How many grams of magnesium are in sample containing 9.12+ 10 ^23atoms

Answer:

Force is measured in Newtons, which are units that equal 1 kg * m/sec 2. Force is measured in Newtons, N. Mass is measured in kilograms, kg. The unit that is used to measure force in the SI system of units is the Newton.

Answer is Newtons because I looked it up

Answer:

Autotrophs have the ability to synthesize their own food from the substances surrounding them. Examples of this are photosynthesis or chemical energy. Heterotrophs cannot synthesize their own food. They have to get their nutrition from other animals or plants.

In shorter terms, autotrophs are plants. Heterotrophs are humans.

Explanation:

Given :

An aqueous solution of 30g of salt in 80g of water.

To Find :

The % mass of the salt.

Solution :

Mass percentage of the salt is given by :

[tex]Mass \ \% = \dfrac{Mass \ of \ salt}{Mass \ of \ salt + Mass \ of \ water}\\\\Mass \ \% = \dfrac{30}{30 + 80 }\times 100 \%\\\\Mass \ \% = 27.27\ \%[/tex]

Hence, this is the required solution.

Answer:

D

Explanation:

^

Answer:

the answer is D

Explanation:

I hope this helped.

Answer:

The molecule is a branched hydrocarbon.

Explanation:

The methyl prefix indicate the presence of a single carbon or the molecule is a branched hydrocarbon.

The Prefix is used to show or indicate the substituents, side chains of the molecule and prefix attached to the beginning of a word and the molecules name is based on the number of carbon atoms in IUPAC nomenclature.  The International Union of Pure and Applied Chemistry (IUPAC).

For Example:

Number of carbon Atoms          Root Name                  Prefix (side group)

1                                                    meth-                             methyl-

2                                                   eth-                                ethyl-

3                                                   prop-                              propyl-

4                                                   but-                                 butyl-

5                                                   pent-                               pentyl-

6                                                   hex-                                 hexyl-

7                                                   hept-                                heptyl-

Thus, we can say that prefix tells us the number of carbon atoms in each molecule. A presence of single carbon is indicated by the methyl prefix or we can also say that the molecule is branched hydrocarbon.

Learn more about the IUPAC nomenclature here: https://brainly.com/question/16903179

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Answer:

n = 2.18 moles

Explanation:

Given that,

Mass = 127.5g

Molar mass of NaCl = 58.44 g/mol

We need to find the number of moles. We know that,

No. of moles = Given mass/molar mass

Put all the values,

[tex]n=\dfrac{127.5\ g}{58.44\ g/mol}\\\\n=2.18\ moles[/tex]

Hence, there are 2.18 moles of 127.5g of NaCl.

Answer:

380

Explanation:

I couldn't find the answer anywhere so this is the correct answer. I got it graded.

Answer:

In chemical bonds

Explanation:

A P E X

The energy in biomass is used to make electricity. The energy stored in

biomass in the form of chemical bonds.

Biomass was organic, which means it must be made up of material derived from living beings like plants as well as animals.

What is chemical bonds?

A chemical bond can be known as a long-term interaction involving atoms, ions, as well as molecules which allows chemical compounds to occur.

Biomass is made up of chemical energy that has been stored from the sun. Process called photosynthesis by which plants make biomass. Biomass can also be produced by burning for heat or processed into renewable liquid as well as gaseous fuels using a variety of techniques.

Therefore, the correct answer will be  option A.

To know more about chemical bonds and biomass.

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**Check for proof photos at the bottom.**

**Answers are in bold.**

__________________________________________________________

A student places three ice cubes in a beaker and allows them to partially melt. If she measures the temperature of the water in the beaker, what will she most likely observe? Explain your answer.

She will see that the temperature of the water is 0 degrees Celsius and it stays at that temperature until all the ice cubes completely melt.

__________________________________________________________

Use the table on the right to calculate each required quantity. Record values to 3 significant digits.

First answer: 35.8 kJ

Second answer: 871 g

Third answer: Fe

__________________________________________________________

An iron sphere with a mass of 75.00 g is heated to a temperature of 385.0°C. It is then placed in a beaker containing 150.0 g H2O at 100.0°C.

First answer: 339 kJ

Second answer: 9.02  kJ

Third answer: No

__________________________________________________________

A sample of water has a mass of 100.0 g. Calculate the amount of heat required to change the sample from ice at –45.00°C to water vapor at 175.0°C. Relevant constant values are given to the right.

First answer: 325  kJ

Second answer: boiling the water

__________________________________________________________

Identify the correct description for each part labeled on the diagram.  

A: ✔ heating solid

B: ✔ melting

C: ✔ heating liquid

D: ✔ boiling

E: ✔ heating gas

F: ✔ melting point

G: ✔ boiling point

Where are the particles closest together?

✔ A

When ice partially melts, the surrounding water remains at 0° Celsius. This is because ice melting only involves the water molecules overcoming intermolecular forces, or forces holding molecules together. The water molecules themselves aren't increasing in kinetic energy when turning into liquid. Since temperature measures kinetic energy, the temperature in this case, remains at 0°.

To find how much energy it takes to cause a phase change in a substance, you must find the number of moles, and determine whether to use ΔHvap and ΔHfus. ΔHvap is used to show how much energy is involved in evaporation and condensation, and ΔHfus is the same but used for melting and freezing. To find number of moles of a given substance, use the formula: mass of given substance divided by atomic mass. Both numbers have to use the same mass unit. Then, multiply number of moles by ΔHvap or ΔHfus to get kJ.

In a heating curve graph, the flat lines represent no change in energy, or the phase changes. The steep lines are change in energy, which are either heating or cooling. The bottom line is a heating/cooling solid. A heating/cooling solid is the coldest phase, which is why the line is at the bottom.

Here are photos of Edge to make things easier.

Answer:

C. An electron has a high probability of being in certain regions.

Explanation:

In the electron cloud model, there are no electron-orbits around the nucleus but a cloud. This cloud has various densities with respect to distance from the nucleus. The most dense region of the cloud (which is the region close to the nucleus) is where electrons has the highest probability of existence.

The model explains that an electron a greater chance of being in the region closer to the nucleus. Thus, an electron has a high probability of being in certain region of the cloud about the central nucleus. And an electrostatic force exists between the nucleus and the electrons.

Answer:

c

Explanation:

Answer:

2.18 grams of Br2 reacts to produce 3.25 grams of KBr

Explanation:

The balanced equation is

2 KI + Br2 → 2 KBr + I2

2 moles of KI and 1 mole of Br2 reacts to produce two molecules of KBr

Mass of two moles of KI = 2 * 166 grams

Mass of one mole of Br2 = 159.808 grams

Mass of two moles of KBr = 2* 119 grams

Thus,  159.808 grams of Br2 reacts to produce 2* 119 grams of KBr

2.18 grams of Br2 reacts to produce {(2* 119)/ 159.808} * 2.18 grams of KBr

2.18 grams of Br2 reacts to produce 3.25 grams of KBr

Answer:

0.188mol

Explanation:

Using the formula as follows:

mole = mass/molar mass

Molar mass of hypomanganous acid, H3MnO4 = 1(3) + 55 + 16(4)

= 3 + 55 + 64

= 122g/mol

Mass of H3MnO4 is given as 22.912 g

Hence;

moles = 22.912 ÷ 122

number of moles = 0.188mol

Zinc sulfide (or zinc sulphide) is an inorganic compound with the chemical formula of ZnS. This is the main form of zinc found in nature, where it mainly occurs as the mineral sphalerite.

Answer:

1.25 moles of magnesium chloride are produced

Explanation:

Based on the reaction:

Mg(s) + 2HCl (aq) → MgCl₂(s) + H₂(g)

1 mole of magnesium, Mg, reacts with 2 moles of hydrochloric acid, HCl, to produce 1 mole of magnesium chloride, MgCl₂ and 1 mole of hydrogen gas.

To solve this question we have to tak, from the chemical equation:

2 mol HCl = 1mol MgCl₂

That means, the moles of MgCl₂ produced from 2.50mol HCl are:

2.50 mol HCl * (1mol MgCl₂ / 2mol HCl) =

Answer:

[tex]1 \: ml = \frac{1}{1000} l \\ 7.65 \times {10}^{5} \: ml = \frac{7.65 \times {10}^{5} }{1000} \\ = 765 \: l[/tex]

Answer:

Tribhuvan University is a university in Tribhuvan, Nepal. Tribhuvan University (TU) is a pioneering higher education institution in Nepal, having been founded in 1959. ......

Pokhara University... Kathmandu University...

Purbanchal University is located in Purbanchal, India.

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Midwestern University is a public university in the Midwest...

Nepal Open University is a public university in Nepal.

