# 1083 of LethalDose
Concentrated hydrochloric acid is 38%, by mass, HCI in water. How
many grams of HCI are there in 25.0 g concentrated hydrochloric acid?
Select one:
O a. 38.0 g
O b.
25.0 g
O c. 16.5 g
O d. 12.0 g
O e. 9.50 g

Explanation:

When working with moles only, you will start by applying stoichiometry to determine how the reactants will affect your amount of products in this reaction. For this question, we will assume that other reactants are in infinite qualities, so therefore, it is the amount of aluminum that we will be concerned with. You need to figure out how much aluminum is in the specified amount of aluminum bromide, and then how much aluminum hydroxide that will be able to create. Make sure all your units cancel out!

9.24 mol AlBr3 x (1 mol Al / 1 mol AlBr3) x (1 mol Al(OH)3 / 1 mol Al) = 9.24 mol AlBr3

When you're working with mole ratios that involve grams to moles conversions, the first thing you want to do is calculate the molecular weight of each component you are being asked about. Because the question was given to you as words instead of chemical formulas, you will want to figure out the chemical formulas. For example, aluminum hydroxide is Al(OH)3 and aluminum bromide is AlBr3. To calculate molecular weight, you will want to consult a periodic table, find the molecular weight for each atom, and then calculate the correct sum of each molecular weight. Make sure you keep track of the number of each atom you have, i.e. 3 oxygen and 3 hydrogen for aluminum hydroxide.

Na = 22.990 g/mol

O = 15.999 g/mol

H = 1.008 g/mol

NaOH = 22.990 g/mol + 15.999 g/mol + 1.008 g/mol = 39.997 g/mol

Al = 26.982 g/mol

O = 15.999 g/mol

H = 1.008 g/mol

Al(OH)3 = 26.982 g/mol + (3 x 15.999 g/mol) + (3 x 1.008 g/mol) = 78.003 g/mol

Now, if you begin with an amount of NaOH in grams, you will first have to convert that to moles in order to use the mole ratio.

24 g NaOH x (1 mol NaOH / 39.997 g NaOH) = 0.600 mol NaOH

Now, you will have to account for the part of the sodium hydroxide that will be present in the aluminum hydroxide. In this case, it is the hydroxide (OH) portion of the formula. There is one mole of OH in each mole of NaOH, but there are 3 moles of OH in each mole of Al(OH)3. You will start with the 0.600 mol NaOH you know you have and then use the mole ratio.

0.600 mol NaOH x (1 mol OH / 1 mol NaOH) x (1 mol Al(OH)3 / 3 mol OH) = 0.200 mol Al(OH)3

Finally, when you are converting from grams to grams, you will have to find the molecular weight of both the reactant and the product, convert reactants in grams to reactants in moles, then use the mole ratio, then convert the moles of product back to grams of product. This time, you are concerned about the mole ratio of sodium, as that is the element that is in both chemical formulas.

Answer:

Veggie and proteins

Explanation:

At least based on US govt. recommendation we have to have more veggies and proteins and then fruits.

https://en.wikipedia.org/wiki/MyPlate

Answer:

C. fruits and vegetables

Explanation:

i got it correct on my test i hope you do too. have a good day

Answer:

14.61 g NaCl

Explanation:

Molarity = moles / volume of solution (litres)

0.500 = moles / 0.500 L

moles = 0.25

Molar mass of NaCl is 58.44 g NaCl /1 mol NaCl.

0.25 moles NaCl x 58.44 g NaCl /1 mol NaCl

= 14.61 g NaCl

Density is the ratio of mass and volume. The temperature in kelvin is 296 kelvin and the density of the block is 2.78 x 10⁻⁵ g/cm³. Thus, option D is correct.

Density is the gms of the substance present in a cubic centimeter of volume. It is calculated in g/ cm³.

Given,

Mass of the block = 150.0 mg

Volume = 5382 cm³

Density is calculated as:

D = Mass ÷ volume

= 0.15 gm ÷ 5382 cm³

= 2.78 × 10⁻⁵ gm/ cm³

Temperature from Celsius to kelvin is converted as:

0°C + 273.15 = 273.15K

22.5 + 273.15 = 295.65 Kelvin

Therefore, option D. 296⁰K; 2.78 x 10⁻⁵ g/cm³ is correct.

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Answer:

A rip current is least likely to affect Florida.

Explanation:

Since Florida is surrounded by bodies of water it would make sense for Tsunamis to occur frequently. Florida is also known to have drought problems and sometimes also wildfires. A rip current would probably affect Florida the least as it is also the least dangerous to society.

Answer:

tsunami

Explanation:

Answer: 2

Explanation:

Artificial transmutation occurs when nuclides are bombarded by particles like alpha particles or beta particles.

The solution is undersaturated and precipitation of solid calcium sulfate will not occur.

