You have a stock bottle of HCl (aq) which is 12.1M, You need 400 mL of 0.10M HCl. How much of the acid and how much water will you need?

Answers

Answer 1

Answer: Mols of acid needed: 0.4 liters x 0.10 mol/liter = 0.04 mol

Volumen of acid in the bottle than contaiins 0.04 mol of acid: V = #moles/M = 0.04 mol/12.1 mol/liter = 0.003306 liters = 3.306 ml

Then you need 3.3 ml of acid from the bottle and 396.7 ml of pure water to get 400 ml of acid 0,1 M

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Elements are composed ofA) many type of atoms.

B) the same type of atom.

C) many different compounds.

D) the same type of compound.

Answers

The correct answer is B, 'the same type of atom'. By definition, an element is a single type of atom. They are the most basic forms of matter, and so they cannot be more than one kind of atom, and they also cannot be a compound, since compounds are made up of multiple atoms.

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OSHA standards appear in the ___________ and are then broken down into ____________.

Answers

OSHA standards appear in the Code of Federal Regulations (CFR) and was then broken down into two parts. It contains standards to ensure a comfortable and high quality research tools like the databases. These standards are to be strictly monitored to ensure the safety of workers.

The answer is

OSHA standards appear in the Code of Federal Regulations (CFR) and was then broken down into two parts.

The explanation:

OSHA standards are rules that describe the methods that employers must use to protect their employees from hazards. There are OSHA standards for Construction work, Maritime operations, and General Industry, which is the set that applies to most worksites. These standards limit the amount of hazardous chemicals workers can be exposed to, require the use of certain safe practices and equipment, and require employers to monitor hazards and keep records of workplace injuries and illnesses

It contains standards to ensure a comfortable and high quality research tools like the databases. These standards are to be strictly monitored to ensure the safety of workers.

Which is true about fossil fuels? A.
Coal came from ancient plants, while oil and natural gas came from marine organisms.

B.
Oil and coal came from dinosaurs, while natural came from marine organisms.

C.
Coal came from marine organisms, while oil and natural gas came from fish.

D.
Natural gas and oil came from ancient plants, while coal came from dinosaurs.

Answers

A. i just did this test

The correct answer would be D. Natural gas and oil came from ancient plants, while coal came from dinosaurs.

the formula C=5/9 (F - 32) can be used to convert a temperature from degrees Fahrenheit to degrees Celsius. which of the following is closest In value to 5/9?

Answers

F = $(9)/(5) c$ +32

Enter the temperature into the degrees Celsius (C) equal to 113∘ Fahrenheit (F). The formula F = 1.8°C + 32 allows you to find the Fahrenheit (F) temperature for a given Celsius (C) temperature.

Given: C = $\frac{5}9}$ (F - 32)

First, multiply both sides by $(9)/(5)$ to get:

$(9)/(5) c$ = F - 32

Add 32 to both sides and transpose to get:

F = $(9)/(5)c$ + 32

These are the formulas to translate between Fahrenheit and Celsius temperatures.

Fahrenheit and Celsius meet at −40 degrees.

That is −40∘ F = −40∘C

So alternative formulas for the conversions can be written:

F = $(9)/(5)$ (C + 40) − 40

C = $(5)/(9)$ (F +40) − 40

Learn more about Fahrenheit and Celsius here brainly.com/question/12897775

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F= 1.8C+32 or C= F-32/1.8

What is the ph at the equivalence point when 0.10 m hno3 is used to titrate a volume of solution containing 0.30 g of koh?

Answers

Answer;

pH = 7

Explanation;

HNO3 is a strong acid. KOH is a strong base. At the equivalence point, the solution will be neutral.
Therefore; the pH at the equivalence point when 0.10 m HNO3 is used to titrate a volume of solution containing 0.30 g of KOH will be 7.
The neutralization of a strong base with a strong acid gives a salt solution at the equivalence point. The salt contains ions that do not change the pH of water.

Answer:

pH at equivalence point will be 7

Explanation:

$HNO_(3)$ is a strong acid and KOH is a strong base. Hence a neutral salt would appear from acid-base reaction between them.
Acid-base reaction: $HNO_(3)+KOH\rightarrow KNO_(3)+H_(2)O$
At equivalence point, $KNO_(3)$ and water exists in medium.
As $KNO_(3)$ is a neutral salt therefore pH of medium will be equal to 7 (neutral).
So, pH at equivalence point will be 7.

Which of the following is a single replacement reaction?Fe2O3 + 3H2O yields 2Fe(OH)3FeS + 2HCl yields FeCl2 + H2S
2Mg + O2 yields 2MgO
Mg + 2HCl yields MgCl2 + H2