# Chemistry

How many joules are required to raise the temperature of 450mL of water from 30 °C to 100 °C?

The specific heat of copper metal is 0.385 J/ g- K. How many KJ of heat needed to raise the temperature of 1.1 kg block of copper from 27.5 C to 50 C?

If 200 J of heats is added to 25 g of iron at a temperature of 15 °C, what will be the final temperature?

A hot piece of iron with a mass of 75g and a temperature of 200 °C, is dropped into 250g of cool water at a temperature of 18° C. What is the final temperature of the water and the iron?

When 1.00g of sodium hydroxide is dissolved in 100 g of water in an insulated container the temperature rises from 20.0° C to 22.66° C. Calculate the enthalpy for the solution. State by assumptions made.

Calculate change in enthalpy when 100 mL of 1.0 mole/dm NaOH is added to 100 mole/dm HCl in an insulated container the temperature rises from 21.0° C to 34.6 °C.

How much heat will release when 6.44g of sulfur reacts with excess O2 according to the following equation?
2 S + 3 O2 > 2 S 3 H = -791.4 KJ

How much heat will be absorbed when 38.2g of bromine reacts with excess H2 according to the following equation?
H2 + Br2 > 2 HBr H= 72.80 KJ

An experiment was carried was carried out to determine the amount of energy released in a low fat chocolate bar with a the mass 50.0g. the complete combustion of a 10.0 g of the bar raised the temperature of 500.0g of water from 19.0° C to 86.5 °C. calculate the energy value ( KJ )of the chocolate bar.

How much heat will be transferred when 5.81g of graphite reacts with excess hydrogen according to the following reaction? Is this reaction endothermic or exothermic?

1. 👍 0
2. 👎 0
3. 👁 550
1. you are dreaming thinking you can dump homework here.

1. 👍 0
2. 👎 0

## Similar Questions

1. ### chemistry

Approximately how many joules of heat are needed to raise the temperature of a 4.0-gram sample of water to 8.0C? that is all of the information that was provided

2. ### chemistry

How many joules of heat energy are required to raise the temperature of 20 grams of water by 50°C?

3. ### Chemistry

Approximately how many joules of heat are needed to raise the temperature of a 4.0-gram sample of water to 8.0C?

4. ### Chemistry

The heat capacity of lead is 0.13 J/g•°C. How many joules of heat would be required to raise the temperature of 15 g of lead from 22°C to 37°C?

1. ### chem

How much energy in joules does it take to raise the temperature of 255g of water by 12.5 C? pls help!

2. ### Chemistry

Imagine that your water heater has broken, but you want to take a bath. You fill your bathtub with 25kg of room-temperature water (about 25C). You figure that you can boil water on the stove and pour it into the bath to raise the

3. ### chemistry

* A 50 gram sample of an unknown metal warms from 18 to 58 after absorbing 800 joules of energy. what is the specific heat of the metal? *copper has a specific heat of 0.387 j/g degree celsius. what is the mass of a piece of

4. ### chemistry

A) How much energy is released when 25.0 g of steam condense to liquid H2O at 100°C? B) If it takes 1215J of heat to raise the temperature of water 11.C, how much does the water weigh, in grams? C) How many joules of heat does it

1. ### Physics Hear

1) Peter is heating water on the stove to boil eggs for a picnic. How much heat is required to raise the temperature of his 10.0-kg vat of water from 20.0℃ to 100.0℃? Formula>> Q=mTcp 2)Under the spreading chestnut tree of the

2. ### Physics

The oven draws 1100W of power, and you have determined that it heats with an efficiency of 51%. Using this information, determine the time t it would take to bring 240mL of water from 25C to 100C . Note that 4.2 J of energy is

3. ### Physics

How long would it take a kettle with a 1kW heating element to heat 1 litre of water? Watts = Joules / second • Mass of 1 litre of water = 1kg • 1 kW = 1 k Joule / second or 1000 joules/ second • 1g of water needs 4.184J to

4. ### Chemistry

How many joules of heat are required to raise the temperature of 550 g of water from 12°C to 18°C