What is the potential energy of 4kg object sitting on a 3m ledge?

A 250 mL sample of nitrogen (N2) has a pressure of 745 mmHgat 30 ∘C. Find the mass .

Which reaction is endothermic?

Why is alloy stainless steel used instead of pure iron for the ball of pen of pure iron for a ball of pen

Burning coal produces what type of gas? oxygen hydrogen carbon dioxide nitrogen

Calculate the pH of a solution that is 0.147M HCl

Sound waves travel fastest through? A.) Air B.) Steel C.) Water D.) Vacuum

Which of the following combinations will result in a reaction that is never spontaneous? 1) positive enthalpy change and positive entropy change 2) positive enthalpy change and negative entropy change 3) negative enthalpy change and positive entropy

Which of the formed elements is present in the greatest concentration?

A compound has a percent composition of 24.74% potassium (molar mass = 39.10 g/mol), 34.76% manganese (molar mass = 54.94 g/mol), and 40.50% oxygen (molar mass = 16.00 g/mol).

What would be the saturation concentration (mole/L) of oxygen (O2) in a river in winter when the air temperature is 0°C if the Henry's law constant at this temperature is 2.28 * 10-3 mole/L-atm? What would the answer be in units of mg/L?