaction in kJ/mol?

4. You wish to determine the amount of heat produced by the reaction of propane with oxygen. You are given some known reactions: I. II. III. 3 C(s) (g) + 4H₂(g) → C₂H₂ (g) C(s) (g) + O₂(g) → CO₂ (g) H₂(g) + O₂(g) → H₂O (1) ΔΗ, ΔΗ, ΔΗ, (a) Combine reactions 1, 2 and 3 to form a series of steps that sum to the combustion of propane: C₂H₂(g) +50₂ (g) →3CO₂ (g) + 4H₂O (1) (b) Given the following values for the enthalpy changes, combustion of propane. AH₂=-393.5 kJ/mol AH, =-103.85 kJ/mol calculate AH for the AH, = -285.8kJ/mol

A 77.5g piece of brass is heated so that its temperature is 98.7◦C. Next,it is quickly placed in a calorimeter containing 102.76 g of water at 18.5◦C.Knowing that the final temperature is 23.5◦C, what is the specific heat of this alloy?Note: Brass is an alloy of copper and zinc. From 98.7 to 23.5◦C, this alloy does not changeno phase, it remains in solid form.

A chemist carefully measures the amount of heat needed to raise the temperature of a 1.52 kg sample of C,H,F, from -0.9 °C to 13.0 °C. The experiment 9. 4'2 4 shows that 2.83 × 10" J of heat are needed. What can the chemist report for the molar heat capacity of C,H¸F,? Round your answer to 3 significant digits. - 1 - 1 •K J. mol alo Ar

A 30.0 g sample of chromium is heated to 100.0 °C in a boiling water bath. The sample is added to a calorimeter charged with 45.0 mL of water at 34.1 °C. The final temperature of the calorimeter contents is 38.5 °C. Calculate the specific heat of chromium.

What is the enthalpy change when  2.00 mol of oxygen (O2) react? C12H22O11(s)   + 12 O2(g) →    12 CO2(g)  +    11 H2O(l)        ΔH = -5644 kJ

An ideal gas in a cylinder fitted with a piston expands at constant temperature from a pressure of 9 atm and a volume of 4.,0 L to a final volume of 13 L against a constant opposing pressure of 1.4 atm. How much heat does the gas absorb, expressed in units of L atm (liter x atm)? Latm

Charcoal is primarily carbon. What mass of CO2 is produced if you burn enough carbon (in the form of charcoal) to produce 4.80 x 10² kJ of heat? The balanced chemical equation is as follows: C(s) + O2 (g) → CO2 (g), Express the mass in grams to three significant figures. VE ΑΣΦ m = ? g AHxn=-393.5 kJ

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