a$)$ We use a gas stove which burns natural gas at a rate of $0\mathrm{.}3mo\frac{l}{m}in$

with air. How much heat is produced $($in $k\frac{J}{m}in)?($Natural gas consists

of methane $(C{H}_4)$ only, combustion is complete, $T_{\text{a}\text{i}\text{r}}=T_{\text{n}\text{u}\text{t}\text{u}\text{a}\text{l}}=25C,$

$T_{\text{f}\text{l}\text{u}\text{e}\text{g}\text{a}\text{s}}=1000C)$

b$)$ We want to boil $($i$.$e$.$ increase the temperature of the water to

$\{$:$100C)2kg$ of water which is initially at $20C$ by using this stove.

How long does it take $($in seconds$)$ to boil the water? $($All of the heat

produced is transferred to the water in the cooker, there is no water