help! Homework due tomorrow ​

Answer:

mass of water: 8.9 g

Explanation:

Hey there its simple:

mass of water: mass of cylinder with water filled - mass of empty cylinder

mass of water: 32 g - 23.1 g

mass of water: 8.9 g

Answer:

2.765 × × 10³ moles of O₂

Explanation:

The chemical equation to produce water from oxygen and hydrogen is;

2H₂ (g) + O₂ (g) = 2H₂O (l)

From the equation above, we see that;

2 moles of H₂O is produced from 1 mole of O₂

Thus; 5.53 × 10³ moles of H₂O  will require;

(5.53 x 10³ moles of H₂O × 1 mole of O₂)/2 moles of H₂O = 2.765 × × 10³ moles of O₂

Answer: Think and you will get it right!

Explanation:

To find the mass percent composition of an element, divide the mass contribution of the element by the total molecular mass. This number must then be multiplied by 100% to be expressed as a percent.

Answer:

404.47692 g

Explanation:

Na₂CO₃ + Ca(NO₃)₂ ⇒ CaCO₃ + 2NaNO₃

From the coefficients in the balanced chemical equation, we see that the ratio of Ca(NO₃)₂ and 2NaNO₃ is 1:2, so every 1 mol of Ca(NO₃)₂ produces 2 mols of 2NaNO₃.

(4.93 mol NaNO₃)([tex]\frac{Ca(NO3)2}{2NaNO3}[/tex]) = 2.465 mol Ca(NO₃)₂

Then, we need to convert from moles to grams, since we are asked to find the mass of Ca(NO₃)₂. To do this, we need to look up the molar mass of Ca(NO₃)₂, which is 164.088 g/mol.

(2.465 mol Ca(NO₃)₂ ) (  [tex]\frac{164.088 g}{1 mol}[/tex]) =  404.47692 g

Thus,  404.47692 grams of Ca(NO₃)₂ is needed to produce 4.93 mol of 2NaNO₃.

Answer:

where are the following organisms

A 12.1 M HCl solution with a density of 1.19 g/mL has a molality of 16.1 m.

Molality is defined as the total moles of a solute contained in a kilogram of a solvent.

Let's suppose we have 1 L of the solution.

The solution is 12.1 M, that is, there are 12.1 moles of HCl in 1 L of solution.

The molar mass of HCl is 36.465 g/mol.

12.1 mol × 36.465 g/mol = 441 g

The density of the solution is 1.19 g/mL.

1000 mL × 1.19 g/mL = 1190 g

In 1190 g of solution, there are 441 g of HCl.

mWater = 1190 g - 441 g = 749 g = 0.749 kg

b = 12.1 mol / 0.749 kg = 16.1 m

A 12.1 M HCl solution with a density of 1.19 g/mL has a molality of 16.1 m.

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Answer:

Air conditionded building

Explanation: Ice cream is processed food so techniacally it could be using technology but Air conditioning is a unit of metal and is built. Hope this is right!

Answer:

Rounding for significant figures gives us a final answer of 3.41×1022 atoms 3.41 × 10 22 a t o m s atoms of oxygen.

The oxygen atoms in 4.00 g of quartz is 8.4 x 10²² atoms of oxygen.

Atoms are defined as a smallest unit into which matter can be divided without the release of electrically charged particles.

It can also be defined as a building block of matter and were created after big bang theory.

The amount of mole of SiO₂ in 4.00 grams

= 4.00 / 60 = 0.07 moles

As 2 atoms of oxygen atoms are present in quartz formula, the number of mole of O₂ in this formula

= 2 x 0.07 = 0.14 mole

So, the amount of O₂ in 4.00 g of quartz

= 6.02 x 10²³ x 0.14

= 8.4 x 10²² atoms of oxygen.

Thus, the oxygen atoms in 4.00 g of quartz is 8.4 x 10²² atoms of oxygen.

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The balanced equation is:

4 NO(g) + O₂(g) ⇒ 2 N₂O₃(g)

The expression of the rate in terms of change in concentrations are:

[tex]v = \frac{-\Delta [NO]}{4\Delta t } = \frac{-\Delta [O_2]}{1\Delta t } = \frac{\Delta [N_2O_3]}{2\Delta t }[/tex]

When N₂O₃ is forming at 0.221 M/s, NO is disappearing at 0.442 M/s.

