1.

State the meaning of 'latent heat of vaporation of water is 537 calg-1​

Answer» <html><body><p><strong>Answer:Heat added or subtracted for a phase change = Latent heat x Mass</strong></p><p><strong></strong></p><p><strong></strong></p><p><strong>Q = L heat M</strong></p><p><strong></strong></p><p><strong>Where,</strong></p><p><strong></strong></p><p><strong>Q = heat (calories or joules)</strong></p><p><strong></strong></p><p><strong>L heat = latent heat (calories/<a href="https://interviewquestions.tuteehub.com/tag/gram-1010695" style="font-weight:bold;" target="_blank" title="Click to know more about GRAM">GRAM</a> or joules/gram)</strong></p><p><strong></strong></p><p><strong>M = mass (grams)</strong></p><p><strong></strong></p><p><strong>If liquid water at 100°C is changed into steam, the heat added (the latent heat of vaporization) is <a href="https://interviewquestions.tuteehub.com/tag/540-325109" style="font-weight:bold;" target="_blank" title="Click to know more about 540">540</a> calories for every gram of water. If steam at 100°C is changed into the water at 100° C, 540 calories for every gram of steam <a href="https://interviewquestions.tuteehub.com/tag/must-2185568" style="font-weight:bold;" target="_blank" title="Click to know more about MUST">MUST</a> be subtracted. If ice at 0°C is changed into liquid water at 0°C, the heat added (the latent heat of melting) is 80 calories for every gram of ice. If liquid water at 0°C changes into ice at 0°C, 80 calories for every gram of liquid water must be subtracted.</strong></p><p><strong></strong></p><p><strong></strong></p><p><strong>Latent heats can be very large. For example, the latent heat of vaporization of water is 540 cal/g and the latent heat of freezing of water is 80 cal/g. Therefore, changing a given quantity of water to steam <a href="https://interviewquestions.tuteehub.com/tag/requires-7264857" style="font-weight:bold;" target="_blank" title="Click to know more about REQUIRES">REQUIRES</a> 5.4 times as much heat as <a href="https://interviewquestions.tuteehub.com/tag/warming-1449001" style="font-weight:bold;" target="_blank" title="Click to know more about WARMING">WARMING</a> it from 0°C (+32°F) to 100°C (212°F), and melting ice requires as much heat as warming water from 20°C (68°F) to 100°C.</strong></p><p></p><p><strong>Step-by-step explanation:</strong></p><p></p></body></html>


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