how many moles of CaO are needed to react with excess water to produce 370g of calcium hydroxide?

Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 7.475 moles are present in 4.5 x 10²⁴ atoms of oxygen.

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.

Mathematically, the formula for the number of moles can be given as

number of mole =given number of atoms ÷ 6.022×10²³(Avogadro number)

number of atoms of oxygen=4.5 x 10²⁴atoms

Substituting all the given values in the above equation, we get

number of atoms of oxygen=(4.5 x 10²⁴)/(6.02 x 10²³)

number of atoms of oxygen= 7.475 mole

Therefore, 7.475 moles are present in 4.5 x 10²⁴ atoms of oxygen.

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Answer:

D

Explanation:

the stuff being dissolved when making a solution

it is dissolved in the solvent

Answer:

C. slightly basic

Explanation:

0-7 = acidic

7 = neutral

7-14 = basic

- Since the pH is just over 7, the answer would be slightly basic.

- Hope this helps! Please let me know if you need a further explanation.

The human blood having a pH between 7.35 and 7.45 simply means the blood is slightly basic.

The correct answer to the question is Option C. slightly basic.

The pH of a solution is simply a measure of the acidicity or alkalinity of the solution.

The pH scale ranging from 0 to 14 gives a discription of the acidicity or alkalinity of a solution as follow:

0 to 6 => acidic

7 => Neutral

8 to 14 => Basic

From the question given above,

The pH of the blood reads between 7.35 and 7.45.

This simply implies that the human blood is slightly basic as the pH reading of the blood is a little above the neutral mark (i.e 7) of the pH scale.

Therefore, Option C. slightly basic. gives the correct answer to the question.

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Answer:

Explanation:

1. Get a pillow

2. Find a bed or a couch

3. Get a comfy blanket

4. SLEEP

Answer:

d. less energy required

Explanation:

it said it in my book and i took the edg quiz

Answer:

[tex]\large \boxed{\text{5.40 mol}}[/tex]

Explanation:

[tex]\text{Moles of water} = 3.25 \times 10^{24}\text{ molecules} \times \dfrac{\text{1 mol }}{6.022 \times\ 10^{23} \text{molecules}} = \textbf{5.40 mol}[/tex]

Answer:

c

Explanation:

got it right on assignment

Final answer:

A net ionic equation reflects only the participating ions in a chemical reaction, omitting the spectators. For HCl reacting with NaOH, it is H+(aq) + OH−(aq) → H₂O(l). For AgNO₃ reacting with NaCl, it is Ag+(aq) + Cl−(aq) → AgCl(s).

Explanation:

What is a Net Ionic Equation?

The net ionic equation shows the chemical equation that includes only the reacting ions in a solution and omits the spectator ions. Spectator ions are those that do not participate directly in the chemical reaction and which remain in the solution unchanged. This simplification helps to focus on the actual chemical change taking place. For example, if we consider the reaction of hydrochloric acid (HCl) with sodium hydroxide (NaOH), we start with the complete ionic equation:

H+(aq) + Cl−(aq) +Na+(aq) + OH−(aq) → H₂O(l) + Na+(aq) + Cl−(aq)

In this reaction, sodium ions (Na+) and chloride ions (Cl−) are spectator ions, as they do not change during the reaction. We can remove them to obtain the net ionic equation, which demonstrates the actual chemical change:

H+(aq) + OH−(aq) → H₂O(l)

Similarly, if we were to use a different example such as the precipitation reaction between silver nitrate (AgNO₃) and sodium chloride (NaCl), the net ionic equation would be:

Ag+(aq) + Cl−(aq) → AgCl(s)

This representation highlights the formation of silver chloride precipitate from the reacting ions, omitting the spectator sodium (Na+) and nitrate (NO₃−) ions.

Answer:

Explanation:

but what is it.

Final answer:

The balanced complete ionic equation for the reaction between Na₂CO₃ and AgNO₃ in aqueous solution is 2Na+ + 2NO₃- + CO₃²- + 2Ag+ → 2Na+ + 2NO₃- + Ag₂CO₃. The sodium and nitrate ions can be eliminated from the equation since they appear unchanged on both sides. The net ionic equation is CO₃²- + 2Ag+ → Ag₂CO₃.

Explanation:

Balanced Complete Ionic Equation:

2Na+(aq) + 2NO3-(aq) + CO32-(aq) + 2Ag+(aq) → 2Na+(aq) + 2NO3-(aq) + Ag2CO3(s)

In this reaction, the sodium ion (Na+) and the nitrate ion (NO3-) appear unchanged on both sides of the equation, so they can be eliminated from the reaction.

Net ionic equation:

CO32-(aq) + 2Ag+(aq) → Ag2CO3(s)

Answer:keep feet dry, avoid sharing things, wear cotton socks. That’s all

Answer:

A

it on the explanation for ms yoder

Answer:

0.60 mol H₂

General Formula and Concepts:

Chemistry - Gas Laws

Ideal Gas Law: PV = nRT

Explanation:

Step 1: Define Variables

P = 1.4 atm

T = 430 K

R = 0.0821 (L · atm)/(mol · K)

V = 15.1 L

n = unknown

Step 2: Solve for n

Step 3: Check

We are given 2 sig figs as our lowest. Follow sig fig rules and round.

0.598816 mol H₂ ≈ 0.60 mol H₂

Final answer:

Approximately 0.268 moles of hydrogen gas are necessary to exert a pressure of 1.4 ATM at 430 K and occupy a volume of 15.1 L.

Explanation:

To calculate the amount of hydrogen gas necessary to exert a pressure of 1.4 ATM at 430 K and occupy a volume of 15.1 L, we can use the ideal gas law equation:

PV = nRT

Where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin.

Rearranging the equation to solve for the number of moles:

n = PV / RT

Substituting the given values:

n = (1.4 ATM) * (15.1 L) / (0.0821 L*ATM/(mol*K)) * (430 K)

Simplifying the equation yields:

n = 0.26796 mol

Therefore, approximately 0.268 moles of hydrogen gas are necessary to exert a pressure of 1.4 ATM at 430 K and occupy a volume of 15.1 L.

  I think the answer is it turnes into a gas. Hope it helps! :) Asnwer is density.

A solid sample of oil is warmed until it turns into a liquid. Density is the  property of the oil will decrease.

Density is the measurement of how tightly a material is packed together. It is defined as the mass per unit volume. Density Symbol: D or ρ Density Formula: ρ = m/V, where ρ is the density, m is the mass of the object and V is the volume of the object.

As temperatures rose, the density of all oils decreased. The temperature coefficients of density change differed slightly between oils. The density differentials between oil and water, as well as their temperature coefficients, varied significantly between oils.

Oil is denser than alcohol but denser than water. Because the molecules that make up oil are larger than those that make up water, they cannot pack as tightly as water molecules can. They occupy more space per unit area and have a lower density.

Thus, Density is the  property of the oil will decrease.

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Answer: Given equal masses, water will heat up less than wood if the same heat is added.

Answer:

The correct answer is c

Answer:

value of x is -4 to solve 8=2×+4

Answer:

x=-4

Explanation:

just took test

Answer: By going solar, you can reduce demand for fossil fuels, limit greenhouse gas emissions, and shrink your carbon footprint

Explanation:

Answer : The volume of nitrogen gas equal to [tex]3.42\times 10^{22}[/tex] molecules of this substance is, 1.27 liters.

Explanation :

First we have to calculate the moles of nitrogen gas.

As, [tex]6.022\times 10^{23}[/tex] molecules present in 1 mole of nitrogen gas

So, [tex]3.42\times 10^{22}[/tex] molecules present in [tex]\frac{3.42\times 10^{22}}{6.022\times 10^{23}}=0.0568[/tex]mole of nitrogen gas

Now we have to calculate the volume of nitrogen gas.

As we know that, 1 mole of substance occupies 22.4 L volume of gas at STP.

As, 1 mole of nitrogen gas occupies 22.4 L volume of nitrogen gas

So, 0.0568 mole of nitrogen gas occupies [tex]0.0568\times 22.4=1.27L[/tex] volume of nitrogen gas

Therefore, the volume of nitrogen gas equal to [tex]3.42\times 10^{22}[/tex] molecules of this substance is, 1.27 liters.

Answer:

1.27

Explanation:

This is an incomplete question, here is a complete question.

Phosphorus trifluoride is formed from its elements.

[tex]P_4(s)+6F_2(g)\rightarrow 4PF_3(g)[/tex]

How many grams of fluorine are needed to react with 6.20 g of phosphorus?

Answer : The mass of [tex]F_2[/tex] needed are, 11.4 grams.

Explanation : Given,

Mass of [tex]P_4[/tex] = 6.20 g

Molar mass of [tex]P_4[/tex] = 124 g/mol

Molar mass of [tex]F_2[/tex] = 38 g/mol

First we have to calculate the moles of [tex]P_4[/tex]

[tex]\text{Moles of }P_4=\frac{\text{Given mass }P_4}{\text{Molar mass }P_4}[/tex]

[tex]\text{Moles of }P_4=\frac{6.20g}{124g/mol}=0.05mol[/tex]

Now we have to calculate the moles of [tex]F_2[/tex]

The balanced chemical equation is:

[tex]P_4(s)+6F_2(g)\rightarrow 4PF_3(g)[/tex]

From the balanced reaction we conclude that

As, 1 mole of [tex]P_4[/tex] react with 6 moles of [tex]F_2[/tex]

So, 0.05 moles of [tex]P_4[/tex] react with [tex]0.05\times 6=0.30[/tex] moles of [tex]F_2[/tex]

Now we have to calculate the mass of [tex]F_2[/tex]

[tex]\text{ Mass of }F_2=\text{ Moles of }F_2\times \text{ Molar mass of }F_2[/tex]

[tex]\text{ Mass of }F_2=(0.30moles)\times (38g/mole)=11.4g[/tex]

Therefore, the mass of [tex]F_2[/tex] needed are, 11.4 grams.

The mass of F2  that should be required to react with 6.20 g should be 11.4 grams.

