Chemistry

How many joules of energy are needed to change 275 g of water from 15°C to steam at 100.°C?

1. 👍 0
2. 👎 0
3. 👁 492
1. q1 = heat needed to raise T from 15 C to 100 C.
q1 = mass H2O x specific heat H2O x (Tfinal-T(intial)

q2 = heat need to change liquid H2O to vapor.
q2 = mass H2O x heat vaporization
Total Q = q1 +q2

1. 👍 0
2. 👎 0

Similar Questions

1. Science

A 54-kg jogger is running at a rate of 3m/s. What is the kinetic energy of the jogger. A. 18 Joules B. 81 Joules C. 162 Joules D. 243 Joules

2. physics

An object with a mass of 5 kg is thrown with an initial velocity of 6 m/s. If the object has an initial height of 10 meters above the ground, what is the magnitude of the initial gravitational potential energy of the object? The

3. college chemistry

CH4 + 2 Cl2--> CH2Cl2 + 2HCl Cl-Cl bond energy: 242 kj/mole 1. Calculate the amount of energy (Joules) needed to break a single Cl-Cl bond. 2. Calculate the longest wavelength of light (meters)that can supply the energy per photon

Which of the following is not needed to make a model of the water cycle? an energy source water a closed container a drain Which of the following explains why water is a limited resource? Water is present on Earth in a fixed

1. 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

2. chemistry

Calculate how many joules of (total) heat energy are needed to convert the ice at -25.0 *C to steam at 100.0 *C?

3. physics

15 joules of work are done by forces other than gravity in taking an object from a position 3 m above the ground to a position 8 m above the ground. What is the change in the gravitational potential energy of the object? o A. It

4. Chemistry

find the heat energy needed to change 200 g of water at 4c to water at 88c

1. physics

What is the initial electric potential energy of an electron leaving a 200-volt battery if the charge of an electron is 1.602×10−19 coulombs? 8.01×10−20 joules 3.204×10−19 joules 8.01×10−22 joules 3.204×10−17 joules

2. Physics

Calculate the specific heat of a metallic element if 314 joules of energy are needed to raise a 50.0 g sample from 25 to 50 degress C ? :)

3. Physics-is this correct?

A person heats up a can of soup on a stove. If he does 250 joules of work on the soup by stirring it as the burner adds 1675 joules of heat, what is the change in its internal energy? I took 1675j - 250 j = 1425j

4. physics

An object has a gravitational potential energy of 24 joules when it rests on a shelf 3 m above the ground. What would be its gravitational potential energy when it is lowered to a shelf 1 m above the ground? o A. 8 joules o B. 12