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jarptica [38.1K]
4 years ago
13

K2O+H2O=KOH What,if anything, should be done to balance this chemical equation?

Chemistry
1 answer:
VladimirAG [237]4 years ago
4 0
As is, the equation has:

Reactants:
2 K
2 O
2 H

Products:
1 K
1 O 
1 H

So, we can add coefficients to balance the equation:
K2O + H2O = 2KOH

The coefficient means that there are 2 moles of KOH, and now the equation is balanced as there is 2 of everything on both sides.


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What is the molarity of a solution that contains 0.220 moles KOH in 0.350 L of solution?
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Answer:

0.628 M.

Explanation:

In order to solve this problem we need to keep in mind the<em> definition of molarity</em>:

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We are given both the <em>number of moles and the volume of solution</em>, meaning we can now proceed to <u>calculate the molarity</u>:

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</span><span>How many mL of .225 M NaOH will react with 4.568g H3PO4? 

4.568 g (1 mol / 98 g) ( 3 mol NaOH / 1 mol H3PO4 ) ( 1 L / .225 mol NaOH ) = 0.621 L or 621 mL of .225 NaOH</span>
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