How many moles are in 9.40 grams Sodium nitrate?

Answer:

i would help i just dont know sorry

Explanation:

Answer:

True- Mirror causes van to appear closer

Explanation:

Objects in the rear view mirror appear closer than they really are.

Vision and area are limited by the mirrors.

Answer:

4.12 moles

Explanation:

We can solve this problem with the Ideal Gases Law.

P . V = n . R . T

In our first case we have:

P = 2.3 atm

V = 32.8 L

n = 2.98 moles

T → 35°C + 273 =  308K

Let's replace data for the second case:

2.3 atm . 45.3L = n . 0.082 . 308K

n = (2.3 atm . 45.3L) / (0.082 L.atm/mol.K . 308K)

n = 4.12 moles

Answer:

4.11 moles of H₂ are in a 45.3 L container under the same conditions.

Explanation:

Avogadro's law establishes the relationship between the amount of gas and its volume when the temperature and pressure are held constant.

This law says that the volume of a gas under conditions of constant temperature and pressure is directly proportional to the number of moles of gas. That is, if the amount of gas is increased, the volume will increase; whereas if the amount of gas is decreased, the volume decreases.

Avogadro's law is expressed mathematically as the quotient between the volume and the amount of gas equal to a constant:

[tex]\frac{V}{n} =k[/tex]

Being 1 the initial conditions and 2 the final conditions, the following is satisfied:

[tex]\frac{V1}{n1} =\frac{V2}{n2}[/tex]

In this case:

Replacing:

[tex]\frac{32.8 L}{2.98 moles} =\frac{45.3 L}{n2}[/tex]

Solving:

[tex]n2*\frac{32.8 L}{2.98 moles} =45.3 L[/tex]

[tex]n2=45.3 L*\frac{2.98 moles}{32.8 L}[/tex]

n2= 4.11 moles

4.11 moles of H₂ are in a 45.3 L container under the same conditions.

Answer:

always the same

Explanation:

e2020

Answer: Outer electrons because they revolve around the nucleus and can be multiple more than one

Explanation:

Hope it helps you you

Answer:

180 mmHg

Explanation:

Total volume of gases = 20% + 80%= 100%

Total pressure of gases = 900 mm Hg

Note that partial pressure of a gas = mole fraction × total pressure

Mole fraction of oxygen = 20/100

Hence partial pressure of oxygen= 20/100 × 900 mm Hg

partial pressure of oxygen= 180 mmHg

Answer:

A. The Coriolis Effect bends them

Explanation:

The Coriolis Effect is a force that causes objects and other things that are not attached to the ground and which are moving over a large distance around the Earth such as the trade winds or air planes, to take an apparent curved path in their motion rather than moving in a straight line, due mainly to the rotation of the Earth

The Coriolis Effect is named after French mathematical physicist Gaspard-Gustave de Coriolis

The rise in kinetic energy with temperatures allows the solvent molecules to break apart the solute molecules that are held by intermolecular attractions.

There are two direct elements that influence solubility are

Temperature stimulates the solubility of both solids and gases, but the pressure is only concerned with the solubility of gases.

Thus,  solids are dissolved in liquid water, the solubility increases with temperature.

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The atomic mass of elements could be predicted using Dmitri Mendeleev's periodic table.

The Periodic Table of elements is an arrangement of elements in groups and periods based on increasing atomic number.

The first periodic table of elements was designed by Mendeleev.

The arrangement was based on increasing atomic mass of elements.

Therefore, atomic mass of elements could be predicted using Dmitri Mendeleev's periodic table.

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Answer:

Explanation:

Mole measure the number of elementary entities of a given substance that are present in a given sample. 1 mole of ZnI[tex]_2[/tex] will result by the reaction of 1 mole of Zn with 1 mole of I[tex]_2[/tex].

The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number. The stoichiometry represents the number of moles.

The balanced equation is

[tex]Zn+ I_2\rightarrow ZnI2[/tex]

To see the mole of zinc iodide we need to have the knowledge of stoichiometry chemistry. So, the mole ratio among Zn, I[tex]_2[/tex] and [tex]ZnI_2[/tex] are 1:1:1 that means to produce 1 mole of ZnI[tex]_2[/tex], one of each Zn and I[tex]_2[/tex] are required.

Therefore 1 mole of ZnI[tex]_2[/tex] will result by the reaction of 1 mole of Zn with 1 mole of I[tex]_2[/tex].

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Answer:

ionic

Explanation:

because when in molten or dissolved in water  ions are free to move and carry  a charge however when in solid the ions are fixed in position so can't carry a charge.

Answer:

Indirect (B)

Explanation:

When one facter increases the other decreases.

