When an element exist in nature by itself, it must have a charge of

D=___g/mL v=100mL m=1.5kg=___g

Consider the steps in coal gasification: C (coal) + H2O (g) → CO (g) + H2 (g) ΔH°rxn = 129.7 kJ CO (g) + H2O (g) → CO2 (g) + H2 (g) ΔH°rxn = - 41 kJ CO (g) + 3H2 (g) → CH4 (g) + H2O (g) ΔH°rxn =

What is the name of Cr2S3

Lana balanced an equation so that the result was 2C2H3Br + 5O2 → 4CO2 + 2H2O + 2HBr. Which most likely represents the starting equation

Calculate the standard cell potential at 25 ∘c for the reaction x (s) + 2y + (aq) →x2 + (aq) + 2y (s) where δh∘ = - 793 kj and δs∘ = - 319 j/k. express your answer to three significant figures and include the appropriate

The element rubidium has two naturally occurring isotopes. The atomic mass of 85Rb (72.17 percent abundant) is 84.911794 amu. Determine the atomic mass of 87Rb (27.83 percent abundant). The average atomic mass of Rb is 85.4678 amu.

Describe what you can do to slow down, or stop the continuous negative human treatment of our aquatic biomes.

If the hydrogen ion concentration is 10-7M, what is the pH of the solution? Show all work.

When it is raining water is returning to earth as a water cycle stage called

How many moles are in 1.50 grams of ethanol, CH3CH2OH?