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What is the molecular geometry around the indicated O atom in the molecule depicted?   

For the process: O2(g) → 2O(g)   ΔH° = 498 kJ/mol What would be the predicted sign of ΔS°rxn and the conditions under which this reaction would be spontaneous?

Which gas, helium or argon, effuses faster under the same conditions and by how much?          

A 1.0 g sample of zinc sulfide, ZnS, is mixed with 100.0 mL of pure water and 100.0 mL of a 0.100 M sodium sulfide, Na2S, solution. Which set of diagrams best represents the two solutions? The Ksp of ZnS is 3.0×10–23, and both solutions are saturated. Water molecules and sodium ions are omitted for clarity.

How many hydrogen atoms are in a 1.0 g sample of acetic acid, CH3COOH? The molar mass of acetic acid is 60.06 g/mol. NA = 6.022 x 1023 mol-1

Which figure best represents what will happen when Pb(NO3)2(aq) is treated with an excess of NaCl(aq)? Water molecules are omitted for clarity.

What is the theoretical yield (in grams) of iron(III) carbonate that can be produced from 1.72 g of iron(III) nitrate and an excess of sodium carbonate?  The molar mass of iron(III) carbonate, Fe2(CO3)3, is 291.73 g/mol, and the molar mass of iron(III) nitrate, Fe(NO3)3, is 241.88 g/mol. 2Fe(NO3)3(aq) + 3Na2CO3(aq) → Fe2(CO3)3(s) + 6NaNO3(aq)

What is the formula for the compound disulfur dichloride?

What is a correct balanced equation for the reaction shown?  

What is the total volume of gases produced when 3.0 L of nitrogen trichloride (NCl3) decomposes into chlorine and nitrogen at constant pressure and temperature? 2NCl3(g) → N2(g) + 3Cl2(g)