A hospital supply room is out of saline drip bags. A nurse is asked by a doctor to make 1 L of a 0.05 M saline solution for a patient's emergency IV drip. In the stock room she finds a 1.0 M saline solution. If the nurse wishes to make the 0.05 M solution and save the extra as emergency stock, how much saline solution will she need to measure out in a graduated cylinder to dilute the 1.0 M solution to 0.05 M by adding distilled water​

Acamcorder has a power rating of 17 watts. if the output voltage from its battery is 7 volts, what current does it use?units:

How many liters of oxygen gas, at standard temperature and pressure, will react with 35.8 grams of iron metal? 4 fe (s) + 3 o₂ (g) → 2 fe₂o₃ (s)

Modern pennies are composed of zinc coated with copper. a student determines the mass of a penny to be 2.482 g and then makes several scratches in the copper coaling (to expose the underlying zinc). the student puts the scratched penny in hydrochloric acid, where the following reaction occurs between the zinc and the hcl (the copper remains undissolved): zn(s) + 2 hcl(aq) → h2(g) + zncl(aq)the student collects the hydrogen produced over water at 25 °c. the collected gas occupies a volume of 0.899 l at a total pressure of 79 j mmhg. calculate the percent zinc (by mass) in the penny. (assume that all the zn in the penny dissolves.)