a mixture of nabr and na2so4 contains 29.96 percent na by mass. calculate the percent by mass of each compound in the mixture

decay rate of approximately 1.69x10^17 Bq (becquerels),

The decay rate of a radioactive sample is determined by the number  of radioactive atoms present and the decay constant, which represents the probability of decay per unit of time.

To calculate the decay rate, we multiply the number of atoms in the sample by the decay constant. In this case, the sample has 8.31x10^17 atoms and a decay constant of 0.203/s. Multiplying these values gives a decay rate of approximately 1.69x10^17 Bq (becquerels), which represents the number of decays per second in the sample.

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Answer:

Mark me brainliest

Explanation:

Standards help avoid confusion and ambiguity when taking measurements. For example, a meter will always be the same length, no matter who is taking the measurement or where it is being taken.

Answer:

89.3 %

Explanation:

M(CH4) = 12+ 4*1 = 16 g/mol

M(O2) = 2*16 = 32 g/mol

M(CO2) = 12 + 2*16 = 44 g/mol

8.50 g * 1 mol/16 g = 0.5313 mol CH4

15.9 g * 1 mol/32 g = 0.4969 mol O2

9.77 g * 1 mol/44 g = 0.2220 mol CO2

1)                                  CH4        + 2O2 -----> CO2 + 2H2O

from reaction             1 mol          2 mol

given                       0.5313 mol   (0.4969 mol)

1 mol CH4              --- 2 mol O2

0.5313 mol  CH4  --- x mol O2

x= 2*0.5313 = 1.0626 mol O2

We can see that for given amount of CH4 we do not have enough O2, so O2 is a limiting reactant.

2)                               CH4        + 2O2 -----> CO2 + 2H2O

from reaction                             2 mol        1 mol

given                                      0.4969 mol   x mol

x = 0.4969*1/2 = 0.2485 mol CO2 theoretical yield

3)

Practical yield CO2 = 0.2220 mol

Theoretical yield CO2 = 0.2485 mol

% yield = (0.2220/0.2485)*100% = 89.3 %

Answer:

The Nitric Acid Test

Explanation:

The Nitric Acid Test is used to check if silver is pure or plated. To do so, file a small part of the item in a discreet area where it cannot be seen. Apply a few drops of nitric acid. If the area turns into creamy white, the silver is pure or sterling. If green, it is probably fake or silver-plated.

(ANSWER)

AREA OF WALK = 444 SQUARE FEE

(EXPLANATION)

FIRST, CALCULATE THE AREA OF THE RECTANGULAR YARD.

♥ A = L × W where A equals area, L equals length, and W equals width.

ACCORDING TO YOUR STATED PROBLEM:

♥ A = 1519 square feet. <––– Area of Rectangular yard.

♥ NOW, ACCORDING TO YOUR STATED PROBLEM THERE IS A WALK THAT IS 3 FEET WIDE GOING ALL THE WAY ALONG THE FENCE (INSIDE).

♥ THEREFORE, YOU HAVE SIX FEET TO SUBTRACT FROM EACH OF THE VALUES ABOVE (31) AND (49).

WHY?

THREE FEET ON EACH SIDE, CORRECT?

A = L × W

A = 25 × 43

A = 1075 square feet <––––Area of new rectangle formed by allowing for three foot walk.

♥ NOW, SUBTRACT THE AREA OF THE NEW RECTANGLE FORMED FROM THE AREA OF THE ORIGINAL AREA. DOING SO, WILL GIVE YOU THE AREA OF THE WALK, CORRECT?

♥ ORIGINAL AREA = 1519 square feet

♥ NEW AREA = 1075 square feet

_____________________________________

Answer:

It's water.

Explanation:

Water is also called as universal solvent, because it's literally almost the only one we use.

Sorry if I spelled something wrong. I'm Dominican so yeah . I hope this helps you :)

We know that the molar mass of ammonia is 17.03 grams per mole. This means that 1 mole of ammonia will have a mass of 17.03 grams.

The mole concept is a convenient method of expressing the amount of a substance. Any measurement can be broken down into two parts – the numerical magnitude and the units that the magnitude is expressed in. We are given that we have a 2.00 mole sample of ammonia. This means that we have 2 times the amount of ammonia that we would have in a 1.00 mole sample.

To find the mass of our sample, we need to multiply the number of moles by the molar mass. This gives us :-

2.00 moles * 17.03 grams/mole = 34.06 grams

Therefore, our sample of ammonia has a mass of 34.06 grams.

