9

Chemistry

1 answer:

marishachu [46]3 years ago

8 0

Answer:

B. as a food preservative in the manufacture of detergents

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A 2.49 g sample of aniline (C6H5NH2, molar mass = 93.13 g/mol) was combusted in a bomb calorimeter with a heat capacity of 4.25

Maslowich

The value of delta H° for aniline = 6415 Kj/mol

<u><em>calculation</em></u>

Step 1: find heat

Q (heat) = C (specific heat capacity) x ΔT (change in temperature)

C= 4.25 kj/c°

ΔT = 69.8-29.5 = 40.3 c°

Q= 4.25 kj/c x 40.3 c = 171.28 kj

Step 2: find the moles of aniline

moles = mass/molar mass

= 2.49 g/ 93.13 g/mol =0.0267 moles

Step 3: find delta H

171.28 kj/0.0267 mol = 6415 kj/mol

since the reaction is exothermic delta H = 6415 Kj/mol

4 0

2 years ago

At sea level water usually boils at 100. °C and 760. mmHg pressure. On Mt Whitney, the pressure is about 560. mmHg. At what temp

WITCHER [35]

Answer:

91.7°C

Explanation:

We suppose you have a formula to work from. However, that is not supplied with this problem statement, so we looked one up.

The formula in the attachment is supposed to have good accuracy in the temperature range of interest. It gives vapor pressure of water in kPa, not mmHg, so we needed the conversion for that, too.

560 mmHg corresponds to about 74.66 kPa. The attached "Buck equation" formula is used to find the corresponding temperature. The exponential equation could be solved algebraically using logarithms and the quadratic formula, but we choose to find the solution graphically.

Water boils at about 91.7 °C on Mt. Whitney.