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ch4aika [34]
3 years ago
6

What is the average atomic mass of hafnium given the following abundance information on the isotopes?

Chemistry
1 answer:
Goryan [66]3 years ago
7 0

Answer:

178.55

Explanation:

176 × 0.05+ 177 × 0.19 + 178 × 0.27 + 179 × 0.14 + 180 × 0.35 = 178.55

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What is the name of this compound?<br> CH3CH2OCH2CH2CH3
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Based on the periodic table, which of the following elements has properties most like neon’s?
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Answer:

<h2>D. Krypton (Kr)</h2>

<u>Explanation:</u>

because

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Student carries out a titration to determine the concentration of a solution of
Nimfa-mama [501]

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<h3>Further explanation  </h3>

Titration is a procedure for determining the concentration of a solution (analyte) by reacting with another solution whose known concentration (usually a standard solution) is called the titrant. Determination of the endpoint/equivalence point of the reaction can use indicators according to the appropriate pH range  

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Reaction

HNO₃ + NaOH → NaNO₃ + H₂O​

Concentration a standard solution  of sodium hydroxide :  0.0998 mol/dm³ , and the volume = 25 cm³

moles NaOH=

\tt mol=M\times V\\\\mol=0.0998\times 25\\\\mol=2.495~mlmoles

<em>From the equation, mol ratio HNO₃ : NaOH = 1 : 1, so mol HNO₃ = mol NaOH=</em><em>2.495 mlmoles</em>

<em></em>

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\tt M=\dfrac{n}{V}\\\\M=\dfrac{2.495}{21.8}\\\\M=0.114

7 0
2 years ago
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