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Answer:

Average atomic mass =

(mass of isotope)(%abundance)+(mass of isotope) ( abundance ) / 100

avg. atomic mass =(12)(98.89) + (13)(1.11) /100

=1186.68 + 14.43 / 100

=1201.11 / 100

=12.0111

The two best characteristic best describes the reputable digital resource are the precision and accuracy.

Explanation :The more the accuracy the better the digital product.

Any slight error on application or usage may result in severe loss on product manufacturing and also loss in application purpose.

The number of moles in 25 grams of oxygen is equal to 1.56 moles, as 16 grams of oxygen contain one mole.

A mole is a unit measurement that is used to calculate a large number of chemical entities such as atoms, molecules, ions, or other particular particles.

The mass of the one mole of any chemical element in the periodic table is called atomic mass and that of any compound is known as molar mass.

The number of chemical entities present in one mole was found to be equal to approximately 6.023 × 10 ²³ which is known as Avogadro’s number. In the calculation of the number of moles of a substance the given mass of the substance is divided by its molecular mass.

Given, the mass of the oxygen = 25 grams

As we know the atomic mass of oxygen is equal to 16g/mol

So 16 g of oxygen contains moles = 1

Then 25 g of oxygen will contain moles = 25/16 = 1.56 mol

Therefore, the moles of oxygen in 25 grams are equal to 1.56.

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The salivary amylase did not perform well if the pH becomes lower because it needs neutral pH for performing its functions.

We can say that the salivary amylase did not perform their function very well within the stomach due to unfavourable environment such as lower pH. Due to lower pH, the enzyme structure is damaged so unable to perform its function so we can conclude that the salivary amylase did not perform well if the pH becomes lower.

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Answer:

To determine if the forces acting upon an object are balanced or unbalanced, an analysis must first be conducted to determine what forces are acting upon the object and in what direction. If two individual forces are of equal magnitude and opposite direction, then the forces are said to be balanced

Explanation:

Answer:

About 21.2 moles.

Explanation:

Recall the ideal gas law:

[tex]\displaystyle PV = nRT[/tex]

Where P is the pressure of the gas; V is its volume; n is the number of moles of gas; R is the universal gas constant; and T is the absolute temperature.

Rearrange to solve for n:

[tex]\displaystyle n = \frac{PV}{RT}[/tex]

Because R has units of L-atm/mol-K, convert the pressure to atm:

[tex]\displaystyle 1720 \text{ kPa} \cdot \frac{1\text{ atm}}{101.3\text{ kPa}} = 17.0\text{ atm}[/tex]

And convert from Celsius to kelvins:
[tex]\displaystyle \begin{aligned}T _ k & = T_C + 273.15 \\ \\ & = (20.0) + 273.15 \\ \\ & = 293.2\text{ K} \end{aligned}[/tex]

Hence substitute and evaluate:
[tex]\displaystyle \begin{aligned} n & = \frac{PV}{RT} \\ \\ & = \frac{\left(17.0\text{ atm})(30.00\text{ L})}{\left(\dfrac{0.08206\text{ L-atm}}{\text{mol-K}}\right)(293.2\text{ K})} \\ \\ & = 21.2\text{ mol } \end{aligned}[/tex]

In conclusion, there are about 21.2 moles of acetylene in the tank.

Answer:

Nuclear fission is almost 5 times times more efficient than traditional fossil fuels at producing energy. That's a lot of energy packed into a small space. Nuclear energy is more efficient, which means it uses less fuel to power the plant and produces less waste.

Explanation:

Answer:

It helps us to insure what will the current rate will be to those subject or nartual disaster can conquere

Answer:

o cany give because of i am in 9th

Answer:

[tex]p2 = 0.175atm[/tex]

Answer:

The answer is A!!!

Explanation:

just took the quiz on edge:)

Answer:

The answer that you are looking for is A.) wool, silkworm cocoon, and cellulose

Explanation:

I got it right on edge 2020. 100%

Answer:According to Dalton's law of partial pressures, the total pressure is equal to the sum of the partial pressures of each gas.  In equation form, this looks like this ...

Pt = P1 + P2 + ...

Pt = total pressure

P1 = partial pressure of gas 1

P2 = partial pressure of gas 2

Explanation:

Water is able to dissolve polar or ionic solutes.

Water is a liquid that is transparent or colourless, tasteless and odourless which form the Earth hydrosphere and can be use for fringing, cooking, washing, feeding animals and so on.

Polar or ionic solvents dissolve polar or ionic solutes. Polar Substance are substances that can dissolve in water completely or polar solvent.

Water is a polar solvent and it can dissolve polar solute.

Therefore, Water is able to dissolve polar or ionic solutes.

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Answer:

the answer is d ionic and polar

Explanation:

just took the quiz and got it right

Answer:

no

Explanation:

trust me i got it right on my test

Lithium oxide ever be a liquid on any of the planet's or moon in our system - No.

Lithium oxide is an inorganic compound with the chemical formula Li₂O, and it present in white solid form.

