4 years ago

The formula for sodium sulfide is na2s what does it mean

1 answer:

8 0

<span>This is an ionic compound. It contains two atoms of sodium for every one atom of sulfer. this was just what i have learned so far.</span>

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IceJOKER [234]

The answer is A John Roebling.

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4 years ago

Semenov [28]

Answer:

the answer to this question is 288

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3 years ago

MakcuM [25]

Answer: 86.47 g of carbon-14 must have been present in the sample 11,430 years ago.

Explanation:

Half-life of sample of carbon -14= 5,730 days

$\lambda=\frac{0.693}{t_{\frac{1}{2}}}=\frac{0.693}{5,730 days}=0.00012 day^{-1}$

Let the sample present 11,430 years(t) ago = $N_o$

Sample left till today ,N= 0.060 g

$N=N_o\times e^{-\lambda t}$

$ln[N]=ln[N]_o-\lambda t$

$\log[0.060 g]=\log[N_o]-2.303\times 0.00012 day^{-1}\times 11,430 days$

$\log[N_o]=1.9369$

$N_o=86.47 g$

86.47 g of carbon-14 must have been present in the sample 11,430 years ago.

5 0

4 years ago

geniusboy [140]

I would say the same thing as the first answer

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4 years ago

mr Goodwill [35]

C. It is C because it really is loose covering.

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3 years ago