A student measures the mass and volume of a small cube made of an unknown metal. The mass of the cube is 25.0 g, and the volume of the cube is 3.19 cm³. The student is told that the cube is a sample of one of the four materials listed in the table. based on the Data given, the unknown material is most likely A gold Density 19.39, B iron Density 7.85, C silver Density 10.50 D tin density 7.28

The total kilojoules in two tablespoons is  836.8 kJ.

To determine the total kilojoules in two tablespoons of a substance, we need to know the specific substance and its energy content per tablespoon. Different substances have different energy values, so without this information, it is not possible to provide an accurate calculation.

The energy content of food or substances is typically measured in kilocalories (kcal) or kilojoules (kJ). 1 kilocalorie is equal to 4.184 kilojoules. The energy content of a substance is often listed on food labels or in nutritional databases.

For example, if we have the energy content of a substance as 100 kilocalories (kcal) per tablespoon, we can convert it to kilojoules by multiplying it by 4.184:

100 kcal * 4.184 kJ/kcal = 418.4 kJ

So, if we have two tablespoons of this substance, the total energy would be:

418.4 kJ/tablespoon * 2 tablespoons = 836.8 kJ

It's important to note that the energy content of a substance can vary depending on its composition, density, and other factors. Therefore, it is always recommended to refer to reliable sources such as food labels, nutritional databases, or consult a qualified professional to obtain accurate information regarding the energy content of specific substances.

For more such information on: kilojoules

https://brainly.com/question/29497478

#SPJ8

The mass of the platinum ring is 76.0 grams.

We need to know the molar mass of platinum and the number of platinum atoms in the ring.

The molar mass of platinum (Pt) is 195.08 g/mol.

The number of platinum atoms in the ring is 2.35×10^23.

Now we can use the following formula to calculate the mass of the ring:

mass = (number of atoms) x (atomic mass) / Avogadro's number

where Avogadro's number is 6.022 x 10^23 mol^-1.

Substituting the values:

mass = (2.35×10^23 atoms) x (195.08 g/mol) / (6.022 x 10^23 mol^-1)

mass = 76.0 g

Therefore, the mass of the platinum ring is 76.0 grams.

Learn more about molar mass here : brainly.com/question/30459977

#SPJ1

It is difficult to estimate the exact number of atoms in a human body because number can vary greatly depending on a person's size and body composition. However, we can make an estimate based on the average mass of the human body and average atomic masses of the most common elements in the body.

The most common elements in the human body are oxygen, carbon, hydrogen, nitrogen, calcium, and phosphorus. These elements make up approximately 99% of the total body mass.

Using the average atomic masses of these elements and assuming a body mass of 70 kg, we can estimate the number of atoms as follows:

Oxygen: approximately 25 kg, or 3.5 × 10⁻²⁶ atoms.

Carbon: approximately 18 kg, or 2.5 × 10⁻²⁶ atoms.

Hydrogen: approximately 10 kg, or 1.4 × 10⁻²⁶ atoms.

Nitrogen: approximately 3 kg, or 4.2 × 10⁻²⁵ atoms.

Calcium: approximately 1.5 kg, or 2.1 × 10⁻²⁵  atoms.

Phosphorus: approximately 0.8 kg, or 1.1 × 10⁻²⁵ atoms.

So, the total number of atoms in a 70 kg human body would be approximately 10⁻²⁷  to 10⁻²⁸ atoms.

The exact number of atoms in a human body can vary greatly depending on a number of factors, including age, body composition, and overall health.

To know more about atoms here

https://brainly.com/question/29695801

#SPJ4

Explanation:

First, we need to calculate the molarity of both solutions. The solution with higher molarity is more concentrated.

Solution A:

First, let's transform 50.0 g of CaCO3 into moles using n = m/MM

MM of CaCO3 = 100 g/mol

n = 50/100

n = 0.5 moles

M = n/V

n = 0.5 moles

V = 250 mL = 0.25 L

M = 0.5/0.25

M = 2 mol/L

Solution B:

M = n/V

M = 6/2

M = 3 mol/L

Solution B has a higher molarity than solution A, which means that solution B is more concentrated.

Answer: Solution B.

Answer:

B. PROTONS EXHIBIT STRONGER PULL ON OUTER f ORBITALS

Explanation:

Lanthanide contraction is the greater than normal decrease in the ionic radius of the lanthanide series from atomic number 57 to atomic number 71. This decrease is rather not expected of the ionic radii of these elements and they result in the greater decrease in the subsequent series of the lanthanides from the atomic number 72. The cause of which is as a result of the poor shielding effects of the nuclear charge around the electrons of the f orbitals. So therefore, protons are strongly pulled out of the 4f orbital and as a result of the poor shielding effect which causes the electrons of the 6s orbitals to be drawn more closer to the nucleus and hence resulting in a smaller atomic radii. It is worthy to note that the shielding effects of the inner electrons decreasing from s orbital to the f orbital; that is s > p > d > f. So from the decrease in the shielding effects from s to the f orbitals, lanthanide contraction results from the inability of the orbitals far away from s like the 4f orbiatls to shield the outermost shells of the lanthanide elements. So the cause of lanthanide contraction is the action of the protons which strongly pull the electrons of the f orbitals because of the poor shielding effects due to the distance of this orbital from the nucleus.

