Skip to main content

How many joules are required to boil 150.0 grams of water?

To boil a given quantity of water, we need to supply some heat to it. The amount of heat needed to increase the temperature of any substance is dependent on the mass of the substance, its specific heat capacity and the change in temperature. The specific heat capacity of a substance is defined as the amount of heat needed to raise the temperature of 1 g of the substance by 1 degrees C. The specific heat capacity of water is 4.184 J/g/K.

Let's say we have to find the amount of energy needed to raise the temperature of 150 g of water 75 degrees Celsius. For the equation, I'll say water at 25 degrees Celsius must be heated to 100 degrees Celsius, the boiling point of water. To convert degrees Celsius to degrees Kelvin, add 273 to the Celsius value. 25 degrees Celsius is 298 degrees Kelvin; 100 degrees Celsius, 373 degrees Kelvin.


This can be calculated as:


energy needed = mass of water x specific heat capacity of water x temperature change 


= 150 g x 4.184 J/g/K x (373 - 298) K = 47,070 J.


Thus, 47,070 J are needed to increase the temperature of 150 g of water from 25 degrees C to its boiling point of 100 degrees C. 


One can follow a similar procedure to determine the energy needed to heat water from one temperature to another. Note that phase change is not taking place in the current case. If the water were to be converted to steam, we will also need to include the heat energy needed for phase change.


Hope this helps.

Comments

Post a Comment

Popular posts from this blog

Can you analyze the poem "Absolution" by Siegfried Sassoon?

Sure! Siegfried Sassoon fought in World War I and was wounded in battle; he spent much of his life speaking out against war, and these pacifist feelings are easy to see in his poems. This one, "Absolution," was published in 1917, the same year that Sassoon was hospitalized for what we know today as post-traumatic stress disorder. "Absolution" is a short poem that contains three stanzas of four lines each. The word "absolution" means "forgiveness," and... Sure! Siegfried Sassoon fought in World War I and was wounded in battle; he spent much of his life speaking out against war, and these pacifist feelings are easy to see in his poems. This one, "Absolution," was published in 1917, the same year that Sassoon was hospitalized for what we know today as post-traumatic stress disorder. "Absolution" is a short poem that contains three stanzas of four lines each. The word "absolution" means "forgiveness," and the v...
Post a Comment
Read more

How and why does James Gatz become Jay Gatsby? Describe the young Gatsby/Gatz.

James Gatz, a poor Midwestern boy of probable Jewish lineage, becomes Jay Gatsby, a presumed WASP and wealthy socialite, when he moves to New York City and acquires his fortune. It is wealth that has allowed Gatz to transform himself into Gatsby. However, those who know his background (e.g., Daisy and Tom Buchanan) never allow him to forget that he is nouveau riche -- that is, an upstart who has just recently made his fortune,... James Gatz, a poor Midwestern boy of probable Jewish lineage, becomes Jay Gatsby, a presumed WASP and wealthy socialite, when he moves to New York City and acquires his fortune. It is wealth that has allowed Gatz to transform himself into Gatsby. However, those who know his background (e.g., Daisy and Tom Buchanan) never allow him to forget that he is nouveau riche -- that is, an upstart who has just recently made his fortune, whereas they arose from well-to-do families. Gatz became Gatsby through determination and discipline. At the end of the novel, the narr...
Post a Comment
Read more

In chapter one of The Great Gatsby, what advice does Nick's father give him? How does this make him a good person to tell this story?

Nick says that his father advised him that, before "criticizing anyone," he "remember that all the people in this world haven't had the same advantages" as Nick.  As a result, Nick claims that he is "inclined to reserve all judgments," presenting himself to the reader as a fair and dispassionate arbiter of character, and thus, a reliable narrator.   The problem is that Nick immediately reveals himself as anything but reliable, as he then launches... Nick says that his father advised him that, before "criticizing anyone," he "remember that all the people in this world haven't had the same advantages" as Nick.  As a result, Nick claims that he is "inclined to reserve all judgments," presenting himself to the reader as a fair and dispassionate arbiter of character, and thus, a reliable narrator.   The problem is that Nick immediately reveals himself as anything but reliable, as he then launches into a discussion of how pe...
Post a Comment
Read more