Since

Mass of P4 is 6.20g

The molar mass of P4 is 124 g/mol.

And, the molar mass of F2 is 38 g/mol.

Now the moles of P4 is

= Given mass / molar mass

= 6.20/124

= 0.05 mol

Now the moels of F2 is

= Moles of P4 * 6

= 0.05 * 6

= 0.30 moles

So, here the mass is

= Moles of F2 * molar mass of F2

= 0.30 * 38

= 11.4 grams

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Answer:

Below.

Explanation:

Magnesium hydroxide + Hydrogen Sulphate -->    Magnesium Sulphate + Water

The balanced equation:

Mg(OH)2 + H2SO4 ---> MgSO4 + 2H2O

Answer:

What reaction is balanced

Answer:

6 CO2 + 6H2O produces 1 C6H12O6 + 6O2

Explanation:

Answer:

7.875 grams

Explanation:

You multiply 175 g by .045

This gives you 7.875 grams of lactose

Final answer:

The mass of lactose present in 175 g of cow's milk, which contains 4.5% lactose by mass, is 7.875 grams.

Explanation:

Mass is a fundamental physical quantity that represents the amount of matter in an object. It is a scalar quantity, meaning it has magnitude but no direction. Mass is typically measured in units such as kilograms (kg) or grams (g). In classical mechanics, mass plays a crucial role in determining an object's inertia, which is its resistance to changes in motion.

To calculate the mass of lactose present in 175 g of cow's milk, which contains 4.5% lactose by mass, you can use the following formula:

Mass of lactose = (Percentage of lactose by mass) × (Total mass of the milk)

Mass of lactose = 0.045 × 175 g = 7.875 g

Therefore, the mass of lactose present in 175 g of milk is 7.875 grams.

The answer is C. Potassium and D. Lithium.

The correct answers to which elements have an oxidation number of 1 are C. Potassium and D. Lithium, as both are group 1 alkali metals that typically form ions with a +1 charge.

Both potassium and lithium belong to the group 1 elements of the periodic table, also known as the alkali metals. These metals typically have a +1 oxidation state when forming compounds. Potassium (K) for example, readily loses one electron to form a K+ ion, also known as a monovalent cation. Similarly, lithium (Li) will also lose one electron to form an oxidation state of +1.

Magnesium (Mg) and Calcium (Ca), on the other hand, form ions with a 2+ charge, indicating an oxidation state of +2. For instance, in [tex]MgCl_2[/tex], magnesium has an oxidation number of +2. Therefore, options A. Magnesium and B. Calcium do not have an oxidation number of 1 and are not correct answers to the question.

Answer: True

Explanation:

Land surfaces absorb much more solar radiation than water. This is due to the fact that most land surfaces are darker than water which of course means more absorption of solar radiation and heat.

Answer: 9.5

Explanation:

The moles needed to make 2.5 L of a 3.8 M solution is 9.5 moles.

It is defined as moles of solute in certain volume of Solvent.

The units of Molarity is mol/L or Molar(M)

Molarity = moles of solute /  Volume of Solvent

It is given that a 2.5 L , 3.8 M solution

Let n be the number of moles needed

M = n/V

Substituting the values in the equation

3.8 =  n /2.5

n = 3.8 * 2.5

n = 9.5 moles

Therefore the moles needed to make 2.5 L of a 3.8 M solution is 9.5 moles.

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Answer:

electromagnetic radiation

Explanation:

I had a quiz abt it

Answer:

The protection of internal environment from the harms of fluctuations in external environment is termed as homeostasis.

Explanation:

Homeostasis is the central requirement in the maintenance of an organism, which compels the adaptations in the constant changing condition and contribute in evolutionary process.

Maintaining homeostasis is crucial for all organisms to regulate their internal environment, adapt to environmental changes, and ensure their survival. A loss of homeostasis can cause diseases and negatively impact an organism's health.

Maintaining homeostasis is essential for the survival and well-being of all organisms. Homeostasis refers to the ability of an organism to regulate its internal environment, irrespective of changes in external conditions. This function is carried out by a myriad of biological processes and systems; for example, thermoregulation helps maintain a constant body temperature, and osmoregulation helps control the water and ion concentrations.

Exhibiting a lack of homeostasis can lead to great physiological stress and might be detrimental to the organism's survival. For example, in humans, a deviation from homeostasis can cause diseases such as diabetes, where the body fails to regulate blood glucose levels.

In conclusion, maintaining homeostasis is fundamentally important as it assures that all organisms can adapt to environmental changes, ensuring their survival and continued growth and development.

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Answer:

Explanation:

it is important for cattle ranchers to understand the basics of chemistry because feeding and health of their valuable animals rely in the principles of chemical science.

Understanding what elements or compounds animal food must contain for the animals grow better is an esential part of animal husbandry.

The same can be said about the vitamins, drugs, antibiotics, and medicines in general, needed by the livestock to be healthy and cure diseases.

Chemistry involves the study of the substances, their propeties, and how to combine them (chemical reactions) which is the basis of the nutritrion and medicine; two essential parts of cattle breeding.