Heat of Vaporization Example Problem

Heat of Vaporization Example Problem Heat of vaporization is the amount of heat energy required to change the state of a substance from a  liquid into  a vapor or gas. It is also known as enthalpy of vaporization, with units typically given in joules (J) or calories (cal). This example problem demonstrates how to calculate the amount of energy required to turn a sample of water to steam. Heat of Vaporization Problem What is the heat in joules required to convert 25 grams of water into steam? What is the heat in calories?Useful information: Heat of vaporization of water 2257 J/g 540 cal/g Note:  You wont be expected to know enthalpy or heat values; they will be given in a problem or can be looked up in a table. Solution You can solve this problem  using either joules or calories for heat. Part IUse the formula  q m ·ÃŽâ€Hvwhereq heat energym massΔHv heat of vaporizationq (25 g)x(2257 J/g)q 56425 JPart IIq m ·ÃŽâ€Hfq (25 g)x(540 cal/g)q 13500 cal Answer The amount of heat required to change 25 grams of water into steam is 56425 joules or 13500 calories. A related example illustrates how to calculate the energy when water changes from solid ice into steam.

Your Opinion and Mine

Your Opinion and Mine In every wood in every spring there is a different green. ~ J. R. R. Tolkien (The Fellowship of the Ring) Recently theres been bru-ha-ha over Goodreads. About how readers and authors dont mix. How some authors dont like a lot of the reviews and threaten reviewers, and about how reviewers feel the latitude to crucify writers without ramifications. And I shook my head at the squabble amongst children. There are trolls out there. Ive banned them myself. Oh, you dont want my opinion? I was asked. This is just about siding with Hope Clark? I did not answer. I dont believe in arguing with children. As the persons posts  escalated, demeaning me and others, feeling free and unchecked, I just blocked her. No drama, no explanation, no last retort. My followers deserve better. My time is worth more. When you have a Facebook or Twitter account, or blog, or write op-eds anywhere, you are entitled to your opinion. Deliver it with intelligence and professionalism and expect feedback. But it crosses the line of maturity when one side or the other demands to be heard, demands to be right, and curses the other side for being different. You cannot win arguing with those people. You cant win arguing period. Because when you reach the level of arguing, which means you ditch adult debate, you are flexing your muscles saying your dad is bigger and can whip your dad. Which sounds like just what it is . . . playground banter.  Lately were even hearing about adults taking this squabble to the point of threats. I want to pinch their heads off, on both sides. Nobody able to keep their bloody mouths shut. So many wanting to snap and win. Tell me thiswhat do you win if you indeed best the other side? You dont, because youve exposed your ass to the world and you cant unsee whats been seen. Asses are rarely pretty. Ive received some silly reviews, silly in my opinion. I let them stand, mainly because I recognize that reviewer as having an opinion, too. I dont ask for explanation. Why? The majority of my reviews love the books. Thats my focus, not the oddities. Not the anomalies. Not the folks who feel empowered at a keyboard. Ill let the numbers speak. Obsessing over the one bad review undermines all the good ones, draws attention to it. Frankly, the good reviews prove that the bad review holds less value. All without arguing. I repeat . . . all without arguing. Ill respect your right to review as you please, and you respect my right to write as I please. My stories may swear, bleed or have sex. You may not like stories that swear, bleed or have sex. But I dont believe in the reviewer slashing the author, her life, or her beliefs over how she tells a tale. And I dont believe in an author doing the same against a reviewer. I know where you live, has no place in this profession, from either side. When you take it personal, you show the world you have a thin skin, and that your focus is not where it should be . . . on reading and writing good books.