The reaction rate is the speed at which a chemical reaction takes place, defined as proportional to the increase in the concentration of a product per unit time and to the decrease in the concentration of a reactant per unit time.

4 NO(g) + O₂(g) ⇒ 2 N₂O₃(g)

We will need to consider the stoichiometric coefficient of each species.

[tex]v = \frac{-\Delta [NO]}{4\Delta t } = \frac{-\Delta [O_2]}{1\Delta t } = \frac{\Delta [N_2O_3]}{2\Delta t }[/tex]

The molar ratio of NO to N₂O₃ is 4:2.

[tex]\frac{0.221molN_2O3}{L.s} \times \frac{4molNO}{2molN_2O_3} = \frac{0.442 molNO}{L.s}[/tex]

The balanced equation is:

4 NO(g) + O₂(g) ⇒ 2 N₂O₃(g)

The expression of the rate in terms of change in concentrations are:

[tex]v = \frac{-\Delta [NO]}{4\Delta t } = \frac{-\Delta [O_2]}{1\Delta t } = \frac{\Delta [N_2O_3]}{2\Delta t }[/tex]

When N₂O₃ is forming at 0.221 M/s, NO is disappearing at 0.442 M/s.

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Answer:

i got 6

Explanation:

Because 14 feet divide by 20.5 gives you 0.6

so it 0.6 times 10 =6

Answer:

140 square feet

Explanation:

Given the following question:

Room is 14 feet wide = the width
20.5 feet long = the length
10-foot ceilings = the height

Area = Width × Height

[tex]A=10\times14=140[/tex]
[tex]A=140 ft^2[/tex]

The area of the room is "140 square feet."

Hope this helps.

C to D

Explanation:

it rises faster between those two points

Answer:

( essay ) a time when i got lost somewhere

A solution has an absorbance of 0.2 with a path length of 1 cm. Given the molar absorptivity coefficient is 59 cm⁻¹ M⁻¹, the molarity is 0.003 M.

The Beer-Lambert law states that for a given material sample, path length and concentration of the sample are directly proportional to the absorbance of the light.

A solution has an absorbance of 0.2 with a path length of 1 cm. Given the molar absorptivity coefficient is 59 cm⁻¹ M⁻¹, we can calculate the molarity of the solution using the following expression.

A = ε × b × c

c = A / ε × b

c = 0.2 / (59 cm⁻¹ M⁻¹) × 1 cm = 0.003 M

where,

A solution has an absorbance of 0.2 with a path length of 1 cm. Given the molar absorptivity coefficient is 59 cm⁻¹ M⁻¹, the molarity is 0.003 M.

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Answer:

5 feet 6 inches is the optimal height for a human

The atom that has the smallest diameter will have the greatest electron attraction, so the electrons will be difficult to escape

So atom R will lose its electron most reluctantly

Answer:

c

Explanation:

edge 2022

Answer:

received 2 electrons

Explanation:

Since a neutrally charged oxygen has 8 electrons (-) and 8 protons (+), an oxygen ion with a charge of -2 and would have 10 electrons.

Answer:

farther apart; increasing

Explanation:

The particles in a liquid are less tightly packed together so an increase in pressure makes the particles in a liquid get farther apart.

[tex]\bold{\huge{\orange{\underline{ Solution}}}}[/tex]

[tex]\bold{\underline{ Given :- }}[/tex]

[tex]\bold{\underline{ To \: Find :- }}[/tex]

[tex]\bold{\underline{ Let's \:Begin:- }}[/tex]

We know that,

Amount of heat energy = mass * specific heat * change in temperature

That is,

[tex]\sf{\red{ Q = mcΔT }}[/tex]

Subsitute the required values in the above formula :-

[tex]\sf{ Q = 250 × 4.180 ×(0 - 100 )}[/tex]

[tex]\sf{ Q = 250 × 4.180 × - 100 }[/tex]

[tex]\sf{ Q = 250 × - 418}[/tex]

[tex]\sf{\pink{ Q = - 104,500 J }}[/tex]

Hence, 104,500 J of heat is released to cool 250 grams of liquid water from 100° C to 0° C.

