Rachel M

Most popular questions and responses by Rachel M
  1. AP Chemistry

    DrBob222 PLEASE HELP Hf of CO2 = -393.5 kJ/mol Hf of H2O = -285.8 kJ/mol The combustion reaction for benzoic acid C6H5CO2H(s) + 15/2 O2(g) → 7 CO2(g) + 3 H2O(ℓ) has ∆H0 = −3226.7 kJ/mole. Use Hess’s Law to calculate ∆H0f for benzoic acid. 1.

    asked on September 27, 2016
  2. AP Chemistry

    Given that the specific heat capacities of ice and steam are 2.06 J/g ·◦C and 2.03 J/g·◦C,respectively, calculate the total quantity of heat necessary to melt 19.2 g of ice at −50.0 ◦C and heat it to steam at 200◦C. The molar heats of fusion

    asked on September 27, 2016
  3. AP Chemistry

    Given that the specific heat capacities of ice and steam are 2.06 J/g · ◦C and 2.03 J/g·◦C, respectively, calculate the total quantity of heat necessary to melt 19.2 g of ice at −50.0◦C and heat it to steam at 200◦C. The molar heats of fusion

    asked on September 27, 2016
  4. Chemistry

    (DrBob222 please help me) What would be the final temperature of the system if 16.6 g of lead at 138 ◦C is dropped into 23.4 g of water at 8.68 ◦C in an insulated container? The specific heat of lead is 0.128 J/g◦C. Please explain with the numbers

    asked on September 22, 2016
  5. physics

    A stone is catapulted at time t = 0, with an initial velocity of magnitude 20.2 m/s and at an angle of 39.1° above the horizontal. What are the magnitudes of the (a) horizontal and (b) vertical components of its displacement from the catapult site at t =

    asked on February 8, 2012
  1. AP Chemistry

    385.2

    posted on September 27, 2016