Achloride of this element is 67.2% chlorine by mass. in a 100 g sample how many moles of chlorine are there? (this info will be used to determine the empirical formula. because the accuracy of the result in the last question for this set of questions depends on the accuracy of this answer, use the atomic mass of cl accurate to 4 sig.

Calculate the number of kilojoules to warm 125 g of iron from 23.5°c to 78.0°c.

Solutions of sodium carbonate and silver nitrate react to form solid silver carbonate and a solution of sodium nitrate. a solution containing 3.50 g of sodium carbonate is mixed with one containing 5.00 g of silver nitrate. how many grams of sodium carbonate, silver nitrate, silver carbonate, and sodium nitrate are present after the reaction is complete?

In science class richard learns that a substance has a boiling point of 230 fahrenheit his teacher ask him to convert this temperature to degrees celsius what is the boiling point of his substance in degrees celsius