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In a titration, the endpoint of a neutralization reaction was reached when 28.4 mL of an HCl solution was added 17.3 mL of a 0.250 M NaOH solution.  What was the molarity of the HCl solution?

How much heat is required to raise the temperature of 60.0 mL of water from 25 degrees Celsius to 30 degrees Celsius?  

Oxygen gas reacts with barium.  What type of reaction would this be?

Given the reaction: C3H8  +  5 O2  –>  3 CO2  +  4 H2O  (all gases) At STP, what is the total number of liters of carbon dioxide produced when 5.0 L of C3H8 burns completely?

A and B are elements. In the following nuclear decay reaction: –>   10045A —> X + 9643B What does X represent?

A mixture of oxygen, nitrogen, and hydrogen gases exerts a total pressure of 74 kPa at 0 degrees Celsius.  The partial pressure of the oxygen is 20 kPa and the partial pressure of the nitrogen gas is 41 kPa.  What is the partial pressure of the hydrogen gas in this mixture?

A compound consists of 25.9% nitrogen and 74.1% oxygen by mass.  Calculate the empirical formula below.   All relevant work must be shown.  Please type in your calculations (no attachments)

2 Al(s)  +  2 H3PO4(aq)  –>  2 AlPO4(aq)  +  3 H2(g) What type of reaction is shown above?

Given the reaction: C3H8(g)  +  5 O2(g)  –>  3 CO2(g)  +  4 H2O(g) What is the total volume of water vapor formed when 8.00 L of C3H8 is completely oxidized?

Chromium metal has a specific heat capacity of 0.461J/g ° C. Calculate by how much the temperature of the sample will rise if 100. J of heat is applied to 5.00g sample of chromium at 20 ° C.  Answer: [BLANK-1] ° C (Provide your answer with correct sig. figs. and DO NOT include unit in your answer, as it has been provided)