How many moles are in 843 grams of MgCl2

Answer:

The concentration of Mg3P2 solution = 0.24mol/L

Explanation:

Mass = 81.1g

Volume = 2.5L

Concentration (C) of a solution = [tex]\frac{Moles (n)}{Volume (V)}[/tex]

but moles = [tex]\frac{mass}{Molar mass}[/tex]       and      Molar mass of Mg3P2 = 134.88g/mol

Moles = [tex]\frac{81.1g}{134.88g/mol}[/tex]

          = 0.60mol

hence the concentration can be calculated by;

C =  [tex]\frac{0.60mol}{2.5L} \\[/tex]

  = 0.24mol/L or 0.24M

Answer:

158 mL

158 mL of 0.1 M of HCl is required to react completely with 1 g mixture of Na2CO3 and NaHCO3, containing equimolar amounts of both

Explanation:

hope helpez -,-~

btw masoom bachi copied me~

The answer is 0.46 ml of the original H₂S0₄ and dilute to a final volume of 100 ml.

Normality is a measure of concentration equal to the gram equivalent weight per liter of solution.

Normality = Number of gram equivalents × [volume of solution in litres]⁻¹

Preparing 100. ml of 0.1 N H₂S0₄

Eq. wt. of H₂S0₄ = 98/2=49

density of H₂S0₄= 1.08

Purity =98%

1 N H₂S0₄ = 49 gH₂S0₄ / liter

1  gm equiv wt /L x 1 gm equiv. wt / 2 = 98 / 2 = 49 g)

0.1 N H2SO4 = 4.9 g / L

To make 100 ml (0.100 L) we would need 4.9 [tex]\rm \frac{g}{L}[/tex] x 0.1 L

= 0.49 g H₂S0₄/100ml

Original density = 1.08 g / ml

with a purity of 98%,

this converts to 1.08 g x 0.98 = 1.058 g /ml

0.49 g H₂S0₄ x 1 ml / 1.058 g = 0.46 ml of original H₂S0₄needed

Therefore to make the desired solution

Take 0.46 ml of the original H₂S0₄ and dilute to a final volume of 100 ml.

To know more about Normality

https://brainly.com/question/9754178

#SPJ1

Answer:

30 moles

Explanation:

From the equation it is a one - to - one reaction

Avogadro's number is the number of the particles in a mole of a substance. There are 339 grams of (Rb) rubidium in the sample.

Atoms are the fundamental of the matter that is unsplittable into fine particles.

We know, that 1 mole = 6.022 x 10²³ atoms

So, moles in 2.39 x 10²⁴ atoms will be calculated and converted into mass by using the molar mass of the substance.

2.39 x 10²⁴ × (1 ÷  6.022 x 10²³) × 85.468 =  339 g Rb

Therefore, 339 g Rb is present in the sample.

Learn more about moles and atoms here:

https://brainly.com/question/6683218

#SPJ1

it is D. Air pressure!!! :)

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.

The change in temperature of 150 grams of water when gains 500 Joules of energy is 0.797 °C

Heat transfer is defined as the process in which the molecules are moved from the region of higher temperature to lower temperature.

The heat transfer can be calculated by the formula

[tex]Q=m \times c \times \Delta T[/tex]

Here, Q is the heat supplied to the system,

m is the mass of the system,

c is the specific heat capacity of the system and

Δ T is the change in temperature of the system.

Substituting the values in the equation

m = 150g

Q=500 Joules

[tex]\rm c_{p}[/tex] = 4.18 J/gxC

500 = 150 * 4.18* Δ T

Δ T = 0.797 °C

Therefore the change in temperature of 150 grams of water when gains 500 Joules of energy is 0.797 °C .

To know more about Heat Transfer

https://brainly.com/question/13433948

#SPJ1

The river will deposit sediment along the inside of a bend in the river. This deposition causes the inside of the curve to become shallower and move farther inward.

Rivers flowing over gently sloping ground begin to curve back and forth across the landscape. These are called meandering rivers.

Meandering rivers erode sediment Larry from the outer curve of each meander bend and deposit it on an inner curve further down stream.

This causes individual meanders to grow larger and larger over time.

Meandering river channels are asymmetrical. The deepest part of the channel is on the outside of each bend. The water flows faster in these deeper sections and erodes material from the river bank.

The water flows more slowly in the shallow areas near the inside of each bend. The slower water can't carry as much sediment and deposits its load on a series of point bars.

Thus  the settling of sediment will make the stream steeper.

