four gases were combined in a glass cylinder with these partial pressures:3.5 atm N2,2.8 atm, 0.25 atm At and 0.15 atm He. What is the mole fraction in the mixture? What is the mole fraction of Ar in the mixture?

How to balance this equation: Cu (s) + O2 (g) - - > CuO (s)

What is the mass of 2.0 moles of CO2

Which of the following is not true regarding an acid? a. can donate a proton (H+) to some other substance b. can accept a proton (H+) from some other substance c. releases hydrogen ions (H+) when dissolved in water d.

You are given a glass of common salt solution suggest a method to separate common salt and water. note : assume that all the common salt has dissolved in water

What is the formula for Potassium Oxide

How do scientist know that atoms and molecules combine in well-ordered arrays?

Explain why potassium and argon react together

Which indicator will be the same color in hydrochloric acid as it is in pure water? 1. methyl orange 2. phenolphthalein 3. bromcresol green

Based on your knowledge of energy resources conservation, which of the following statements is true? a) Manufacturers can increase a light bulb's energy efficiency by using technology that decreases the amount of electromagnetic energy the bulb

Ammonia (nh3 (g), hf = - 46.19 kj/mol) reacts with hydrogen chloride (hcl (g), hf = - 92.30 kj/mol) to form ammonium chloride (nh4cl (s), hf = - 314.4 kj/mol) according to this equation: