ins us ns ps 1.31 x 104 s 131 μs ms ns ps ns 12.6 ps ms S ms 155 ns ps 1.99 × 10-³ ms ns ps 8.66 x 10-³ µs |ns |ps ms

365 days = 1 year ; 24 hours = 1 day ; 60 sec = 1 min ;60 min = 1 hr How many minutes are in 2.31 hours?

1. In the olden days, US minted pennies were pure copper, but copper got so expensive that a pure copper penny was worth more than I cent. Modern pennies are composed of zinc and coated with copper. A student determines the mass of a penny to be 2.482 g. After making several scratches in a penny, the student puts the penny into hydrochloric acid, where the zinc (but not the copper) reacts with hydrochloric acid via a single replacement reaction. The hydrogen is collected at 25°C over water. The collected gas occupies 0.899 L at a total pressure of 791 mm Hg. A. Calculate the moles of hydrogen produced in the reaction. (Hint: Use the Table 1. to determine the vapor pressure of water and assume that all of the zinc in the penny dissolves.) B. Write a balanced chemical reaction for zinc and hydrochloric acid. C. Use stoichiometry to calculate the mass of zinc in the penny. D. Determine the percent zinc (by mass) in the penny.

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how do i set up the math

Multiply or divide the following measurements. Be sure each answer you enter contains the correct number of significant digits.

The books answer is Qc = SO2 but I don’t know how it got there

The speed of light is 2.998x10^8/ms . How long does it take light to travel 90.cm? Set the math up. But don't do any of it. Just leave your answer as a math expression. Also, be sure your answer includes all the correct unit symbols. time=

1 in = 2.54 cm, exactly 60 min = 1 hr, exactly 12 in = 1 ft, exactly 60 s = 1 min, exactly 4 qt = 1 gal, exactly 1 gal = 3.7854 L 1 BTU = 1055 J 1 lb = 453.6 g 1 mile = 1.609 km The U.S. quarter (25 cents) has a mass of 5.67 g and is about 1.55 mm thick. How many quarters are in a stack that is 1.75 ft high? Put your answer in the area provided, followed by "see upload." Conversion factors that you might find helpful are shown. Other conversion factors such as metric multipliers are not shown, as you are required to know them.

Every year Every second (1 year 365 days).