# chemistry

A 4.98 g sample of aniline (C6H5NH2, molar mass = 93.13 g/mol) was combusted in a bomb calorimeter with a heat capacity of 4.25 kJ/°C. If the temperature rose from 29.5°C to 69.8°C, determine the value of ΔH°comb for aniline.

1. 👍 0
2. 👎 0
3. 👁 1,498
1. delta H = qcal*delta T for a 4.98g sample.
(delta H/4.98) = delta H in kJ/g. Multiply by molar mass to convert to kJ/mol.

1. 👍 0
2. 👎 0
2. -7.81 × 103 kJ/mol

1. 👍 1
2. 👎 1

1. 👍 1
2. 👎 0
4. 7.84 * 10^3

1. 👍 0
2. 👎 1
5. katie youre dumb. its -3.2*10^3

1. 👍 1
2. 👎 0
6. HAHAHAHAHAHAHAHA!!!!!!11!1!!one1! that's hilarious... but the answer is -3.2*10^3

1. 👍 1
2. 👎 0
7. None of these responses help

1. 👍 0
2. 👎 0
8. Adam is very toxic and doesnt know what a derivative is. Yikes. Also doesnt go to uconn, #notevenahusky

1. 👍 1
2. 👎 1
9. i just wanna give a shoutout to my boy nenortboi for holdin the city down when the liberals attacked. It's been a great honour sir *salutes*. Poor one out for all the fallen conservagangs who sacrificed their lives for our country. You will be missed

1. 👍 0
2. 👎 0

## Similar Questions

1. ### college chem

A 1.10g- sample contains only glucose and sucrose . When the sample is dissolved in water to a total solution volume of 25.0ML , the osmotic pressure of the solution is 3.78atm at 298K a.What is the percent by mass of glucose in

asked by mm on January 25, 2010
2. ### Chem

A beaker containing 25.0 mL of 0.360 M H2SO4 spills on the counter. How much baking soda, NaHCO3, will be needed to neutralize the acid? H2SO4 (aq) + 2 NaHCO3 (s) -> Na2SO4 (aq) + 2 H2CO3 (l) GIVEN: - I've converted 25.0 mL to

asked by Joyce on May 11, 2016
3. ### Chemistry

How do I do this?? Calculate the pH at the equivalence point for the titration of 0.20 M aniline (C6H5NH2, Kb = 3.8 x 10-10) with 0.20 M HCl. [Hint: remember the dilution factor caused by addition of titrant to the aniline

asked by Jamie on October 15, 2009
4. ### Chemistry 11

A hydrate of zinc chlorate, Zn(ClO3)2 .xH2O(s) contains 21.5% zinc by mass. Find the value of x. What I've done: Molar mass of Zn: 65.409 g/mol Molar mass of Cl: 2*35.453 =70.906 g/mol Molar mass of O: 6*15.9994 =95.9964 g/mol

asked by Anonymous on November 13, 2014
1. ### Chemistry

A solution of aniline(C6H5NH2, Kb=4.2x10^-10) has a pH of 8.69 at 25 Celsius. What was the initial concentration of aniline? I have so far don't know if it's right: *. [H3O]=10^-8.69=2x10^-9 * 4.2x10^-10=(2x10^-9)^2 / x

asked by V on March 20, 2013
2. ### chemistry

the molar mass of an unknown gas was measured by an effusion experiment. it took 63s for te gas to effuse. where as nitrogen gas took 48sec. what is the molar mass of the gas? 32g/mol 37g/mol 24g/mol 16g/mol 48g/mol

asked by Ellie on June 21, 2010
3. ### Chemistry

The molar enthalpy of combustion of glucose is -2803 kJ. A mass of 1.000 g glucose is combusted in a bomb calorimeter. If the calorimeter contains 875 g H2O and the bomb has a heat capacity of 457 J/C, what is the temperature

asked by Kyle on October 11, 2012
4. ### Chemistry

Given the following equation : 2Al+6HCl 2AlCl 3 +3H 2 If 3.00 grams of H 2 were produced, how many grams of Al reacted ? (Molar mass of Al = 26.98g / (mol) , molar mass of H 2 = 2.016 g/mol)

asked by Erika on February 20, 2020
1. ### Chem 11

So I did a lab determining the chemical formula of a hydrate. I really just need somebody to check this over for me. We had to find the molecular formula of a hydrate of copper (2) sulphate, CuSO4 .xH2O. My observation table looks

asked by Katherine on November 18, 2014
2. ### Chemistry

A sample weighing 3.064 g is a mixture of Fe2O3 (molar mass = 159.69) and Al2O3 (molar mass = 101.96). When heat and a stream of H2 gas is applied to the sample, the Fe2O3 reacts to form metallic Fe and H2O(g). The Al2O3 does not

asked by Chris on October 29, 2012
3. ### science

Written out, would the reaction between anihiline [C6H5NH2] and perchloric acid look like this: C6H5NH2 + HClO4 -> C6H5ClO4 + HNH2 ? The NH2 group on aniline is basic. It takes on a H^+ from HClO4 and forms the salt. The salt is

asked by Crystal on October 19, 2006