Chemistry Answers

Calculate the equilibrium concentration of the nonionized acids and all ions in a solution is 0.25 m in HCO2H and 0.10m in HCIO.

A scientist measures the standard enthalpy change for the following reaction to be -558.9 kJ :

H₂CO(g) + O₂(g)CO₂(g) + H₂O(l)

Based on this value and the standard enthalpies of formation for the other substances, the standard enthalpy of formation of H₂CO(g) is 

use the balanced equation to answer the following question. One pansit has a mass of 5.0 grams and one Siling Labuyo has a mass of 1.0 gram. How many Hot Pansit can be made from 40.0 grams of pansit at 26.0 grams of Siling Labuyo?

Calculate the solubility of Mg(OH)2 in 0.10 M NaOH. Calculate the solubility in grams/liter.

Calculate the mass percent of carbon, nitrogen and oxygen in acetamide, C2H5NO

Calculate the differences in energy between ΔU and ΔH for the following reactions at constant pressure at 25^oC.(use ΔH = ΔU + PΔV)

a) CH3CH2CH3(g) + 5O2(g) ⇔ 3CO2(g) + 4H2O (l)

b) C6H12O6 (s)+6O2(g) ⇔ 6 CO2(g) + 6 H2O(l)

c) Mg (s) + 2H + (aq) ⇔ Mg2(aq) + H2(g)

What is the ratio to C2H6 to O2

A sample of 89.1 g of tetraphosphorous decoxide (P4⁢O10) reacts with 49.0 g of water to produce phosphoric acid (H3⁢PO4) according to the following balanced equation.

P4O10+6H2O⟶4H3PO4

Determine the limiting reactant for the reaction.

Calculate the mass of H3⁢PO4 produced in the reaction.

Calculate the percent yield of H3⁢PO4 is isolated after carrying out the reaction.

A 5.00 L of a gas is collected at 100. K and then allowed to expand to 20.0 L. What must the new temperature be in order to maintain the same pressure (as required by Charles' Law)?

An aqueous potassium iodate stock solution is made by dissolving 6.33 mol KIO in sufficient water for the final volume of the solution to be 4.80 L.

Calculate the molarity of the stock KIO3 solution.

A 10.0 mL aliquot is removed from the described stock solution and diluted to a total volume of 100.0 mL. Calculate the molarity of the dilute solution.