A chemist weighed out 19.9 g of aluminum. Calculate the number of moles of aluminum she weighed out.

Joshua dissolved sugar in water to create a sugar solution. His friend Ray tells him it's a compound, but Joshua corrects him. Which words actually describe the sugar solution?

If 15.98 mL of 0.1080 M KOH solution reacts with 52.00 mL of HC2H302, what is the molarity of the acid solution? (Don't forget significant figures) KOH + HC2H302 - KC2H302 + H2O

Me pueden ayudar a representar este enlace molecular : HCN

What is the empirical formula of a substance that is 53.5% C, 15.5% H, 31.1% N?

Which of the following hydrocarbons will most likely be found around cows? A. ethane B. methane C. octane D. decane

Identify the spectator ions in the following complete ionic equation. 2k (aq) s2 - (aq) pb2 (aq) 2no-3 (aq) →pbs (s) 2k (aq) 2no-3 (aq) express your answers as ions separated by a comma.

4. A bird left its post and flew in a triangular path. It flew 21 yards south, 72 yards east and 75 yards diagonally to end back at the post. Is it a right triangle?

Condension occurs in the inside of your windows in Winters, why?

How can you use Hess's law to determine a reaction's enthalpy?

7. How much energy in KJ is released when 15.0 g of steam at 100.0 degrees Celsius is condensed and then frozen to ice at 0.0 degrees Celsius?