Question

Identify the unknown element for the gas XH3 from the following information: P = 2.50 atm, T = 300.15 K, d = 3.45 g/L.

N, P , As , Sb , or Bi

What is the mass percentage of iron in an iron ore sample that is 1.34 g if 22.0 mL of 0.500 M HCl was used in a titration set up? The unbalanced reaction for this reaction is:

HCl(aq) + Fe(s) → FeCl3(aq) + H2(g)

45.8%

91.7%

30.4%

1.27%

15.3%