How much heat is needed to change 4 g of water at 100 oC to steam at 100 oC?

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Answer 1 · 2018-06-24T01:52:04

#8920# joules of heat energy.

We use the latent heat of vaporization equation, which states that:

#q=mL_v#

where:

#q# is the heat energy supplied in joules

#m# is the mass of the substance

#L_v# is the latent heat of vaporization of the substance

Here, we got: #m=4 \ "g",L_v=2230 \ "J/g"#. (source: https://www.britannica.com/science/latent-heat)

So, the amount of heat required is:

#q=4color(red)cancelcolor(black)"g"*(2230 \ "J")/(color(red)cancelcolor(black)"g")#

#=8920 \ "J"#