<span>2 H</span>₂<span> + O</span>₂<span> = 2 H</span>₂<span>O
4 g H</span>₂ ------------ 32 g O₂----------- 36 g H₂O
<span> 8 g H</span>₂ ------------ 64 g O₂------------ ? g H₂O
<span>
Mass of H</span>₂O :
<span>
64 * 36 / 32 =
2304 / 32 = 72 g of H</span>₂O
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hope this helps!
</span>
Answer:
Explanation:
A catalyst is a <em>substance that increases the rate of a reaction by lowering the activation energy</em>. It does so by providing an alternative reaction pathway. The catalyst may react to form an intermediate with the reactant, but it is regenerated in a subsequent step so it is not consumed in the reaction. A catalyst speeds up a reaction by providing a set of elementary steps with more favorable kinetics than those that exist in its absence.
For light travelling in vacuums, ALWAYS use this equation:
c = (wavelength) * (frequency)
c is a constant, speed of light = 3 x 10^8 m/s
make sure all units are consistent!
so frequency = c / (wavelength) = ( 3 x 10^8 m/s ) / (4.257 x 10^ -9 m )
plug it into your calculator and you're done!
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