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Charlotte, driving at 60.2 mi/h, would travel approximately 344 feet during the 3.91 seconds that she looked at her phone.

To find out how far Charlotte traveled, we can first convert her speed to feet per second since we're given the time she looked at her phone in seconds. We know that 1 mile is approximately 5280 feet, so Charlotte's speed in feet per second is 60.2 miles per hour multiplied by 5280 feet over 3600 seconds (the number of seconds in an hour). This comes out to be approximately 88 feet per second.

Therefore, in the 3.91 seconds that Charlotte looked at her phone, she would've traveled 88 feet per second times 3.91 seconds, which equals roughly 344 feet.

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Answer:

the answer is D

Explanation:

because I had a test that had this question and I got it correct

In one mole of sodium carbonate, there are 2 moles of sodium , 6 moles of oxygen and 1 mole of C. Hence, in 1.25 moles of the compound, 2.5 moles of Na, 7.5 moles of O and 1.25 moles of C.

The molar mass of a compound  is the mass of one mole of the compound. One mole of any compound contains 6.02 × 10²³ atoms. This number is called Avogadro number.

2.  Convert 2.50 mol of Na2CO3 to mass in g.

Molar mass of sodium carbonate  = 106 g/mol

then, mass of 2.50 mol = 265 g.

3. Convert 5.50 g of Na2CO3 to mol.

Number of moles in 5.50 g of sodium carbonate = 5.50 g/ 106 = 0.051 moles.

4.Covert 5.50 g of Na2CO3 to number of particles

Now, one mole of sodium carbonate contains Avogadro number of atoms or molecules . Then number of particles in 5.50 g that is 0.051 moles is:

0.051 × 6.022 × 10²³ = 3.072 × 10²² particles.

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The [OH-] of the 0.025 M weak acid solution will be equal to the pKA of the acid, 4.615.
What is weak acid solution?
A weak acid solution is a solution that contains an acid that is not completely ionized in water. Weak acids, such as acetic acid, have pH values between 4.5 and 6.0. These acids are not strong enough to completely break apart in water, leaving some of the molecules still intact. Because of this, weak acids form molecules that can react with other molecules, such as bases, in solution.
This is because the equilibrium of the acid dissociation reaction is reached with the same concentration of acid and its conjugate base in solution. The [H3O] will be equal to 0.025 M, as the acid is in dissociation equilibrium with its conjugate base. The pH of the solution can be calculated by taking the negative log of the [H3O], which will be 1.59. The pOH can be calculated by taking the negative log of the [OH-], which will be 4.615.
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The complete string representing the order of orbital filling without blank spaces is: \(1s^22s^22p^63s^23p^64s^23d^1{0}4p^65s^24d^105p^66s^24f^145d^{10}6p^67s^25f^146d^{10}7p^6\)

To express the order of orbital filling as a string without blank spaces, we follow the Aufbau principle, which states that electrons fill orbitals starting from the lowest energy level and move upward. The order of orbital filling is as follows:\(1s^22s^22p^63s^23p^64s^23d^1{0}4p^65s^24d^105p^66s^24f^145d^{10}6p^67s^25f^146d^{10}7p^6\)

Let's break it down step by step:

1s^2: The 1s orbital can hold up to 2 electrons.

2s^2: The 2s orbital can also hold up to 2 electrons.

2p^6: The 2p orbitals can hold up to 6 electrons.

3s^2: The 3s orbital can hold up to 2 electrons.

3p^6: The 3p orbitals can hold up to 6 electrons.

4s^2: The 4s orbital can hold up to 2 electrons.

3d^10: The 3d orbitals can hold up to 10 electrons.

4p^6: The 4p orbitals can hold up to 6 electrons.

5s^2: The 5s orbital can hold up to 2 electrons.

4d^10: The 4d orbitals can hold up to 10 electrons.

5p^6: The 5p orbitals can hold up to 6 electrons.

6s^2: The 6s orbital can hold up to 2 electrons.4f^14:

The 4f orbitals can hold up to 14 electrons.

5d^10: The 5d orbitals can hold up to 10 electrons.

6p^6: The 6p orbitals can hold up to 6 electrons.

7s^2: The 7s orbital can hold up to 2 electrons.

5f^14: The 5f orbitals can hold up to 14 electrons.

6d^10: The 6d orbitals can hold up to 10 electrons.

7p^6: The 7p orbitals can hold up to 6 electrons.

