General Chemistry Answers

If a 25.0 L sample of gas at C is heated, what is the new sample of the gas at constant pressure?

Determine the molarity of 2.50 x 10^-6 kg of potassium phosphate in 500.0mL of solution

I. A student calculated the molarity of a solution prepared by dissolving 0.730 mol of table sugar (sucrose, C₁₂H₂₂O₁₁) in 1.8x10^3 mL of water as 4.06x10^-4 M C₁₂H₂₂O₁₁. 

• Explain the student's calculation error and explain how the student should solve for the correct value of molarity. Show a valid calculation for the molarity.

II. The student then takes a 1.00 M stock solution of table sugar (sucrose, C₁₂H₂₂O₁₁) and mixes 0.305 L of stock solution with additional distilled water to create a dilute solution with a total volume of 1.25 L. 

• Explain how the student can determine the molarity of the resulting solution. Show a valid calculation for the final molarity.

The student then takes a 1.00 M stock solution of table sugar (sucrose, C₁₂H₂₂O₁₁) and mixes 0.305 L of stock solution with additional distilled water to create a dilute solution with a total volume of 1.25 L. 

if 280.0 mL of an HCI s will neutralize 310.0 mL of 0.45 M NaOH what is the concentration of the acid

Write the short note on " Introduction Periodic Table"

Cocaine (C17H21O4N; Figure 2) is a natural substance found in leaves of the coca plant, which have been used for centuries as a local anaesthetic and stimulant. Illegal cocaine arrives in the USA either as the pure compound or as the hydrochloride salt (C17H21O4NHCl). At 25oC, the salt is very soluble in water (2.50 kg/L), but pure cocaine is much less so (1.70 g/L). a. What is the maximum amount of the salt (in gram) that can dissolve in 50.0 mL of water?

b. When a 25 mL aqueous solution that contains 62.50 g of the salt is treated with NaOH, the salt is converted to pure cocaine. How much water (in litres) is needed additionally to dissolve the formed pure cocaine? C17H21O4NHCl(aq) + NaOH(aq) → C17H21O4N(aq) + H2O(l) + NaCl(aq)

What is HA considered ?

I need to make 15.0 mL of 0.20M NaOH from 3.0M NaOH stock solution. How do I make the solution? And I need to tell how to make the solution.

I need to make 200.0 mL of 3.00M NaOH for a titration lab. How many grams of powdered lye (NaOH) should I put in a 200.00 mL volumetric flask?