A chemist must prepare 550.0mL of nitric acid solution with a pH of 0.90 at 25°C. He will do this in three steps: Fill a 550.0mL volumetric flask about halfway with distilled water. Measure out a small volume of concentrated (7.0M) stock nitric acid solution and add it to the flask. Fill the flask to the mark with distilled water. Calculate the volume of concentrated nitric acid that the chemist must measure out in the second step. Round your answer to 2 significant digits.

Both josef loschmidt and amedeo avogadro contributed to our understanding of basic molecular numbers, sizes, and reaction ratios. neither scientist discovered “avogadro’s number” in the form we use it today (6.02 x 10 23). still, there’s a controversy over the name. research the contributions from these two scientists and read about how avogadro’s number got its name. briefly state what you think this number should be called, providing key details of each scientist’s contributions to this concept and a solid rationale for your case in naming the number.

How many miles of water are produced if 5.43 mol pbo2 are consumed

Apiece of metal with a length of 1.42 cm was measured using four different instruments. which of the following measurements is the most accurate?