Answer Happy

In the Gas Laws-Mass Percent Hydrogen Peroxide experiment, what would be the mass % hydrogen peroxide in a solution if 0.0385 moles of O2 was produced by 9.054 g H202 solution? O 30% O 0.289% 0 28.9% 0 3%
A student is doing the Gas Laws-Mass Percent Hydrogen peroxide experiment and collects 62.7 mL of gas in the upside-down graduated cylinder. If the room pressure and temperature are 755.7 torr and 20.0 C, respectively, how many moles of oxygen were collected? 0 386 mol O2 O 0.00259 mol O2 O 0,00253 mol O2 0 395 mol O2
In the Reaction of lodine with Zinc experiment, how do you know when the reaction is complete? O The brown color in the solution disappears. The solution turns brown. The solid zinc is all gone. O The solid turns white.
In the "Reaction of lodine with Zinc" experiment, why is it dangerous to use Bunsen burner? O The reaction produces a flamable gas. O The solvent fumes are flammable. O It is not. O The products of the reaction will decompose.
If 25.00 mL of vinegar is titrated to the equivalence point with 14.17 mL of 0.1122 M sodium hydroxide solution, what is the molar concentration of the acetic acid in the vinegar? O 0.3167 M. O 0.1122 M. O 0.06359 M 0 0.1980 M.
What is the wavelength of the light transmitted when an electron transitions from n = 5 to n = 4? 0 2.469 x 103 m X m 0 4.050 x 10-4 m X 0 2.469 x 101 m Х 0 4.050 x 10-6 m x
You synthesize magnesium oxide by heating magnesium in a crucible. Calculate the experimental % magnesium in magnesium oxide given the following mass data: empty crucible and lid: 24.181 g crucible and lid with magnesium: 24. 337 g crucible and lid with product: 24.452 g 0 99.5% 0 42.4% 0 57.6% 0 42.435%
H2SO4 and 50.0 mL of 1.00 M NaOH, a student measures the initial temperatures of the sulfuric acid and sodium hydroxide solutions to be 22.5 C and 21.9 C, respectively. If the final temperature of the mixture (after the reaction) is 28.8 o C, calculate the molar enthalpy of this reaction, in kJ/mol.