From the formula of methane it is clear that one mole of methane has 4hydrogen atoms. So, 37.6×1023 hydrogen atoms are there in 25.0 g of methane. Therefore, 9.4×1023methane molecules and 9.4×1023 hydrogen and 37.6×1023carbon atoms are there in 25.0 g of methane.
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Option A is correct. Over all reaction is as follow,
Fe₂O₃ (s) + 2 Al (s) → 2 Fe (s) + Al₂O₃ <span>(s)
</span>Explanation:
Here we are having two metals, Iron and Aluminium. Aluminium is very reactive than Iron and it is above Iron in the reactivity series.
This reaction has great importance in welding Iron on other metals, like welding Railway tracks. When Ferric Oxide is mixed with Aluminium metal and a spark is given, a vigorous exothermic reaction starts. The temperature reaches approximately 2000°C and Iron with melting point 1535 °C melts and is used for welding purpose. Such type of reaction is called as Thermite Reaction.
The last, because equilibrium is equal so it would have to be at an equal rate.
Answer:
Here is a picture of all the elements
Solution :
In the process to isolate gold that has a 80 percent yield, a 3.00 g of Au is being isolated.
That is, the actual yield of Au is 3. 00 g
Therefore, we need to find the theoretical yield.
As we know,
As actual yield = 3.00 g
percent yield = 80 %
So, theoretical yield = 
= 3.75 g
Thus he should be able to get 3.75 g which is the theoretical yield of Au.
