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3 years ago

Which of the following is the correct scientific notation for 0.00000862?

Chemistry

2 answers:

Sonja [21]3 years ago

6 0

8.62 *10^6 is the answer

Molodets [167]3 years ago

3 0

862^-10 my friend this is the answer

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An 8.89 g sample of an aqueous solution of nitric acid contains an unknown amount of the acid. If 27.1 mL of 0.581 M potassium h

worty [1.4K]

Answer:

The percent by mass of nitric acid in the mixture is 11.1 %

Explanation:

Step 1: Data given

Mass of HNO3 = 8.89 grams

Volume of KOH = 27.1 mL = 0. 0271 L

Molarity of KOH = 0.581 M

Step 2: The balanced equation

HNO 3 + KOH → KNO 3 + H 2 O

Step 3: Calculate the moles of KOH

Moles of KOH = molarity KOH * volume

Moles KOH = 0.581 M * 0.0271 L

Moles KOH = 0.0157 moles

Step 4: Calculate moles of HNO3

For 1 mol of KOH we need 1 mol of HNO3

For 0.0157 moles of KOH we need 0.0157 moles of HNO3

Step 5: Calculate mass of HNO3

Mass KOH = moles KOH * molar mass KOH

Mass KOH = 0.0157 moles * 63.01 g/mol

Mass KOH = 0.989 grams

Step 6: Calculate mass % HNO3 in sample

mass % = (0.989 grams / 8.89 grams)*100%

mass % = 11.1 %

The percent by mass of nitric acid in the mixture is 11.1 %

3 0

4 years ago

Which of the following is an acid-base indicator? A) hydrochloric acid B)sodium hydroxide C)water D)phenolphthalein

KATRIN_1 [288]

D the answer is phenolphthalein

4 0

4 years ago

Read 2 more answers

The molar absorptivity of Beta-carotene at 490 nm is 1.36 x 105 M-1cm-1. What is the concentration of a solution of Beta-caroten

finlep [7]

Answer:

The correct answer to the following question will be Option E (1.0 x 10⁻³ M).

Explanation:

The given values are:

$A\lambda =140$

$\varepsilon=1.36\times 10^5 \ M \ {cm^{-1}}$

L = 1 \ cm

As we know,

⇒ $A\lambda=\varepsilon CL$

On putting the given values in the above formula, we get

⇒ $140=1.36\times 10^5\times C\times 1$

⇒ $C=\frac{140}{1.36\times 10^5}$

⇒ $C=102.9\times 10^{-5} \ M$

So that option E is the right answer.

3 0

3 years ago

Who was the first to state the concept of an atom

marin [14]

Democritus, a Greek philosopher, first developed the idea of atoms (around 460 B.C., I believe).
Hope this helps!

6 0

4 years ago

identify the reagents necessary to achieve each of the following transformations o3 dms, pcc, ch2cl, h2so4,h2o,hgso4

hoa [83]

the reagents necessary to convert alcohol to ketone $Na_2Cr_2O_7 , H_2O$ which involves oxidation of alcohols.

<h3>What is oxidation of alcohols?</h3>

Alcohol oxidation is a significant organic chemistry process. Secondary alcohols can be oxidized to produce ketones, while primary alcohols can be oxidized to produce aldehydes and carboxylic acids.
In contrast, tertiary alcohols cannot be oxidized without the C-C bonds in the molecule being broken.
In order to cause primary alcohols to oxidize into aldehydes