用燃气灶烧水,燃烧0.5kg的煤气,使50kg的水从20度升高到70度.已知水的比热容为4.2×105J/(kg·度)煤气的热值为4.2×107J/kg.求(1)0.5kg的煤气完全燃烧放出的热量?(2)水吸收的热量?(3)燃气灶
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![用燃气灶烧水,燃烧0.5kg的煤气,使50kg的水从20度升高到70度.已知水的比热容为4.2×105J/(kg·度)煤气的热值为4.2×107J/kg.求(1)0.5kg的煤气完全燃烧放出的热量?(2)水吸收的热量?(3)燃气灶](/uploads/image/z/191966-14-6.jpg?t=%E7%94%A8%E7%87%83%E6%B0%94%E7%81%B6%E7%83%A7%E6%B0%B4%2C%E7%87%83%E7%83%A70.5kg%E7%9A%84%E7%85%A4%E6%B0%94%2C%E4%BD%BF50kg%E7%9A%84%E6%B0%B4%E4%BB%8E20%E5%BA%A6%E5%8D%87%E9%AB%98%E5%88%B070%E5%BA%A6.%E5%B7%B2%E7%9F%A5%E6%B0%B4%E7%9A%84%E6%AF%94%E7%83%AD%E5%AE%B9%E4%B8%BA4.2%C3%97105J%2F%EF%BC%88kg%C2%B7%E5%BA%A6%EF%BC%89%E7%85%A4%E6%B0%94%E7%9A%84%E7%83%AD%E5%80%BC%E4%B8%BA4.2%C3%97107J%2Fkg.%E6%B1%82%EF%BC%881%EF%BC%890.5kg%E7%9A%84%E7%85%A4%E6%B0%94%E5%AE%8C%E5%85%A8%E7%87%83%E7%83%A7%E6%94%BE%E5%87%BA%E7%9A%84%E7%83%AD%E9%87%8F%3F%EF%BC%882%EF%BC%89%E6%B0%B4%E5%90%B8%E6%94%B6%E7%9A%84%E7%83%AD%E9%87%8F%3F%EF%BC%883%EF%BC%89%E7%87%83%E6%B0%94%E7%81%B6)
用燃气灶烧水,燃烧0.5kg的煤气,使50kg的水从20度升高到70度.已知水的比热容为4.2×105J/(kg·度)煤气的热值为4.2×107J/kg.求(1)0.5kg的煤气完全燃烧放出的热量?(2)水吸收的热量?(3)燃气灶
用燃气灶烧水,燃烧0.5kg的煤气,使50kg的水从20度升高到70度.已知水的比热容为4.2×105J/(kg·度)
煤气的热值为4.2×107J/kg.
求(1)0.5kg的煤气完全燃烧放出的热量?
(2)水吸收的热量?
(3)燃气灶烧水的效率?
用燃气灶烧水,燃烧0.5kg的煤气,使50kg的水从20度升高到70度.已知水的比热容为4.2×105J/(kg·度)煤气的热值为4.2×107J/kg.求(1)0.5kg的煤气完全燃烧放出的热量?(2)水吸收的热量?(3)燃气灶
1.Q=0.5*42=21MJ
2.q=4.2*50*50*1000=10.50MJ(水的比热你可能写错了)
3.n=q/Q=10.5/21=50%.