Lithium oxide is a strong base and on reacting with water will form lithium hydroxide. In this Lithium oxide compound atrong ionic bonds is present with great attraction force. Melting point of Lithium oxide is 1,438 degree celsius and no planet and moon have this much of temperature.

So, it is not possible to get liquid Lithium oxide in our system.

Hence, answer is NO.

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Answer:

lower

Explanation:

For a spontaneous process, the standard Gibbs free energy change has to be less than zero:

∆G° < 0 → spontaneous

∆G° > 0 → non- spontaneous

∆G° = 0 → system is at equilibrium

For a negative change in standard Gibbs free energy, the Gibbs free energy of the products has to be lower than that of the reactants since Gibbs free energy change is the standard Gibbs free energy of products minus that of the reactants.

[tex]\boxed{∆G= G°(products) -G°(reactants)}[/tex]

Mathematical derivation:

G°(products) -G°(reactants) < 0

G°(products) < G° (reactants)

✩ Note that in the image attached, the Gibbs free energy change is usually denoted by a single-headed arrow, from reactants to products.

What is free energy?

Standard state conditions

Spontaneity

Answer:It is always greater than the actual mechanical advantage because all machines must overcome friction. The mechanical advantage of a machine may be greater than, less than, or equal to 1, depending on the type of machine.

The mass of hydrogen reacted with nitrogen to give ammonia is 0.1 grams.

Mass of any substance will be calculated by using the moles as:

n = W/M, where

W = required mass

M = molar mass

Given chemical reaction is:

3H₂ + N₂ → 2NH₃

Moles of 0.575 g of NH₃ will be calculated as:

n = 0.575g / 17.03g/mol = 0.033 moles

From the stoichiometry of the reaction, it is clear that:

2 moles of NH₃ = produced by 3 moles of H₂

0.033 moles of NH₃ = produced by 3/2×0.033=0.0495 moles of H₂

Now we calculate the mass of hydrogen from the given moles and molar mass as:
W = (0.0495mol)(2.0158g/mol) = 0.09 grams = 0.10 grams

Hence, option (a) is correct i.e. 0.1 grams.

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Explanation:

1. volume

2. pressure

3. moles

4. temperature

5. temperature

6. moles

7. pressure

8. volume

9. pressure

10. volume

Answer:  or Sodium carbonate.

              or Potassium permanganate

Explanation: ion carries 1 + charge whereas carbonate ion carries overall charge of -2. So for every carbonate ion, two sodium ions combine to balance the charges and thus form a stable compound,

Potassium ion carries 1 + charge where as permanganate ion carries overall charge of -1. So for every permanganate ion, one potassium ion combines to balance the charges and thus form a stable compound,  Explanation:

Answer:

I think it is called a Mixture

Explanation:

Sorry if it is wrong

Answer:

decreases

i think so

byeeee

Answer:

D

Explanation:

In the problem above it is

q = mass x heat fusion

q = 10 g x 334 J/g = 3340 J. Since the ice is absorbing heat it is + 334 J.

Answer:

3.34 kJ

Explanation:

took the test

Answer:

Explanation:

The density of a substance can be found by using the formula

[tex]density = \frac{mass}{volume} \\[/tex]

1 kg = 1000 g

2.06 kg = 2060 g

1 L = 1000 cm³

2 L = 2000 cm³

mass = 2060 g

volume = 2000 cm³

We have

[tex]density = \frac{2060}{2000} = \frac{103}{100} \\ [/tex]

We have the final answer as

Hope this helps you

Answer:

The density of milk is 1.03 g/cm³.

Explanation:

Given data:

Volume of milk = 2.00 L

Mass of milk = 2.06 kg

Density of milk = ?

Solution:

We know that density is equal to the mass divided by volume.

we will convert the unit first because we require the density in g/cm³.

2.06 kg ×1000 g/ 1 kg = 2060 g

2.00 L × 1000 mL / 1L = 2000 mL

d = m/v

d = 2060 g/2000 mL

d = 1.03 g/mL

mL = cm³

d = 1.03 g/cm³

Thus, density of milk is 1.03 g/cm³.

Answer:

It is A

Explanation:

If you think about it, no-polar covalent bonds are in a symmetrical line, and polar bonds are on the diagonals of the center atom.

I hope I helped :)

Answer:b

Explanation:

Answer:

thermal energy is produced when a rise in temperature causes atoms and molecules to move faster and collide with each other.

Explanation:

I'm pretty sure its that. Hope its right!

Answer:

says wrong

Explanation:

Answer:

In very simple words ,

As the weight increases the gravitational force acting on the ball increases and thus it effects the change in the distance of the ball as the ball will fall very close to its initial distance if it has more mass and shall go far if the mass is less .

Answer:

Asexual reproduction

Explanation:

for microorganism to reproduce and spread, the microorganism uses a process of cell division called mitosis, where the microorganism divides it self into two individual microorganism by mitosis using Asexual reproduction (an organism dividing itself into 2 individual organism not involving sexual activities, called Asexual reproduction). for these microorganisms to be able to reproduce Asexually that makes it much faster for these organisms to spread much more faster then mammals of other Sexually reproductive organisms.

Answer:

I believe 83.33 mL is needed. :)