show how to work out...Calculate the mass in grams of 3.50 x 1025 atoms of lithium. Answer: 404g Li​

Answer:

XZ2

Explanation:

There are different ways in which compounds can be represented. Broadly, we have three different types of formula;

- Structural formular: This shows how th atoms in te compound are connected to each other.

- Molecular formular: This shows the actual number of atoms of element present in the compound

- Empirical Formular: This is the simplest formular of a compound. It basically shows the number of atoms in simple ration to each other.

This question requires us to input the empirical formular;

X2Z4

The ratio of the elements is; 2 : 4 which can be simplified into 1 : 2

This means the empirical formular is XZ2

Answer:

C) Both have equal numbers of moles.

Explanation:

The number of moles would be the same under the same pressure, volume and temperature.

"If A 5.0 L chamber contains equal pressures of H₂ and N₂ at 25 °C then both gases would have equal number of molecules according to Ideal Gas Law."

Both contain equal number of molecules.

According to Avogadro's Law, 1 mole of every substance occupies 22.4 L at STP.

Thus, equal volume of all gases contain same number of molecules at same temperature and pressure.

[tex]PV=nRT[/tex]

where, P = pressure

V = volume

n = moles

R = gas constant, and

T = Temperature

As volume , pressure and temperature are equal for both [tex]H_2[/tex] and [tex]N_2[/tex] gases, therefore both gases contains equal moles and hence equal number of molecules.

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Answer:

the heat from the sun makes the water molecules move faster and faster, until they move so fast they escape as a gas.

Explanation:

please tell me if I'm wrong

Answer:

3.84 kg

Explanation:

CCl4 molar mass: 153.82 g/mol

n = mass / molar mass

25 moles = mass / 153.82 g/mol

mass = 25 x 153.82

mass = 3845 g or 3,84 kg

Answer:

electrons fill lower energy levels first before occupying higher energy levels.

Explanation:

The Aufbau's principle describes that electrons fill lower energy levels first before occupying higher energy levels.

In writing the electronic configuration of atoms, the Aufbau's principle is one of the most important principles to consider.

It states that "sublevels with with lower energies are filled up before those with higher energies".

Sublevels do not fill up in numerical order.

Answer:

Option C (two isotopes of an element)

Explanation:

An isotope is two or more forms of the same element that contain equal numbers of protons (as well as electrons) but different numbers of neutrons in their nuclei, and hence differ in relative atomic mass but not in chemical properties. For example :-

Isotopes of carbon ⇒

In the question , both the atoms have same number of protons , but their number of neutrons isn't same. Hence , they are the isotopes of an element.

Answer:

okyay

Explanation:

lol

Answer:

12345678

Explanation:

i don't know so yea

Answer:

5.36 × 10²³ molecules

Explanation:

Given data:

Number of moles of silver = 0.89 mol

Number of molecules = ?

Solution:

Avogadro number:

The number 6.022 × 10²³ is called Avogadro number.  

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.  

For example,

18 g of water = 1 mole = 6.022 × 10²³ molecules of water

1.008 g of hydrogen = 1 mole = 6.022 × 10²³ atoms of hydrogen

Number of molecules of silver:

1 mole contain 6.022 × 10²³ molecules

0.89 mol  ×  6.022 × 10²³ molecules /1 mol

5.36 × 10²³ molecules

Answer:

C. It helps a plant conserve energy.

Explanation:

Dormancy is a time in a plants life that it stops all physical growth, therefore conserving energy.

Hope this helps.

Answer:

true

Explanation:

It has been an expense for the Australian government (taxpayers) to try to control the rabbit population. This statement is true.

Aside from the lack of natural predators on the continent, their success is aided by rapid reproduction: They can have more than four litters a year, each with up to five kits (baby rabbits).

The European wild rabbit has become an invasive pest in the southern two-thirds of Australia. They have an impact on natural environments, primary production, as well as townships and infrastructure.

The government turned to biocontrol in the 1950s. They released rabbits infected with myxoma, a virus that only affects rabbits, into southeastern Australia.

Thus, It has been an expense for the Australian government (taxpayers) to try to control the rabbit population. This statement is true.

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Answer:

two north poles and two south poles

Explanation:

A single magnet has a north pole and a south pole. If it is broken into two pieces, then each of the two pieces will have a north pole and a south pole.

No matter how many times or into how many pieces a magnet is broken, the resulting pieces will have two poles each.

Answer:

Each piece will still have a north pole and a south pole.

