What is the concentration (in M) of a 20.0 mL solution made by diluting 0.010 L of 0.50 M NaCl (aq)? For credit, enter your answer to the correct number of significant digits.

In which of the following reactions is HCl being reduced?

The combustion of methane (CH4) is described by the following equation: CH4 (g) + 2 O2 (g)  CO2 (g) + 2 H2O (g) Calculate ΔHo (in kJ/mol) for the above reaction given the following information: ΔH°f  of CH4 (g)   =

Consider the hypothetical reaction: A + 2B  → C + 2D.  Calculate ΔHrxn (in kJ/mol) for the reaction given the following information:      D → A + C ΔH = 80 kJ/mol 0.5 D + C → B ΔH = –10 kJ/mol

Which has the LARGER mass?

A and B react according to the following equation: 2A + 3B ⟶ C. How many moles of B are required to react with 5.0 moles of A?  For credit, enter your answer to the correct number of significant digits.

Consider microwave radiation with a wavelength of 10 cm.  What are the frequency and energy per photon of this radiation?

A and B react according to the following equation: 2A + B ⟶ 3C.  In which of the following scenarios is A the limiting reagent? 

Consider two solutes, Solute A (Molar Mass = 40 g/mol) and Solute B (Molar mass = 80 g/mol). Which of the following solutions has the greatest molar concentration? 

Which of the following have a linear molecular geometry?