• 2Ca + O2 --> 2CaO What mass of calcium would be needed to release 111 KJ of energy

• How much hydrochloric acid in grams can be neutralized by 3.00 g of sodium bicarbonate?

• How many grams of F2 are needed to produce 123 g of PF3, if the reaction has a 77.2% yield?

• f the experimenter uses a thermometer that reads 1.4C too high how will this affect the calculated molar mass

• which sample of hydrogen gas at stp would ocuppy the largesr volume?

• how many grams of solute are present in 575 mL of a 2.00 M solution of HNO3

• The temperature outside is -15, and the air pressure is 0.800 . Your neighbor, who released the balloon, tells you that he filled it with 4.10 of gas. What is the volume of gas inside this balloon?

• The average concentration of strontium ion in seawater is 8.00 mg of strontium ion per kg of seawater. What is the molarity of the strontium ion if the density of the seawater is 1.025 g/mL.

• how many grams of NaOH would you need to prepare 200 ml of a 3.00 M solution?

• can you please help me with 17 and 18?

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