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In the following reaction, how many molecules of HCl are needed to produce four molecules of H2O?2HCI(aq) + Ca(OH)2(aq) --> CaC12(aq) + 2H2O(1)

User Childnick
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2 Answers

4 votes

Final answer:

To produce four molecules of H2O in the given reaction, four molecules of HCl are required, as it's a one-to-one reaction based on the balanced chemical equation.

Step-by-step explanation:

To determine how many molecules of HCl are needed to produce four molecules of H2O according to the reaction:

2HCl(aq) + Ca(OH)2(aq) → CaCl2(aq) + 2H2O(l) we look at the balanced chemical equation. This equation states that for every two molecules of H2O produced, two molecules of HCl are required. To produce four molecules of H2O, we simply double the amount of HCl needed.

Calculation:

2 molecules of HCl → 2 molecules of H2O
Therefore, 4 molecules of HCl → 4 molecules of H2O

User Zgood
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7 votes

Given the following reaction:


2HCl_((aq))+Ca(OH)_(2(aq))_{}_{}\rightarrow CaCl_(2(aq))+2H_2O_((l))

We want to know how many molecules of HCl will be needed to produce 4 molecules of H2O

We know that;

1 mole = 6.022x10^23 molecules

The mole ratio between HCl:H2O is 2:2, meaning we can use the stoichiometry, we know that the number of moles of HCl is the same for H2O.

If H2O has 4 molecules, lets first calcualate the number of moles.

1 mole = 6.022x10^23 molecules

x moles = 4 molecules

x = 4/6.022x10^23

x = 6.642x10^-24 moles of H2O

Since the molar ration of HCl:H2O is 2:2

Therefore the number of moles of HCl is 6.642x10^-24 moles

Now we can convert the number of moles to molecules.

number of molecules of HCl = 6.642x10^-24 x 6.022x10^23

= 4

There will be 4 HCl molecules needed.

User Chandmk
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