Which of the following ratios are needed to determine the mass of oxygen produced from the decomposition of 10 grams of potassium chlorate? Select all that apply.
2KCIO3 - 2K+ 302
1 mole KCIO3/112.55 g KCIO,
112.55 g KCIO3/I mole KCIO3
3 mole 02/2 mole KCIO3
31.998 g 02/I mole 02

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

Achemist wants to extract copper metal from copper chloride solution. the chemist places 0.50 grams of aluminum foil in a solution containing 0.75 grams of copper (ii) chloride. a single replacement reaction takes place. (ii) chloride. a single replacement reaction takes place. which statement explains the maximum amount of copper that the chemist can extract using this reaction? a) approximately 0.36 grams, because copper (ii) chloride acts as a limiting reactant b) approximately 1.8 grams, because copper (ii) chloride acts as a limiting reactant c) approximately 0.36 grams, because aluminum acts as a limiting reactant d) approximately 1.8 grams, because aluminum acts as a limiting reactant

How many moles of oxygen react with 12 moles of aluminum