Thursday

November 27, 2014

November 27, 2014

Posted by **maria** on Saturday, October 26, 2013 at 7:41pm.

water. Calculate the mass of natural gas that

would need to be burned to heat the water

for a tub of this size from 56 ◦F to 87 ◦F.

Assume that the natural gas is pure methane

(CH4) and that the products of combustion

are carbon dioxide and water (liquid).

Answer in units of g

2nd part

What volume of natural gas does this correspond to at 30◦C and 1 atm?

Answer in units of L

- chemistry -
**DrBob222**, Saturday, October 26, 2013 at 8:30pma.

1. Convert F to C. Convert 106 gallons H2O to L, assume density of 1.0 g/mL and convert L to grams.

2. Calculate q = heat required to heat the water as described.

q = mass H2O x specific heat H2O x (Tfinal - Tinitial).

3. Write and balance the equation for the combustion of CH4.

CH4 + 2O2 ==> CO2 + 2H2O

4. Calculate heat of combustion.

dHfrxn from step 2 = (n*dHf products) - (n*dHf reactants). Call this dHrxn

5. dHrxn in kJ/16g CH4 x # g CH4 = q

Solve for #g CH4

Check my thinking.

b.

Use PV = nRT and solve for V in L. You will need to plug in for n; remember n = grams/molar mass. You know g and molar mass so you can calculate n and obtain V from there.

**Answer this Question**

**Related Questions**

AP Chemistry - A typical bathtub can hold 93 gallons of water. Calculate the ...

chemistry - A cook wants to heat 1.10kg of water from 33 C to 100 C. If he uses ...

algebra - At a crime scene, police officers find a murder victim in a tub full ...

chemistry - When 47.5J of heat are added to 13.2 g of liquid, its temperature ...

algebra - At a crime scene, police officers find a murder victim in a tub full ...

Math - Lisa needs to empty 18 gallons of water from a tub into jugs that hold 0...

Language Arts - Read the following excerpt from "Saving Water." “Abandon the ...

Physics - A bathtub of icy water at 32 degrees farenheit holds 17 gallons. You ...

Physics - You decide to take a nice hot bath but discover that your thoughtless ...

algebra - You pull out the plug from the bathtub. After 40 seconds, there are 13...