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Eddi Din [679]
3 years ago
6

Help Please!! Idk how to do this

Chemistry
1 answer:
Rainbow [258]3 years ago
5 0

i think the answer is c, omg i may be wrong tho

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So the relative mass of fluorine in the second compound is one-third that of sf6. what formula expresses one-third the amount of
stealth61 [152]

The formula SF_2 expresses one-third the amount of F.

The F:S ratio in the first compound is 6:1.

We want a compound with one third the amount of F, so F:S = 2:1.

The simplest formula with this ratio is SF_2.

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4 years ago
The final volume of buffer solution must be 100.00 mL and the final concentration of the weak acid must be 0.100 M. Based on thi
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Answer:

0.387 g

Explanation:

pH of the buffer = 1

V = Volume of solution = 100 mL

[HA] = Molarity of HA = 0.1 M

K_a = Acid dissociation constant = 1.2\times 10^{-2}

(assuming base as Na_2SO_410H_2O)

Molar mass of base = 322.2 g/mol

pKa is given by

pK_a=-\log K_a\\\Rightarrow pKa=-\log(1.2\times 10^{-2})\\\Rightarrow pK_a=1.92

From the Henderson-Hasselbalch equation we get

pH=pK_a+\log\dfrac{[A^-]}{[HA]}\\\Rightarrow pH-pK_a=\log\dfrac{[A^-]}{[HA]}\\\Rightarrow 10^{pH-pK_a}=\dfrac{[A^-]}{[HA]}\\\Rightarrow [A^-]=10^{pH-pK_a}[HA]\\\Rightarrow [A^-]=10^{1-1.92}\times0.1\\\Rightarrow [A^-]=0.01202\ \text{M}

Moles of base

0.01202\times100\times\dfrac{1}{10^3}=0.001202\ \text{moles}

Mass of base is given by

0.001202\times 322.2=0.387\ \text{g}

The required mass of the base is 0.387 g.

5 0
3 years ago
Why does silicon have a high melting point
Igoryamba
If the bonds are held together tightly, as an ionic bond or even a covalent bond, there will need to be a strong force to separate those bonds. This would by why their would be a high melting point. Another reason would be re-activity. <span />
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wheres the diagram ?

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