Ksp stands for solubility product constant. The solubility product constant, Ksp​, is the equilibrium constant for a solid substance dissolving in an aqueous solution.

From the given information, the solubility product constant of calcium sulfate is smaller than the concentration of its solution, thus, the solution is undersaturated and precipitation of solid calcium sulfate will not occur.

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The energy comes from the sun, captured through photosynthesis.

Answer:

Carbon And the number of protons

Answer:

It contains 6.02*10^23 molecules

Explanation:

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Answer:

A salt is a neutral ionic compound. Let's see how a neutralization reaction produces both water and a salt, using as an example the reaction between solutions of hydrochloric acid and sodium hydroxide. The overall equation for this reaction is: NaOH + HCI → H2O and NaCl.

Explanation:

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[tex]\\ \orange{MaggieEve}[/tex]

Answer:

4 covalent bonds

Explanation:

Each carbon atom can form as many as four covalent bonds with other carbon atoms as well as with other elements. Be able to explain why this is so. Be able to list the four main groups of organic molecules and their functions in living things.

The detection time when an industrial process wastewater contains a mixture of metal fragments and sand is 1392.8 seconds.

From the information regarding the industrial process wastewater, the settling velocity for the sand particles will be:

= 9.81/[18(1.002 × 10^-6] × (2.65 - 1) × (0.04 × 10^-³)²

= 0.001435

Therefore, the detection time will be:

t = 2/0.001435

t = 1392.8 seconds.

The detection time is 1392.8 seconds.

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The resin may be regenerated by washing it again with water and making it safe for use again.

Elution and regeneration are important processes in the treatment of water. The waste water is eluted through an ion exchange resin in which exchange of ions takes place.

The resin may be regenerated by washing it again with water and making it safe for use again.

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The number of moles in 72 gram H₂O is 3.942 MOL.

The mole is a SI unit of measurement that is used to calculate the quantity of any substance.

First, know the molar mass of water.

The given mass is 71 gram

[tex]\rm Number\;of \;moles= \dfrac{mass}{molar\;mass}\\\\\rm Number\;of \;moles= \dfrac{71}{18.01}= 3.942 mol[/tex]

Thus, the number of moles in 72 gram H₂O is 3.942 MOL.

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Answer: Compounds are composed of molecules bonded together.

The statement about compounds and molecules is correct is compounds are composed of molecules bonded together. Therefore, option C is correct.

The term compound is defined as a substance made from two or more different elements that have been chemically attached. Water, carbon dioxide and table salt are some examples of compounds.

A compound is form when two or more atoms form a chemical bond that links them together. As we know, there are two types of bonds are present that are ionic bonds and covalent bonds.

In an ionic bond, the atoms are linked together by the electrostatic forces of the attraction between ions of opposite charge. So,compounds are composed of molecules bonded together.

Thus, option C is correct.

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Answer:

Diamond.

Graphite.

Fullerene

Explanation:

these are three crystalline forms of carbon.

Answer:

Factories because they have helped with producing goods faster but in the meanwhile, our future will slowly get warmer.

Explanation:

Answer:

do u like fishing

Explanation:

because i do

Answer:

23.2 C

Explanation:

By looking at the dimension of specific heat ( J/g-C) , you can compute these type of questions:

 149.4 J  / ( .129 J / g-C   * 50 g) = 23.2 C  

           (see how dimensions g and J cancel out and you are left with C ? )

Answer: baited.

Explanation:

Apply combine gas law

So

[tex]\\ \rm\Rrightarrow \dfrac{P_1V_1}{T_1}=\dfrac{P_2V_2}{T_2}[/tex]

[tex]\\ \rm\Rrightarrow \dfrac{P1(0.722)}{296.3}=\dfrac{0.481(2.055)}{353}[/tex]

[tex]\\ \rm\Rrightarrow 0.0024P1=0.0028[/tex]

[tex]\\ \rm\Rrightarrow P_1=1.167atm[/tex]

D

Answer:

= 1.35M

Explanation:

data:

volume = 437ml

               = 437 /1000

                 = 0.437dm^3

no. of moles = 0.590 moles

solution:

        molarity = [tex]\frac{no. of moles}{volume in dm^3}[/tex]

                       = 0.590 / 0.437

        molarity = 1.35M

Answer: 504.3

Explanation: Add the respective weights of each of the elements in the compound together.

Answer:

815.59

Explanation:

Assuming no heat lost to the Surrounding

Total heat lost by granite = Total heat gained by water

mc∆T of granite = mc∆T of water

m x 0.79 x (54.1 - 29.2) = 467.62 x 4.184 x (29.2 - 21.0)

m x 19.671 = 16043.48106

m = 16043.48106/19.671

= 815.59J

Answer: sulphur dioxide

Explanation: