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3 years ago

Find the theoretical probability of randomly choosing a vowel from the alphabet. 5/25 5/26 4/25 4/26

Chemistry

1 answer:

cestrela7 [59]3 years ago

7 0

The answer should be 5/26 because there are 5 vowels out of 26 lethers in the alphabet.

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Morphine is a well known pain killer but is highly addictive. The lethal dose of morphine varies from person to person based on

Aliun [14]

Answer:

0.252 milimoles

Explanation:

To convert mass of a substance to moles it is necessary to use the molar mass of the substance.

The formula of morphine is C₁₇H₁₉NO₃, thus, its molar mass is:

C: 17*12.01g/mol = 204.17g/mol

H: 19*1.01g/mol = 19.19g/mol

N: 1*14g/mol = 14g/mol

O: 3*16g/mol = 48g/mol.

204.17 + 19.19 + 14 + 16 = <em>285.36g/mol</em>

Thus, moles of 71.891 mg = 0.071891g:

0.071891g × (1mol / 285.36g) = 2.5193x10⁻⁴ moles

As 1 mole = 1000 milimoles:

2.5193x10⁻⁴ moles = <em>0.252 milimoles</em>

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3 years ago

The water cycle imagine you are a rain drop

Soloha48 [4]

Evaporation,condensation,precipitation,sublimation,transpirtation,runoff and infiltration

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2 years ago

8. Neil pogo sticks from his locker to his science class. He travels 8 m east then 8 m west

jeyben [28]

Answer:

Explanation:

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3 years ago

A device which converts chemical energy into electric energy with brainliest

vampirchik [111]

battery

bro look it up first and do some searching and if you don't get a answer then ask it up here your just gonna waste your points

4 0

2 years ago

Ammonia is the most common and well-known weak base. A sample of household ammonia has a pH of 11.8. Determine its concentration

Galina-37 [17]

The given question is incomplete. The complete question is:

A sample of household ammonia has a pH of 11.50. What is the hydronium ion concentration of this solution?

Answer: The hydronium ion concentration of the solution is $1.58\times 10^{-12}M$

Explanation:

pH or pOH is the measure of acidity or alkalinity of a solution.

pH is calculated by taking negative logarithm of hydrogen ion concentration. Acids have pH ranging from 1 to 6.9 and bases have pH ranging from 7.1 to 14.

$NH_3+H_2O\rightarrow NH_4^++OH^-$

$pH=-\log [H^+]$

$11.8=-log [H^+]$

$[H^+]=antilog(-11.8)$

$[H^+]=1.58\times 10^{-12}M$

Thus hydronium ion concentration of this solution is $1.58\times 10^{-12}M$

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2 years ago

Read 2 more answers