Friday

April 18, 2014

April 18, 2014

Posted by **Angel** on Sunday, September 18, 2011 at 11:42pm.

(a) Calculate the expected water temperature at 5-minute intervals for the first 60 minutes after the flow of cold water is established

( I have no idea how to solve this problem am completely lost on the equation use and everything please help)

- Excel Problem -
**DrBob222**, Monday, September 19, 2011 at 12:24amheat lost by hot water + heat gained by cold water = 0

initial volume = 3000 L

30 L/min x 5 min = 150L

[mass cold water x specific heat x (Tfinal-Tinitial)] + [mass warm water x specific heat x (Tfinal-Tinitial)] = 0

You know mass cold water (150L = 150kg

You know specific heat water

You know initial T of warm water = 46 C

You know initial T of cold water = 1.7 C.

The only unknown is Tfinal. You can calculate that at 0 min = 46 C

First 5 minutes given by above equation. The next 5 min interval is done the same way.

- Excel Problem -
**Angel**, Monday, September 19, 2011 at 12:55amthe formula giving was T= Tin. - (Tin. - Tint.)e (-v/v)

Where Tin = 1.7 degrees C

and Tin is the to the temperature of the cold water flowing into the tank

**Related Questions**

Chemstry/(microsoft excel) - I am having a hard time solving this problem. The ...

Chemistry - When 112 g of water at a temperature of 22.5°C is mixed with 65.1 g ...

Thermodynamics - The initial state consists of a closed system containing one ...

Chemistry - I am having a hard time solving this problem. The formula given is...

Chemistry - C2H6 --> 2CH3 at a temperature where the half-life is 21 minutes...

Chemistry - A coffee cup calorimeter contains 25.0 grams water at 23.8 C A 5.00g...

Data Analysis - I have a mathematical problem that I don't know how to solve in ...

Chemistry - The final temperature of a material was 315K and delta T was 15 ...

more physics. - What change in entropy occurs when a 27.9-g ice cube at -12 C is...

chemistry - 60.5 grams of iron at an initial temperature of 87.5 degrees celsius...