How many moles are in 43.5 g of sodium hydroxide (NaOH)?

Answer:

c! Hope this helps!

Explanation:

BRAINLIEST PLZ ;)

Answer:

I think its the third one im not sure tho

Explanation:

Answer:

either first or second if not them try d but I'm pretty sure a also I'm sorry if I getbyou this wrong I dearly apologize

Explanation:

Given parameters:

Mass of carbon dioxide  = 250g

Molar mass of carbon dioxide  = 44.01g/mol

Unknown:

Number of moles of carbon dioxide  = ?

Number of molecules of carbon dioxide  = ?

Solution:

We first find the number of moles of carbon dioxide;

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

  Number of moles  = [tex]\frac{250}{44.01}[/tex]   = 5.68moles

 From mole concept;

          1  mole of a substance contains 6.02 x 10²³ molecules

      5.68 mole of carbon dioxide will contain 5.68 x  6.02 x 10²³

                                                                = 3.42 x 10²⁴molecules

Answer:

it would need to lose energy

Explanation:

I don't really have an explanation

As the electrons gets closer to the nucleus, by the electrostatic force of attraction electrons are tightly bound to the nucleus. To move the inner electron to outer shell, high energy have to applied to weaken the nuclear force.

Nuclear force is the force by which the nucleon are bind in the nucleus and electrons are attracted towards the nucleus. The positively charged protons inside the nucleus electrostatically attracts the negatively charged electrons.

The minimum amount of energy required to remove an electron from the valence shell by overcoming the nuclear force is called ionization energy.

To bring an electron which is closer to the nucleus to the outer shell needs much energy to reduce the nuclear attractive pull. The energy need to gain.

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Answer:

a)6.730×10⁻⁴

b)5×10⁴

c)3.010×10⁻⁶

d)1.3240×10²

e)2.232×10³

The given numbers in scientific notation are [tex]6.730 \times 10^{-4}[/tex], [tex]5.0 \times 10^4[/tex], [tex]1.3240 \times 10^2[/tex],  [tex]2.232 \times 10^3[/tex] and  [tex]2.232 \times 10^3[/tex], respectively.

Scientific notation is a way of expressing very large or very small numbers in a compact and convenient form.

To express a number in scientific notation, we need to write the number in the form: [tex]\rm a\times 10^b[/tex]

a) 0.0006730 can be written in scientific notation as [tex]6.730 \times 10^{-4}[/tex]. The decimal point was moved 4 places to the right, so the exponent is negative 4.

b) 50000.0 can be written in scientific notation as [tex]5.0 \times 10^4[/tex]. The decimal point was moved 4 places to the left, so the exponent is positive 4.

c) 0.000003010 can be written in scientific notation as [tex]3.010 \times 10^{-6}[/tex]. The decimal point was moved 6 places to the right, so the exponent is negative 6.

d) 132.40 can be written in scientific notation as [tex]1.3240 \times 10^2[/tex]. The decimal point was moved 2 places to the left, so the exponent is positive 2.

e) 2232 can be written in scientific notation as [tex]2.232 \times 10^3[/tex]. The decimal point was moved 3 places to the left, so the exponent is positive 3.

Therefore, [tex]6.730 \times 10^{-4}[/tex], [tex]5.0 \times 10^4[/tex], [tex]1.3240 \times 10^2[/tex],  [tex]2.232 \times 10^3[/tex] and  [tex]2.232 \times 10^3[/tex], are the scientific notation for the given numbers.

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Answer:

84 pt =__50.4399___ qt

5.0 gal =___18.9271__ L​

Explanation:

Have A Wonderful Day!!

Answer: 84 pints = 42 quarts

5.9 gallons = 1.89271

Explanation:

Answer:

Cumulus clouds look like fluffy, white cotton balls in the sky. Since they are so thin, they seldom produce much rain or snow.

Cumulonimbus clouds are menacing looking multi-level clouds, extending high into the sky in towers or plumes. More commonly known as thunderclouds, cumulonimbus is the only cloud type that can produce hail, thunder and lightning.

Nacreous clouds are some of the rarest clouds on the planet. They are a form of polar stratospheric cloud, which is a main culprit in chemical destruction of the ozone layer.

Explanation:

Answer:

12

Explanation:

Answer:

Explanation

whats your question

Answer:

Pb(OH)2 + 2 HCl ---> 2H2o + PbCl2

Explanation:

Answer:

its the last one

Answer:

D

Explanation:

Answer:

the third one because oceans don't affect the weather  

Explanation:

Answer:

Percent composition is calculated from a molecular formula by dividing the mass of a single element in one mole of a compound by the mass of one mole of the entire compound. This value is presented as a percentage.

Explanation:

Answer:

Mass = 824.57 g

Explanation:

Given data:

Mass of bromine = ?

