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4 years ago

Write these numbers rounded to the three nearest significant figures

Chemistry

1 answer:

Savatey [412]4 years ago

7 0

Answer:

(a) 52.2 mL helium

(b) 18.0 g nitrogen

(d) 23,600,000 mm wavelength

(e) 0.00420 kg lead

Rounded the numbers to three nearest significant figures.

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The total volume required to reach the endpoint of a titration required more than the 50 mL total volume of the buret. An initia

Sonja [21]

Answer:

The answer is " $\bold{50.42 \pm 0.08}$ ".

Explanation:

Overall delivered volume $= [(49.06 \pm 0.05) + (1.77 \pm 0.05)]\ mL$

Its blank solution without any of the required analysis $= (0.41 \pm 0.04)\ mL$

Compute the volume of the endpoint as follows:

Formula:

$\text{End point volume = Total Volume delivered - volume required}$

$= (49.06 \pm 0.05) + (1.77 \pm 0.05) - (0.41 \pm 0.04) \\\\= (49.06 + 1.77 - 0.41) \pm \ \ (absolute \ \ uncertainty)$

therefore,

absolute uncertainty $=\sqrt{(0.05)^2 + (0.05)^2 + (0.04)^2}$

$=\sqrt{0.0025 +0.0025 +0.0016} \\ \\=\sqrt{0.0066}\\\\=0.08124\\$

The Endpoint volume $= (49.06+1.77-0.41)\pm (0.08124)$

$= 50.42 \pm 0.08$

Therefore, the volume of the endpoint adjusted for the blank is:

$\bold { = 50.42 \pm 0.08}$

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4 years ago

Which type of polymer is RNA?

Alex787 [66]

a nucleic acid
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4 years ago

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Calculate the pH when 64.0 mL of 0.150 M KOH is mixed with 20.0 mL of 0.300 M HBrO (Ka = 2.5 × 10⁻⁹)

KonstantinChe [14]

Answer:

The answer is "12.06"

Explanation:

Given:

$M(HBrO) = 0.3\ M\\\\V(HBrO) = 20 \ mL\\\\M(KOH) = 0.15 \ M\\\\V(KOH) = 64 \ mL$