To know more about Meandering Rivers

https://brainly.com/question/7560368

#SPJ1

Answer:

The river will deposit sediment along the inside of a bend in the river. The deposition causes the inside of the curve to become shallower and move farther inward.

Explanation:

Edmentum

Answer:

information from station to receiver

Convert vol to L

Apply Boyles law

[tex]\large{\underline{\underline{\pmb{\sf{\pink{Ꮧnswer:-}}}}}}[/tex]

P1V1 = P2V2

V2 =P1V1/P2

=(742×500)/(795) = 467mL CO2

The mass of copper that will be produced from copper oxide is determined as 3.19 g.

The mass of copper that will be produced from copper oxide is calculated as follows;

2Cu + O₂  -----> 2CuO

2          1             2

2(63.5) ------------ 2(79.5)

x ---------------------- 4 g

x = (4 x 2 x 63.5)/(2 x 79.5)

x = 3.19 g

Thus, the mass of copper that will be produced from copper oxide is determined as 3.19 g.

Learn more about copper here: https://brainly.com/question/24856041

#SPJ1

Answer:

On heating sodium hydrogen carbonate (NaHCO3). It decomposes to form sodium carbonate (Na2CO3), water (H2O) and carbon dioxide (CO2)

(ii) 2NaHCO3(s)Heatsodiumcarbonate(sodaash)Na2CO3(s)+CO2(g)+H2O(l)

Answer:

Explanation:

2H + + CO3 2- = H2CO3

Avogadro's law states that in every mole of a substance, there are [tex]6.022 \times 10^{23}[/tex] particles.

This means that in [tex]9.54 \times 10^{23}[/tex] molecules, there are [tex]\frac{9.54 \times 10^{23}}{6.022 \times 10^{23}}=\boxed{1.58 \text{ moles (to 3 sf)}}[/tex]

Answer:

The answer is Erosion, Weathering,

Explanation:

These all seem to be correct but i know for a fact those two are correct.

Answer:

176g

Explanation:

Given :

moles = 5.5

molar mass (sulfur ) = 32u

given mass = ?

Solution:

mole = given mass/molar mass

5.5 = given mass/ 32

5.5×32=given mass

176 g = given mass

Answer:

Use energy sources that do not release greenhouse gases into the atmosphere.

Explanation:

If you use energy that does not release greenhouse gases such as CO2 then the heat won't be trapped in our environment, thus less chances of global warming. Option A is nonsense, B does not make sense either. C is the only valid way.

Answer:

E.

Explanation:

Look at change in concentration over time...is it increasing or decreasing? It is increasing right as you can see because it starts at 0 then increases and plataeus. What increases in a reaction, reactant or product? Products increase right cuz your reactants react with each other to make prodcuts.

At start of reaction you have no products (zero) thus this graph starts at 0. At end you have alot of product thus over time the concentration of product increases.

ABC are reactants their concentration should decrease over time

DE are products, they should increase as reaction goes on.

Answer:

Carbon has an atomic number of 6. That means a carbon atom has 6 protons, 6 neutrons, and 6 electrons.

Answer:

it is a weak acid

acid

Explanation:

formaldehyde is a weak acid (pK greater than 13),

Answer:

Sunlight

Explanation:

A producer include green plants, small shrubs, fruit, phytoplankton, and algae. None are which are "sunlight".

Because:

Their roots are no longer in the soil. Thus, can't absorb water and mineral ions needed for plant growth via photosynthesis.

Hope this helps!

Answer:

Yes

Explanation:

Well this is because when a plant is planted water goes from the soil, into the roots then finally distributed to other parts of the plant.

So when plants have been plucked or uprooted water no longer has access to the plant which may result to the plant being dried up and will possibly die

Answer:

1. Molecular solids are usually excellent conductors of electric current.

Explanation:

Molecular solids are actually insulators (prevent electricity).

The pressure of the N₂ collected if the temperature was 22°C celcius is 98.6823 kPa.

What is atmospheric pressure?

The air around you has weight, and it presses against everything it touches. That pressure is called atmospheric pressure, or air pressure.

Atmospheric pressure = 101.325 kPa

Vapor pressure of water at 22°C = 2.6427 kPa

Pressure of N₂ = (Atmospheric pressure) - (vapour pressure of water at 22°C)

Pressure of N₂ = (101.325 kPa) - ( 2.6427 kPa)

Pressure of N₂ = 98.6823 kPa

Therefore, the pressure of the N₂ collected if the temperature was 22°C celcius is 98.6823 kPa.

Learn more about atmospheric pressure here:

https://brainly.com/question/6492699

#SPJ1