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According to the laws of thermodynamics, energy will remain constant in a system, therefore energy will not be created or destroed but it will be transformed, remaining constant. Letter B

The answer is c. 8 electrons are in bromine's next to outer shell (n = 3). Therefore, the answer is c. 8 electrons are in bromine's next to outer shell (n = 3).

Bromine has an atomic number of 35, which means it has 35 protons in its nucleus and 35 electrons in its electron cloud. To determine the number of electrons in bromine's next to outer shell (n = 3), we need to look at the electron configuration of bromine. The electron configuration of bromine is: 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p5

The electrons in the outermost shell (n = 4) are the valence electrons, which are involved in chemical reactions. However, we are interested in the electrons in the next to outer shell (n = 3), which are also important in determining chemical properties. To determine the number of electrons in the next to outer shell, we need to subtract the number of electrons in the outermost shell (n = 4) from the total number of electrons in the atom.

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The amount of concentrated solution needed is (0.286 M)(65 mL) / C M, and the amount of water needed is 65 mL minus the volume of the concentrated solution.

To calculate the molarity of Kool Aid desired, we need to determine the number of moles of Kool Aid powder and sugar in the package. Since the molecular formula for sugar is C12H22O11, we can calculate its molar mass as follows:

Molar mass of C12H22O11 = (12 * 12.01) + (22 * 1.01) + (11 * 16.00)

= 144.12 + 22.22 + 176.00

= 342.34 g/mol

Given that the package contains 4.25 grams of Kool Aid powder, we can calculate the number of moles of Kool Aid powder using its molar mass:

Number of moles of Kool Aid powder = Mass / Molar mass

= 4.25 g / 342.34 g/mol

≈ 0.0124 mol

Similarly, for the sugar, which has a molar mass of 342.34 g/mol, we can calculate the number of moles of sugar using its mass:

Number of moles of sugar = Mass / Molar mass

= 192.00 g / 342.34 g/mol

≈ 0.5612 mol

Now, to calculate the molarity of the desired Kool Aid solution, we need to determine the volume of water. Given that 1.06 quarts is equal to 1 liter, and we have 2.00 quarts of water, we can convert it to liters as follows:

Volume of water = 2.00 quarts * (1.06 liters / 1 quart)

= 2.12 liters

To find the molarity, we use the formula:

Molarity (M) = Number of moles / Volume (in liters)

Molarity of Kool Aid desired = (0.0124 mol + 0.5612 mol) / 2.12 L

≈ 0.286 M

To prepare 65 mL of the desired molarity, we can use dilution calculations. We need to determine the volume of concentrated solution and the volume of water needed.

Let's assume the concentration of the concentrated Kool Aid solution is C M. Using the dilution formula:

(C1)(V1) = (C2)(V2)where C1 is the initial concentration, V1 is the initial volume, C2 is the final concentration, and V2 is the final volume.

Given that C1 = C M and V1 = V mL, and we want to prepare a final volume of 65 mL (V2 = 65 mL) with a final concentration of 0.286 M (C2 = 0.286 M), we can rearrange the formula to solve for the volume of the concentrated solution:

(C M)(V mL) = (0.286 M)(65 mL)

V mL = (0.286 M)(65 mL) / C M

So, the amount of concentrated solution needed is (0.286 M)(65 mL) / C M, and the amount of water needed is 65 mL minus the volume of the concentrated solution.

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The element with the greatest number of nonbonding pairs of electrons is He, as it has a full valence shell and does not need to form any bonds to fulfill the octet rule.

It seems you are asking about nonbonding pairs of electrons among the elements C (Carbon), H (Hydrogen), He (Helium), and F (Fluorine). Nonbonding pairs, also known as lone pairs, are valence electrons not involved in bonding.
In this case, Fluorine (F) has the greatest number of nonbonding pairs of electrons. Fluorine has 7 valence electrons, and when it forms a bond, it typically forms a single bond, using one electron for bonding. This leaves 6 electrons (3 pairs) as nonbonding pairs. In comparison, Carbon and Hydrogen typically form bonds with all of their valence electrons, and Helium has only 2 electrons in its outer shell which are not involved in bonding but do not form pairs.

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Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 0.98grams are present in  45.73 moles of  BCl\(_3\).

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.

Mathematically,

number of moles of  BCl\(_3\) =given mass of BCl\(_3\) ÷ molar mass of BCl\(_3\)

Molar mass of 1 mole of BCl\(_3\) = 46.264 g/mol

number of moles of  BCl\(_3\) = 45.73 moles

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

45.73 moles =mass of BCl\(_3\)÷46.264 g/mol

mass of BCl\(_3\)   =0.98grams

Therefore, 0.98grams are present in  45.73 moles of  BCl\(_3\).