Number of moles of bromine = 5.16 mol

Solution:

Formula:

Mass = number of moles × molar mass

Molar mass of bromine = 159.8 g/mol

by putting values,

Mass = 5.16 mol × 159.8 g/mol

Mass = 824.57 g

Explanation:

The amount of rainfall would have the greatest impact on the amount of water available for people in this area. The more the rainfall the more water soaks through layers of porous rocks.Hence, level of water table will remain sufficient for easy pumping of water to the homes.Texas receives plenty of rainfall in a year.In a single year the region can receive up to 48 inches (1,200 mm) of precipitation, and flooding is common near rivers and in low-lying areas. Therefore water table remains intact throughout the year.

Answer:

This compound is HNO2

Explanation:

HNO2 ----> H+ + NO2

When metals and non metals combine in fixed proportion then a chemical compound is formed So, the compound that will be formed from  hydrogen ion and nitrate ion is Hydrogen nitrate.

Chemical formula is a formula where cation and anion combine to form a molecule in fixed proportion. Metals combine in form of cation and non metals combine in form of anion.

Cation is the species that give electron and attain positive charge while anion is a species which gain electron and attains negative charge so when anion and cation combine in fixed ration the the overall charge of the molecule is zero that is molecule is neutral, the charge over cation and anion is also called oxidation state.

Therefore, the compound that will be formed from hydrogen ion and nitrate ion is Hydrogen nitrate.

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Answer:

Star B

Explanation:

Star B, this is because, usually in the discussions about stars, the more luminous star or say, the brighter star usually is the one that possesses the smaller absolute brightness.

That being said, succinctly put, if we have two stars A and star B, if star A is brighter than star B, then star A has a lower absolute brightness. Also, if star B is less brighter than star A, then it has the higher absolute brightness.

Answer:

STAR B

Explanation:

Answer:

Lithium

Explanation:

Answer:

18.65004 grams H2O

Explanation:

First, we need to write down the balanced chemical equation for the decomposition reaction:

2LiOH -> H2O + Li2O

Since we have grams of LiOH and we need to know the grams of water, we need to convert to moles since we can only compare moles to moles.

The amu of LiOH is 23.947.

The given grams of LiOH is 63.. To convert to moles, we will divide 63 by 23.947..

This gives us 2.6310 moles LiOH..

To convert to moles of H2O (and later grams of H2O), we will use the mole fractions from the balanced equation...

When we look at the balanced equation we can see that 2 moles of LIOH can produce 1 mol of Water, so:

2.6310 moles [tex]* \frac{1 molH_{2}O}{2 mol LiOH}[/tex] = 1.3155 moles H2O

Now we will convert from moles to grams (we must multiply by the amu)

1.3155 moles H2O = 18.65 grams H2O

According to stoichiometry of the chemical equation of decomposition of lithium hydroxide 23.6 g of water are produced from the decomposition of 63 grams of lithium hydroxide.

Stoichiometry is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.

Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.It is useful in balancing chemical equations.

In the given example, as 47.9 g of lithium hydroxide produces 18 g water ,therefore 63 of lithium hydroxide will produce 63×18/47.9=23.6 g of water.

Thus, 23.6 g of water are produced from the decomposition of 63 grams of lithium hydroxide.

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Answer:

63.6%

Explanation:

The given compound is:

     N₂O;

The problem here is to find the percent composition of nitrogen in the compound.

First find the molar mass of the compound:

 Molar mass of N₂O = 2(14) + 16  = 44g/mol

So;

 Percentage composition of Nitrogen  = [tex]\frac{2 x 14}{44}[/tex]  x 100  = 63.6%

Answer:

A Infiltration

Explanation:

The downward movement of water through pore spaces and other spaces in soil due to gravity is called infiltration.

Infiltration is greatly due to the force of gravity forcing water through pore spaces downward.

Answer:

The object has to move a distance when a force is applied to it

Explanation:

For work to be done on a body the force applied must move the body through a particular distance.

  Work done  = Force x distance  

If no distance is moved by the force, no work is done.

Also, the angle between the force and the distance must be 0 to do the maximum work on the body.

Answer:

1. Na2SO4 + Ba(NO3)2 → NaNO3 + BaSO4

2. NaNO3 + NH4Cl → NaCl + NH4NO3

4. Sorry, I don't know

5. Refer to the attachment..

6. NaC2H3O2(aq) + AgNO3(aq) = NaNO3(aq) + AgC2H3O2

[tex] \huge{\blue{Thank \: you}}[/tex]

Answer:

D. The nucleus occupies very little of the volume but contains most of its mass

Explanation:

Density is an intensive property as it does not depend on the quantity of the substances Whereas mass and volume are extensive property. Therefore,  the nucleus occupies very little of the volume but contains most of its mass. The correct option is option D.

Density tells about the compactness of the substances, how much dense is the substances in other words. Object that is more denser than water they just sink in the water.

Mathematically,

Density = Mass of an atom's nucleus ÷volume marked on the graduated cylinder

Atoms contains nucleus in its center and electron that revolve around the atom in fixed orbit.  The nucleus occupies very little of the volume but contains most of its mass.

Therefore,  the nucleus occupies very little of the volume but contains most of its mass. The correct option is option D.

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Answer:

A,B,C

Explanation:

Answer:

D

Explanation:

You need both, independant and dependant variables for a hypothesis.