Which equation obeys the law of conservation of mass? H2 (g) + O2 (g) → H2O (g) H2 (g) + O2 (g) → H2O (g) + 4He (g) 2H2 (g) + O2 (g) → 2H2O (g) H2 (g) → H2O (g) H2 (g) + O2 (g) → 2H2O (g)

A chemist adds 395.0 mL of a 1.4M sodium chloride (NaCI) solution to a reaction flask. Calculate the mass in grams of sodium chloride the chemist has added to the flask. Round your answer to 2 significant digits. 10

The burning of a sweet potato sample generates 102.5 kJ of heat. This heat was used to raise the temperature of 300 grams of water from its initial temperature of 15.5 degrees Celsius. Considering the specific heat of water is 4.

Write the chemical equation for the following word equation: Potassium metal and chlorine gas combine to form potassium chloride.

A chemist designs a galvanic cell that uses these two half-reactions: half-reaction standard reduction potential (aq) (aq) (g) (aq) (l) Answer the following questions about this cell.

Convert a volume of 3.5 m3 to cubic centimeters.

How much ice at a temperature of - 17.5 ∘C must be dropped into the water so that the final temperature of the system will be 31.0 ∘C?

Why does a gas fill completely the vessel in which it is kept?

Individuals who work full time and those who work part-time enjoy basically the same number of paid leave benefits. True False

There is a large increase in ionization energy between the second and the third ionization energies of a metal. What kind of ion is the metal likely to form? Include the charge in your answer.

Which of the following are true statements about equilibrium systems? For the following reaction at equilibrium: CaCO3 (s) ⇌ CaO (s) + CO2 (g) adding more CaCO3 will shift the equilibrium to the right.