Commonly Used Gases in the Laboratory Are Generally Obtained from Pressurized

question 6

Short Answer

Commonly used gases in the laboratory are generally obtained from pressurized metal gas cylinders, but for small amounts of occasionally used gases, it is sometimes easier just to prepare them chemically as needed.For example, nitrogen monoxide, NO(g), can be prepared in the lab by the following chemical reaction:
3Cu(s)+ 8HNO₃(aq) $\rarr$ 2NO(g)+ 3Cu(NO₃)₂(aq)+ 4H₂O(l)
If 5.0 g of copper metal was added to an aqueous solution containing 2.5 moles of HNO₃, how many moles of NO(g)would be produced, assuming a 100% yield.

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Definitions:

Moving Coil

A type of electromagnetic actuator where a coil within a magnetic field moves when current flows through it, commonly found in loudspeakers and galvanometers.

Ammeter Shunt

A device used to change the full scale value of an ammeter by providing another path for current flow. Most ammeter shunts produce a voltage drop of 50 millivolts when rated current flows through them.

Low-resistance

A characteristic of a material or component that allows a large amount of electrical current to pass through with minimal opposition.

Spike

A sudden, sharp increase or peak in the magnitude of a variable, often used in the context of electrical voltage or signals.