Explanation:

Explanation:

moles= number of particle or atom / 6.02×10^23

so

[tex] \frac{1.1 \times {10}^{20 } }{6.02 \times {10}^{23} } [/tex]

gives u 1.83×10^-4 moles

hope it make sense :)

Answer:

1.7 * 10^-4 moles

Explanation:

According to Avogadro, one mole of a substance contains 6.02 * 10^23 number of atoms, molecules, ions etc.

Hence;

1 mole of Na contains 6.02 * 10^23 atoms

x moles of Na contains  1.0x10^20 atoms

x = 1.0x10^20 * 1/6.02 * 10^23

x = 1.7 * 10^-4 moles

Answer:

The answer is pentene.

Explanation:

The nomenclature for an organic compound with 5 carbon atoms will have a  -pent prefix.

An organic compound with at least one double bond will have alkene suffix, which is -ene.

Thus, the nomenclature for an organic compound that has 5 carbon atoms with at least one double bond will be pentene.  

Answer:

103.98 kpa

Explanation:

Pv= nRT

Where

P= pressure of the system=

n= number of moles= 3 moles

T= temperature= 250 K

Volume of the container= 60 liters

R= 0.0821L.atm/K.mol

Substitute the values

Pv= nRT

P= nRT/ V

= (3×0.0821×250)/60

= 1.026 Atm

1atm= 101325 Pascal

1.026 atm= X

= 103984 pasca

Convert to kilopascal

= 103984 pasca /1000

= 103.98 kpascal

Answer:

since an oxygen atom normally has 8 protons and 8 electrons, this ion has 10 electrons (-10 charge) and 8 protons (+8 charge) giving it a charge of -2 (-10 + 8 = -2).

Explanation:

Answer:

Explanation:

THE BEST ANSWER IS CCC

Answer: The one direction where energy as heat will be initially transferred between the blocks is from block D to block A.

Explanation:

A substance like metal box that has high temperature will have more kinetic energy between its molecules due to which there will be more number of collisions between them.

Hence, it is able to transfer its heat energy more  readily ac compared to a substance with low heat energy.

As a result, in the given diagram as temperature is increasing from block A to block B so heat energy will be transferred from block D to block A.

Thus, we can conclude that one direction where energy as heat will be initially transferred between the blocks is from block D to block A.

Answer:

A they share two covalent bonds

Answer:

NaHCO3(s) → NaOH(s) + CO2(g)

Explanation:

A balanced chemical equation is that in which the number of atoms of each element on the reactant side is equal to the number of atoms of each element on the product side.

Based on the following equation below, each atom on the reactant side matches the ones on the product side, hence, the equation is said to be balanced. The balanced equation is as follows:

NaHCO3(s) → NaOH(s) + CO2(g)

Answer:

D; the pollen sticks to the stigma

Explanation:

When a flower is pollinated, the pollen sticks to the stigma. However, it is not always pollinated by insects (birds and other factors can as well), pollen can be transferred from different flowers (as long as they're the same species) and pollination doesn't stick to the anther.

Answer:

d

Explanation:

because when pollution occurs than the insects move to the flower to sick nectar and then pollan giains stuck in the insect body

Answer:

Increased the concentration

Explanation:

Complete Question

Open the simulation by pushing the play button.  Begin by dragging the concentration tester overto the liquid and add drink mix until the concentration reaches approximately 2.oo mol/L.  This means there are 2.00 moles of the drink mix in 1 Liter of the solution. Add more drink mix until you notice a color change. Have you increased or decreased the concentration? (Higher number means a higher concentration).

Solution

Drink mix is basically the solute which is added to solvent i.e water.

The higher is the amount of drink mix in the solvent, the higher is the concentration of the solute and hence darker is the color of the drink.

Hence, in the case the concentration of the drink has been increased.

Answer:

Cinder cones

Explanation:

Answer:

najah zggs haihß hajoa ha8 a an àjàhajß

An investigation is conducted into how the mass of magnesium metal reacting with hydrochloric acid affects the amount of hydrogen gas produced.

Masses of 0.10g, 0.20g, 0.30g and 0.40g of powdered Mg metal are reacted with hydrochloric acid(HCl). The conical flask containing the reaction mixture of Mg and HCl is connected to another conical flask with a hose. The hydrogen gas produced by the reaction is collected in this conical flask. The greater the amount of hydrogen gas produced by the reaction the greater the pressure of the gas in the flask.

Answer:

A) what is the independent variable:

B) what is the dependent variable:

C) write a hypothesis for this investigation:

D) give 2 variables that should have been controlled for this investigation: