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A flash bulb used for taking photograph ...

A flash bulb used for taking photograph in poor light contains `30 mL` of `O_(2)` at `780 mm` pressure at `27^(@)C`. Suppose that metal wire flashed in the bulb is pure aluminium `(Al)` and it is oxidised to `Al_(2) O_(3)` in the process of flashing, calculate the minimun weight of `Al` wire that is to be used for maximum efficiency.

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To solve the problem, we will follow these steps: ### Step 1: Write the balanced chemical equation The reaction of aluminum with oxygen to form aluminum oxide is given by: \[ 4 \text{Al} + 3 \text{O}_2 \rightarrow 2 \text{Al}_2\text{O}_3 \] ### Step 2: Calculate the moles of \( O_2 \) We will use the ideal gas law to find the number of moles of \( O_2 \). The formula is: ...
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Despite the fact that aluminium is a reactive metal, it is a stable in air as well as in water. This is due to the formation of thin layer of oxide on the surface of aluminium metal which makes it passive for further attack. The layer is so useful, that in industry, it is purposely deposited by an electrolytic process called anodising. Reaction of aluminium with oxygen is highly exothermic and is called thermite reaction. 2Al_((s)) +(3)/(2) O_(2(g)) rarr Al_(2)O_(3(s)) Delta_(f) H^(Ө) = -1670 kJmol^-1 This reaction finds application for welding of metal and in the metallurgical extraction of many metals from their oxides. The limitation is that to start the reaction, high temperature is required for which an ignition mixture is required. Thermite mixture used for welding is

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