The half life of radon-222 is 3.8 days. How much of a 100 gram sample is left after 15.2 days?

Reaction 9: Reaction of zinc and hydrochloric acid Write a complete balanced equation for the reaction

Explain the principle of infrared spectroscopy.

What volume of benzene (C6H6, d = 0.88 g/mL, molar mass = 78.11 g/mol) is required to produce 1.5 x 103 kJ of heat according to the following reaction?2 C6H6 (l) + 15 O2 (g) → 12 CO2 (g) + 6 H2O (g) ΔH°rxn = - 6278 kJ

Which form of energy is non-renewable? A. sunlight B. fossil fuels C. water D. wind

How many moles of air are there in a 3 L container at 1 atm pressure and 293 K? Use PV = nRT.

Should a bartender use ice and scoop directly from ice machine or use an ice holding device and scoop to make drinks and refill drinks from

What classification should this reaction have? 4Al + 3O2 → 2Al2O3

If you start with 100 grams of a radionuclide, how much will you have after two half-lives have passed?

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?