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What is the temperature, in Celsius, of the air if the speed is 343 m/s? How to write 0.3864 with 3 significant figures? Please explain I'm a little confused!? What is the balanced molecular & net-ionic equations for Tin + Nitric acid. I got Sn + 4HNO3 -> SnO2 + 4NO2 + 2H2O. Is this correct? How many grams of NaCl, m.w. 58.5 daltons, are necessary to make 1 liter of 5 percent saline? Calculate the velocity of an electron ejected if 700.0 nm of light is applied to the surface. Workforce= 795nm?