Other Chemistry Answers

write a chemical equation that represents the complete combustion of a compound that is 34.64% C, 13.86% H, and 51.50% O by mass. How much of the compound is needed to produce 10.1 of the gaseous product as STP

Pls Help me

Assign oxidation number to all atoms in each of the following: (10pts)

1.    AuCl₃         Au = ____     Cl = ____
2.    H₂O₂          H = ____    O = ____
3.    O₃            O = ____
4.    Na₂C₂O₄        Na = ____   C = ____    O = ____
5.    SO₃             S = ____    O = ____

4. A concentration cell is constructed by placing identical Cu electrodes in two Cu²⁺ If the concentrations of the two Cu²⁺solutions are 1.0 M and 0.0020 M, calculate the potential of the cell. (3pts)

5. Calculate the potential (in volts) for the voltaic (or galvanic) cell indicated at 25^o (3pts)

Ga | Ga³⁺ (10^-6 M) || Ag⁺ (10^-4 M) | Ag

In a hypothetical element, two energy levels are separated by an energy of 282 kJ mol^-1. What wavelength of light (in nm) is involved for an electron to change between these two levels?

Why is Europe there so many ingredients banned than in the US, where there are only 11? And why do people think parabens are harmful?

1.                  A 0.00453 L of sodium chloride solution was needed in a 560 mg sample that assayed 87.1% (w/w) Na₂SO₄. Calculate the molar concentration of sodium chloride in the solution.