Answer:

INDIRECT- when one factor increases, the other decreases

Answer:

This is an abbreviation for "parts per million" and it also can be expressed as milligrams per liter (mg/L). This measurement is the mass of a chemical or contaminate per unit volume of water. Seeing ppm or mg/L on a lab report means the same thing.

Answer:

6.2 days

Explanation:

initial activity = 40,000 cpm

one half-life = 20,000 cpm

two half-lives = 10,000 cpm

three half-lives= 5,000 cpm

four half-lives = 2500 cpm

24.8 days/4 half-lives = 6.2 days/ half-life

Answer:

pv=nrt solution re solve it

Answer:

scientists say the country has many home advantages for good research,but it desperately needs more government interest

Answer:

D. Element.

Explanation:

Atoms form elements. Elements form molecules. Molecules form compounds.

Answer:

it answer is (B)

the formula of toluene is C6H5CH3

it consists of a benzene ring with methyl group attached to it

Answer:

Because of the tilt of Earth on its axis, Earth's surface and atmosphere are unevenly heated by the Sun. Convection currents form in the atmosphere as warmer air rises and cooler air sinks.

Uneven hearing of earth cause convention currents to form because the Earth's surface and atmosphere are unevenly heated by the Sun

Answer:

C). Electrostatic attractions between + and - charged ions.

Explanation:

They're electrostatic attractions because it is electrovalent bonding.

The bond type in alumina Al₂O₃ is described by the option C. Strong strong electrostatic force between positive and negative ions make this ionic compound.

Alumina is one of the significant mineral of aluminum metal. Aluminum is 13th element in periodic table. Even though it is classified among the nonmetals Al shows metallic properties.

Al is an electropositive element with three valence electrons. Hence, it forms ionic compounds with highly electronegative elements such as oxygen.

Al easily reacts with oxygen to form the compound  Al₂O₃. Al donates its two electrons with an oxygen atom at the end and one electron to the intermediate oxygen. The same for the second Al atom. Hence Al acquires  +3 charge and O acquires -2 charge which binds them together.

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Answer:

See Explanation

Explanation:

We must remember that when a constraint such as a change in concentration, pressure or temperature is imposed on a reaction system in equilibrium, the equilibrium position will shift in such as way as to cancel the constraint.

If more of A or more of B is added to the system, the equilibrium position will shift towards the right and the solution becomes clear and colorless.

If C is added to the system, the equilibrium position will shift towards the left and the solution colour turns blue.

If A is removed from the system, the equilibrium position is shifted towards the left and the solution once again turns blue.

If C is removed from the system, the equilibrium shifts towards the right and the solution turns clear and colorless

srry the pic is not clear......

l cant see it.....

Answer:

a. 0.0250 moles MgCl2

b. i. 0.0500mol MgCl2 / dm3

ii. 3.54g Cl-/dm3

Explanation:

a. In 500cm3, the mass of MgCl2 (Molar mass: 95.211g/mol) is 2.38g. The moles are:

2.38g * (1mol / 95.211g) = 0.0250 moles MgCl2

b. The dm3 are (1000cm3 = 1dm3):

500cm3 * (1dm3 / 1000cm3) = 0.500dm3

Concentration is:

0.0250 moles MgCl2 / 0.500dm3

i. 0.0500mol MgCl2 / dm3

ii. Moles Cl-:

0.0250 moles MgCl2 * (2mol Cl- / 1mol MgCl2) = 0.0500 moles Cl-

Mass Cl- -Molar mass: 35.45g/mol-:

0.0500 moles Cl- * (35.45g / mol) = 1.77g of chloride ions

1.77g Cl- / 0.500dm3:

3.54g Cl-/dm3

Answer:

1.2353 mol

Explanation:

Answer:

The molarity of the solution is 1.1 [tex]\frac{moles}{liter}[/tex]

Explanation:

Molarity is a measure of the concentration of that substance that is defined as the number of moles of solute divided by the volume of the solution.

The molarity of a solution is calculated by dividing the moles of the solute by the volume of the solution:

[tex]molarity=\frac{number of moles of solute}{volume}[/tex]

Molarity is expressed in units [tex]\frac{moles}{liter}[/tex]

In this case

Replacing:

[tex]molarity=\frac{0.564 moles}{0.510 L}[/tex]

Solving:

molarity= 1.1 [tex]\frac{moles}{liter}[/tex]

The molarity of the solution is 1.1 [tex]\frac{moles}{liter}[/tex]

Answer:

Explanation:

Water is blue because water absorbs colors in the red part of the light spectrum. Like a filter, this leaves behind colors in the blue part of the light spectrum for us to see.