Air has 21% oxygen by volume. Oxygen has a density of 1.31 g/L. What is the volume in liters of a room that holds enough air to contain 55 kg of oxygen

What is the pH of a buffer solution that is 0.211 M in hypochlorous acid (HClO) and 0.111 M in sodium hypochlorite? The Ka of hypochlorous acid is 3.8 ⋅ 10-8. What is the pH of a buffer solution that is 0.211 M in hypochlorous acid (HClO) and 0.

You perform an experiment and proceed to recrystallize the product in an ethanol:water solvent mixture. why is a mixed solvent system used instead of just one component or the other?

Exam number: 007170RR Exam Guidelines Exam Instructions Question 9 of 20: Select the best answer for the question 9. When all parts of a circuit are composed of conducting materials, the circuit is said to be A. open B. parallel C. closed. D.

As a technician in a large pharmaceutical research firm, you need to produce 300. mL of 1.00 M a phosphate buffer solution of pH = 7.36. The pKa of H2PO4 - is 7.21. You have 2.00 L of 1.00 M KH2PO4 solution and 1.50 L of 1.

If you want to affect chromatin packaging, which amino acid could you mutate to affect both histone acetylation and methylation patterns?

Which ionic compound is water soluble? A. cuS B. NH4NO3 C. SrSO4 D. ZnF

What is part of an experiment that is not being tested and is used for comparison

Is hydrogen sulfide a heterogeneous mixture solution compound or element?

Explain why people who like to stay cool on a hot summer day prefer to wear white clothing?

Which of these is a chemical property? A. Mercury is a dense liquid. B. Iodine vapor has a purple color. C. Aluminum is a very conductive metal. D. Ice melts at 0°C. E. Iron rusts in wet weather.