HELP PLEASE What about winter temperatures of 0 and -3? …………….% 28 and 15? ……………….%

100mg magnesium reacts with 20ml of 1.0m hcl

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

Estimate the molar mass of the gas that effuses at 1.6 times the effusion rate of carbon dioxide.