[tex]\bold{\underline{ Now :- }}[/tex]

We have to tell whether the above process is endothermic or exothermic :-

Here, In the above process ΔT is negative and as a result of it Q is also negative that means above process is Exothermic

Answer:

Increase

Increase

Explanation:

By increasing the activation energy (Ea) the rate constant decreases and by increasing the temperature (T) the rate constant increases.

The rate constant is also known as specific rate constant is a proportionality factor between rate of reaction and concentration.

[tex]k = Ae^{-\frac{Ea}{RT}}[/tex]

Where,

k = Chemical reaction rate

A = Pre-exponential Factor

Ea = Activation energy

R = Gas constant

T = Temperature

Now, check whether the following change increases or decreases the rate constant.

Increasing Ea

According to the Arrhenius Equation the higher the activation energy, the slower the reaction. Rate constant increases exponentially with decreasing Ea and increasing T.  So by increasing activation energy (Ea) decreases the rate.

Increasing T

The rate constant increases with increase in temperature. increasing the T of a reaction increases the rate because the rate constant increases a/q to the Arrhenius Equation. So by increasing the temperature increases the rate.

Thus, we can conclude that by increasing the activation energy (Ea) the rate constant decreases and by increasing the temperature (T) the rate constant increases.

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Based on the mass ratio of reactants, 23.5 g of sodium nitrate is produced from the reactants.

The mass ratio of a reaction is the ratio of the masses of reactants wilhich combine to form products.

The mass of sodium nitrate is determined from the mass ratio.

The equation of the reaction gives the mass ratio as follows:

NaCl + AgNO3 ----> AgCl + NaNO3

Molar mass of NaCl = 58.5 g

Molar mass of AgNO3 = 170 g

Molar mass of AgCl = 143.5

Molar mass of NaNO3 = 85 g

There are 98 grams of sodium chloride, 47 grams of silver nitrate, therefore silver nitrate is the limiting reactant.

47 grams of silver nitrate will produce 85/170 × 47 = 23.5 g of sodium nitrate.

Therefore, 23.5 g of sodium nitrate is produced from the reactants.

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The heat of reaction is the quantity of heat absorbed or emitted in a reaction.

The heat of reaction is the quantity of heat absorbed or emitted in a reaction. This question is incomplete hence the numerical value of the heat of reaction can not be determined.

However, the heat of reaction is determined from the mass of the reactants, the temperature change in the calorimeter and the number of moles of the limiting reactant.

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Answer:

1.8x10_24 moleclues

Explanation:

because you have to divide the numbers  and then times them together

750 x 14,0067 u = 10,505.025 g

Answer:

Filtration is the process of separating solids from liquids using filter paper. The process can be used to separate an insoluble solid, for example, stone or sand grains from a liquid. The liquid could be a pure liquid, for example, water, or it could be a solution, for example, salty water.

Explanation:

Answer:

solids for liquids

Explanation:

The process can be used to separate an insoluble solid, for example stone or sand grains from a liquid.

Answer:

The maximum number of valence electrons is 8

Explanation:

element 3 has 3 valence electrons. 7 has 5, and 10 has 8, as we increased the number of electrons in element 11, the number of valence electrons became 3, and the pattern went on, it cannot exceed 8.

The electron configuration of an atom depicts the arrangement of electrons scattered throughout the orbital shells and subshells.

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Answer:

Solve algebraically by setting the y equal to 0.892 = 0.355x + 0.058. Then subtract the 0.058 over then follow by dividing by 0.355. You will then get the x value equal to your concentration. The answer is 2.676.

Hope this helps!

Explanation:

It should be noted that to calculate Kf for t butyl alcohol, we need to calculate molality.

Your information is incomplete as the figures are not given. Therefore, an overview will be given. To calculate Kf for t butyl alcohol, we need to calculate molality.

Molality will be calculated as:

= mass of solute / (molar mass of solute × mass of solvent)

For example, if the solution has a molality of 0.455 that freezes at 3.17 degrees Celsius, then Kf would be equal to 3.17 divided by 0.455 which is 6.96 degrees Celsius.

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