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Chemistry

1 answer:

maxonik [38]3 years ago

4 0

The total number of moles of CO2 formed : 10

Further explanation

Given

Reaction

CaCO3(s) + 2HCl(aq) ⇒CaCl2(aq) + H2O( ) + CO2 (g)

20. moles of HCl

Required

moles of CO2

Solution

The reaction coefficient in the chemical reaction equation shows the mole ratio of the elements in the reactants and products

From the equation, mol ratio of HCl : CO2 = 2 : 1, so mol CO2 :

= 1/2 x mol HCl

= 1/2 x 20

= 10 moles

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4 0

3 years ago

Typical "hard" water contains about 2.0 x 10–3 mol of Ca2+ per liter. Calculate the maximum concentration of fluoride ion that c

malfutka [58]

Answer:

$[F^-]_{max}=4x10{-3}\frac{molF^-}{L}$

Explanation:

Hello,

In this case, for the described situation, we infer that calcium reacts with fluoride ions to yield insoluble calcium fluoride as shown below:

$Ca^{+2}(aq)+2F^-(aq)\rightleftharpoons CaF_2(s)$

Which is typically an equilibrium reaction, since calcium fluoride is able to come back to the ions. In such a way, since the maximum amount is computed via stoichiometry, we can see a 1:2 mole ratio between the ions, therefore, the required maximum amount of fluoride ions in the "hard" water (assuming no other ions) turns out:

$[F^-]_{max}=2.0x10^{-3}\frac{molCa^{2+}}{L}*\frac{2molF^-}{1molCa^{2+}} \\$