sample of gas in a 0.25 L container has a mass of 0.433g at 0.98atm and 28°C. what's the molar mass in g/mol?

What caused the little puddle of water to appear under the syringe tip?

An unkown element has been found to occur in two different stable isotopes. One isotope has an abundance of 57.21 percent and has a mass of 120.9 amu. The other isotope has an abundance of 42.79 percent and has a mass of 122.9 amu.

United States France France Spain Spain Dutch Republic Flag of the Iroquois Confederacy. svg Oneida tribe Flag of the Iroquois Confederacy.

For the reaction 2ch4 (g) ⇌c2h2 (g) + 3h2 (g) k = 0.135 at 1615 ∘c. what is kp for the reaction at this temperature?

What determines the temperature of an object at the molecular level?

Suppose that you measure a pen to be 10.5 cm long. Convert this to meters.

How are amounts of hydrogen and oxygen gas made from the electrolytic decomposition of water related to the chemical formula of water?

Hydrogen peroxide decomposes to water and oxygen at constant pressure by the following reaction: 2H2O2 (l) → 2H2O (l) + O2 (g) ΔH = - 196 kJ Calculate the value of q (kJ) in this exothermic reaction when 3.

What is the concentration of hydronium in each of the following cases: [OH-] = 10-12 M? [OH-] = 10-2 M?

Which statement best explains why elements are matter? An element is a physical substance that has mass and takes up space. Elements are pure substances that cannot be divided chemically. Each element is a pure substance composed of one type of atom.