Calculate the empirical formula of a compound with the following

percentage composition: 31,8% K; 29,0% C1; 39,2% O

The empirical formula of ethane is CH. Its molar mass is 30 g. mol-

Explain how you could use Avogadro's Law given the grams of a known compound and volume.

The volume of oxygen, collected over water, is 185 mL at 25 degrees Celsius and 600 torr. calculate the dry volume of the oxygen at STP (for the question, you have to convert from mL to L, Celcius to Kelvin, and torr to atmospheres)

The atmospheric pressure of a cold winter day in NYC is 25.94 InHg. Calculate this value in Pa.

Which family or group is made of elements with almost full electron energy levels?

An unbalanced chemical equation is shown: 2CaO + 2H2O → Ca (OH) 2 Which of the following statements explains why the equation is not balanced? Four molecules of Ca (OH) 2 should be produced during the decomposition reaction.

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?