Deduce a value for the latent heat of evaporation Lv of water. State clearly any simplifying assumptions that you make. Estimate the pressure at which ice and water are in equilibrium at −2◦C given that ice cubes float with 4/5 of their volume submerged in water at the triple point (0.01◦C, 612Pa). [Latent heat of sublimation of ice at the triple point, Ls = 2776 °´ 103 Jkg−1.]

For a particular reaction, ? h = -144.6 kj and ? s = -301.2 j/k. calculate ? g for this reaction at 298 k.

Laboratory experiments, observational field studies, and model-building are all examples of different forms of scientific investigations.  in what way do laboratory experiments primarily differ from other forms of scientific investigations?   a.  a laboratory experiment is the only accepted form of investigation within the scientific community.  b.  studies about how things behave in nature or studies involving very large objects are best answered through laboratory experiments.  c.  laboratory experiments involve the identification and control of variables.  d.  data can only be generated through laboratory experiments, not other forms of investigation.

A100-watt light bulb illuminates a solar cell. the electricity from the solar cell operates a water pump that delivers 1 watt of power. what is the efficiency of the system?