Explanation:

Answer:

c is not a true statement

Answer: it’s

Earth gravity keeps all the planets spinning around the sun.

Explanation:

Got it right

Answer:

Natural resource professional

Explanation:

The job title that describes a person with a career in green energy is a hydroelectric technician. The correct option is c.

Green energy is renewable energy and these energies are produced by renewable resources. Renewable resources are the resources that will not be reduced, and these natural resources are present, and these energies can reproduce again by these resources.

The hydroelectric technician is the person who checks the technical problems of a hydroelectric power plant. Hydroelectricity is produced by water.

This is a renewable resource, and it does not produce any kind of pollution, So a hydroelectric technician will be a job title that describes a person with a career in green energy.

Therefore, the correct option is c., hydroelectric technician.

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The question is incomplete. Your most probably complete question is given below:

Elevator installer

sewing machine operator

hydroelectric technician

animal trainer

Answer:

A)27.6g H2O x (1 mole H2O/ 18.02g H2O) x (1 mole H2/ 2mole H2O)

= 0.766 mol H2 x 6.022 x 10^23

= 4.61 x10^23 molecules

B)12.9g H2O x (1 mole H2O/ 18.02g H2O) x (2 mole Na / 2mole H2O)

=0.716 mol Na x 6.022x 10^23

= 4.31 x 10^23 atoms

Explanation:

I hope it's help

answer: D

Here is a list of the most common ways to speed up a chemical reaction

Increase the temperature (reactions that absorb energy)

Decrease the temperature (Reactions that release energy)

Answer:

European stability mechanism

Answer: C

Na + O2 →Na2O

Explanation:

A

MgCO3→MgO + CO2 balanced

B

NaCl + KI →NaI + KCl balanced

C

Na + O2 →Na2O not balanced the balanced would be 4Na + O2 →2Na2O

D

Ca + MgSO4→CaSO4+ Mg balanced

Answer:

You get some type of pressure that you start to feel in your muscles and joints from gravity and movement. How do they say it? Something called "seat-of-the-pants" (something like that). You get some type of pressure, and your body senses it, and it knows when you are upside-down or not, because if you're not, then you won't get any pressure in your muscle.

Hope this helped!

Have a supercalifragilisticexpialidocious day!

Answer:

He it would because 250g is the answer is to 256g

Explanation:

Answer:

ionic

Explanation:

In this instance, fluorine is a non-metal while magnesium is a metal. Ionic bonds are always formed when a metal and a non-metal are combined. Therefore, magnesium fluoride is an ionic compound, and an ionic compound's inter-ion force is always an electrostatic force.

The molecule's ionic bond is exceedingly powerful. When a molecule dissolves in water, it releases a significant amount of ions into the mixture. For the same reason, it conducts electricity as well. This explains why magnesium fluoride is naturally polar.

One type of binary ionic compound is magnesium fluoride. It consists of one magnesium atom and two fluorine atoms. In comparison to fluorine, magnesium is a metal with a substantially lower electronegativity.

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Explanation:

Transition metals occupy the d block of the periodic table. Their location is right between the group 2A and 3A. Copper (Cu) is in the first row of the d-block elements. The image attached illustrates the position of the transition metals relative to other elements in the periodic table.

Answer:

They will have the same ear shape since their proteins connect in the same ways to determine ear shape.

Explanation:

I majored in Chemistry

Answer:

They will have the same ear shape since their proteins connect in the same ways to determine ear shape.

Explanation:

Answer:

it is in liquid state.

it shapes as the object is .

it can change into gas state by heating .

it has on colour.

Answer:

7 atoms

Explanation:

Answer:

643.21g  1 mol  6.022^23

262.87 g   1 mol

= 1.4735E24     [Mg3(PO4)2]

Answer:

3.63 x 10²³molecules

Explanation:

Given parameters:

Mass of methane = 9.65g

Unknown:

Number of molecules  = ?

Solution:

To solve this problem first, we find the number of moles of the given compound or molecule first.

The given molecule is methane;

    CH₄;

     Number of moles  = [tex]\frac{mass}{molar mass}[/tex]

Molar mass of CH₄   = 12 + 4(1)  = 16g/mol

    Number of moles  = [tex]\frac{9.65}{16}[/tex]   = 0.603moles

So;

From mole concept;

      1 mole of a substance contains 6.02 x 10²³ molecules

    0.603moles of methane will contain 0.603  x  6.02 x 10²³

                                                               = 3.63 x 10²³molecules