Water at 15°C enters the condenser at X. Predict the temperature of the water when it leaves the condenser at Y.

Can someone me with questions 12 and 13 plz.

Significant figures are digits read directly from the measuring instrument plus one more digit, which is __ by the observer.

The following reaction shows sodium carbonate reacting with calcium hydroxide. na2co3 + ca(oh)2 → naoh + caco3 how many grams of naoh are produced from 20.0 grams of na2co3? (molar mass of na = 22.989 g/mol, c = 12.01 g/mol, o = 15.999 g/mol, ca = 40.078 g/mol, h = 1.008 g/mol) 12.2 grams 15.1 grams 24.4 grams 30.2 grams