Atom x has an atomic number of 19 and has a mass number of 39. the number of protons in atom x is equal to

Empirical formula for H2Cl2O6

2.0 L HC2H3O2 (acetic acid) is made by diluting 75. mL of 17.6M acetic acid. What is the molarity of the new solution?

In the context of neurotransmitters, which of the following best describes the effect of norepinephrine stimulation?

How many protons (p) and neutrons (n) are in an atom of sr? 38 p, 90 n 90 p, 38 n 38 p, 52 n 52 p, 38 n?

A 3.33-L flask is filled with propane gas (C3H8), at 1.00 atm and - 24.5°C. What is the mass of the propane in the flask?

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?