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kotykmax [81]
3 years ago
15

What is the volume of an object with the mass of 7.9 grams in the density of 1.28g/ml.

Chemistry
1 answer:
ExtremeBDS [4]3 years ago
8 0

Answer: V = 6.17 mL

Explanation: Density is expressed in the formula:

d = m/V

Derive for V:

V= m/d

= 7.9 g / 1.28 g/ mL

= 6.17 mL

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n200080 [17]

Answer:

b) 3.10

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HF ⇄ H + + F

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pH = pKa + log [A-]/[HA].

Where;

pKa = Dissociation constant = -log Ka

Hence, pKa of HF = -log 7.2 x 10^-4 = 3.14266

[A-] = concentration of conjugate base after dissociation = moles of base/total volume

          = 0.15 x 0.3/0.8

               = 0.05625 M

[HA] = concentration of the acid = moles of acid/total volume

             = 0.10 x 0.5/0.8

                    = 0.0625 M

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pH = 3.14266 + log [0.05625/0.0625]

      = 3.14267 + (-0.04575749056)

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<em>a) 2.97 </em>

<em>b) 3.10 </em>

<em>c) 3.19 </em>

<em>d) 3.22 </em>

<em>e) 3.32</em>

The correct option is b.

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