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Answer:

The correct answer would be B.

Hope this helps :D

The spatial, temporal, and seasonal distribution of rainfall is referred to as a rainfall pattern. More rain falls in the tropics than in deserts.

Rain does not fall in colder places, such as the poles, since it is converted to snow before it reaches the ground. Mountain barriers have a substantial impact on air mass modification. and the distribution of precipitation is influenced by topography. Rising air on Hawaii's Big Island causes the leeward side of the mountains to be dry while the windward side is covered with rain.

The Orographic Effect is what we refer to as. The modification of air masses is significantly influenced by mountain barriers, and the distribution of precipitation is influenced by topography. Rising air on Hawaii's Big Island causes the leeward side of the mountains to be dry while the windward side is covered with rain.

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The amount of quarts in 2.50 L is 2.65 qt

Since the teacher prepares 2.50 liters of salt solution for a class experiment, we require how many quarts there are in 2.50 liters.

Since we know that 1 L = 1.06 qt, converting liters to quarts, we have

2.50 L = 2.50 × 1 L

= 2.50 × 1.06 qt

= 2.65 qt

So, the amount of quarts in 2.50 L is 2.65 qt

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Answer:

In Mendeleev's table, each period contains eight elements, and then the pattern repeats in the next row

Explanation:

this should be it

In a titration, acetic acid is used as the analyte and sodium hydroxide is used as the titrant. At the equivalence point,  ph be higher than 7.

The equivalence point of the titration is that point at which enough titrant has been added to react with all of the substance being titrated. A strong acid with a weak base gives a slightly acidic salt. Likewise, a strong base with weak acid gives slightly basic salt.

When acetic acid react with NaOH then a salt sodium acetate and water is formed. Acetic acid, CH3COOH react with sodium hydroxide, to produce sodium acetate, CH3COONa and water

CH3COO- + H2O ---> CH3COOH + OH-

This reaction of the acetate ion makes the ph greater than 7.

At the equivalence point, moles of acetic acid is equal to the moles of sodium hydroxide. The solution will turn pink as more of sodium hydroxide is added.

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A reaction's rate constant rises from 10.0 to 100. when the temperature rises from 300°C to 400°C 45.6 kJ/mol is the activation energy.

The activation energy for the reaction can be calculated using the Arrhenius equation, which relates the rate constant to the activation energy and the temperature. The Arrhenius equation is: k = A * e^(-Ea/RT). Where k is the rate constant, A is the pre-exponential factor, Ea is the activation energy, R is the gas constant, and T is the temperature. By rearranging the equation to solve for Ea, we get: Ea = -RT * ln(k/A)We know that k1 = 10.0 s^-1 at T1 = 300 K, and k2 = 100. s^-1 at T2 = 400 K. We can use these values to calculate the activation energy: Ea = -(8.314 J/mol*K) * (400 K - 300 K) * ln(100/10)=Ea ≈ 45.6 kJ/mol.

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Answer:

a  big rock

Explanation:

Answer:

Explanation:

the equation is d=m/v

convert cm to m

97.3*100=9730m^3

d=1880g/9730cm^3

d=0.19g/m^3

Gravity, as a fundamental force of nature, is influenced by several factors. The following are some of the key factors affecting gravity:

Answer:

The atomic number on the Periodic Table will tell you how many protons are in the nucleus of each atom.

Explanation:

number of electrons and protons should be equal in a neutral atom. Because each electron has a -1 charge, and each proton a +1 charge, the number of each must be the same for the net charge to equal zero.

Answer:

23.8g

Explanation :

Convert 2.0M into mol using mol= concentration x volume

2.0M x 0.1L (convert 100mL to L since the units for M is mol/L)

= 0.2 mol

We can now find grams by using the molar mass of KBr

=119.023 g/mol (Found online) webqc.org

but can be be calculated by using the molecular weight of K and Br found on the periodic table

We can now calculate the grams by using grams=mol x molar mass

119.023g/mol x 0.2mol

= 23.8046 g

=23.8g (rounded to 1decimal place)

Answer:

The Law of Conservation of Mass dates from Antoine Lavoisier's 1789 discovery that mass is neither created nor destroyed in chemical reactions. In other words, the mass of any one element at the beginning of a reaction will equal the mass of that element at the end of the reaction.

Explanation:

yw <3

Answer:

energy cannot be created or destroyed. it is instead transferred from one form to another

Explanation: