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3 years ago

Human genes can combine in about _________________ different combinations.

Chemistry

1 answer:

Law Incorporation [45]3 years ago

6 0

70,368,744,177,664
i hope that helps!

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12 + NaF --> Nal + F2 What is the coefficient of Nal when this equation is balanced? *

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3 years ago

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MrMuchimi

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3 years ago

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A 20.00 mL Ba(OH)_2 solution of unknown concentration was neutralized by the addition of 47.67 mL of a 0.1236 M HCl solution. Wr

dalvyx [7]

Answer:

- Balanced chemical reaction:

$2HCl(aq) + Ba(OH)_2(aq) \rightarrow BaCl_2(aq) + 2H_2O(l)$

- Concentration of the initial barium hydroxide solution:

$M_{Ba(OH)_2}=0.1473M$

- Concentrations of barium and chloride ions:

$M_{Ba^{2+}}=0.04353M\\M_{Cl^-}=0.08707M$

Explanation:

Hello,

In this case, the balanced chemical reaction with the proper physical states is:

$2HCl(aq) + Ba(OH)_2(aq) \rightarrow BaCl_2(aq) + 2H_2O(l)$

Moreover, it is convenient to perform the titration analysis in terms of normalities, therefore, HCl's normality becomes equal to its molarity as it is monoprotic (only one hydrogen in its formula), thus, we find barium hydroxide's normality:

$N_{Ba(OH)_2}=\frac{N_{HCl}V_{HCl}}{V_{Ba(OH)_2}}=\frac{0.1236N*47.67mL}{20.00mL}=0.2946N$

Hence, for the molarity, since two hydroxiles are in the barium hydroxide, 2 grams-equivalents are 1 mole, thus, its molarity is:

$M_{Ba(OH)_2}=0.2946\frac{eq-g}{L}*\frac{1mol}{2eq-g}=0.1473\frac{mol}{L}=0.1473M$

Then, after mixing and carry out the neutralization reaction the resulting volume is:

$V_{final}=20.00mL+47.67mL=67.67mL=0.067L$

In addition, the moles of both barium and chloride ions are:

$n_{Ba^{2+}}=0.02L*0.1473\frac{molBa(OH)_2}{L} *\frac{1molBa^{2+}}{1molBa(OH)_2} \\n_{Ba^{2+}}=2.946x10^{-3}mol Ba^{2+}\\\\n_{Cl^-}=0.04767L*0.1236\frac{molHCl}{L} *\frac{1molCl^-}{1molHCl} \\n_{Cl^-}=5.892x10^{-3}mol Cl^-$

Finally, the concentrations of such ions are:

$M_{Ba^{2+}}=\frac{2.946x10^{-3}molBa^{2+}}{0.06767L}= 0.04353M\\M_{Cl^-}=\frac{5.892x10^{-3}molCl^-}{0.06767L}= 0.08707M$

Best regards.

5 0

3 years ago

Read 2 more answers