Answer:

B) Protons exhibit a stronger pull on outer f orbitals than on d orbitals.

Explanation:

Answer:

C6H12O2

Explanation:

The Jones reagent is a reagent in organic chemistry used to convert primary alcohols to carboxylic acids and secondary alcohols to ketones. Recall that tertiary alcohols can not be oxidized.

The compound  2-methyl-2,3-pentandiol contains one secondary and one tertiary alcohol. The secondary alcohol is oxidized to a ketone while the tertiary alcohol is not oxidized.

Hence the product of the oxidation using Jones reagent is 2-Hydroxy-2-methyl-3-pentanone with the molecular formula C6H12O2.

Answer:

Zn(NO3)2(aq) + 2NaOH(aq)  —> Zn(OH)2 (s) + 2NaNO3(aq)

Zn++ + 2NO3-  + 2Na+ + 2OH- —> Zn(OH)2 + 2Na+ + 2NO3-

Zn++ 2OH- —> Zn(OH)2

Na+, NO3-

Explanation:

Zn(NO3)2(aq) + 2NaOH(aq)  —> Zn(OH)2 (s) + 2NaNO3(aq)

The equilibrium constant Kc is the value that relates the molar concentrations of reactants and products. For a reaction with the following general balanced equation: aA+bB-->cC+dD, the value of the constant in equilibrium will be:

The square brackets represent the molar concentrations of the compounds.

Now, for this reaction we have 1 reactant and 1 product (aA--->cC), the equilibrium equation will then be:

If we replace the molar concentrations we will then have Kc:

Answer: The numerical value of Kc of the reaction is 1.2M

Explanation:

decrease T = eq shifts left, because youre taking energy from the system and this is an endothermic reaction, it needs energy to make products = co2 concentration decreases

add CO = eq shifts right, because you're adding reactants in the equilibrium = i2o5 concentration decreases

increase i2o5 = same = can't affect T

decrease co2 = eq shifts right, because by

decreasing co2 you'll have less of this product than you normally have in the equilibrium, then eq will shift toward making more product = both reactants, CO and I2O5 decrease their concentration because they're being used to shift equilibrium right

Answer:

Top answer:

The maximum mass of water (H₂O) produced from the reaction between

Explanation:

Gaseous methane ch4 will react with gaseous oxygen o2 to produce gaseous carbon dioxide co2 and gaseous water h2o . suppose 1.44 g of ...

Answer:

Therefore, the pressure of the gas at 273 K is approximately 0.312 atm.

Explanation:

To solve this problem, we can use the combined gas law, which relates the pressure, volume, and temperature of a gas:

(P1 × V1) / T1 = (P2 × V2) / T2

where P1, V1, and T1 are the initial pressure, volume, and temperature, and P2, V2, and T2 are the final pressure, volume, and temperature.

We are given the initial pressure P1 = 0.370 atm and the initial temperature T1 = 50.0°C = 323 K. We want to find the final pressure P2 at a temperature of T2 = 273 K.

We can rearrange the formula above to solve for P2:

P2 = (P1 × V1 × T2) / (V2 × T1)

Since the volume of the gas is not changing, we can simplify this to:

P2 = (P1 × T2) / T1

Substituting the given values, we get:

P2 = (0.370 atm × 273 K) / 323 K

Simplifying, we get:

P2 ≈ 0.312 atm

The mole fraction of the water solution is 0.77.

The mole fraction or molar fraction is defined as a unit of the quantity of a constituent, nᵢ, divided by the total quantity of all parts in a combination.

Moles of water = given mass/ molar mass

Moles of water = 84/18

Moles of water = 4.6

Moles of hexane =  given mass/ molar mass

Moles of hexane = 100/76

Moles of hexane = 1.3

Total moles = Moles of water + Moles of hexane

Total moles = 4.6 + 1.3 = 5.9

Mole fraction of water = Moles of water / Total moles

Mole fraction of water = 4.6/5.9

Mole fraction of water = 0.77

Hence, the Mole fraction of water is 0.77.

The mole fraction is the same as the mole percent however in a specific shape in chemistry. Inside the given combination, the range of moles of one constituent is divided by the total number of moles is referred to as the mole fraction. Multiplying the mole fraction of the thing by then we gain the mole percentage of the aspect.

Mole fraction is a unit of awareness, described to be equal to the range of moles of an aspect divided through the whole wide variety of moles of a solution. Because it's miles a ratio, the mole fraction is a unitless expression.

Learn more about mole fraction here:- https://brainly.com/question/1601411

#SPJ1

Answer:

No. of H atoms in 0.51 moles of H+ = 3.0713 * 10^23 atom

Explanation:

according to the definition of mole which states that the mole is the unit of amount of substance that equals Avogadro's number"Na = 6.022 * 10^23" (i.e. one mole of O2 contains 1Na of molecules, one mole of Ca = 1Na of atoms )

So

the number of atoms in 0.51 moles of H = 0.51 * 6.022 * 10^23 = 3.0713 * 10^23 atom

Answer:

Nutrients arw compounds in foods essential to life and heath

Answer: In simple terms nutrients are the energy that you get from food certain foods give more nutrients and others give close to none. That is what nutrients in your food is

Explanation:

Answer:

C.the temperature of the liquid increased.

Explanation:

Answer:

A. Rubidium and phosphorus react to form rubidium phosphide

Explanation:

P is not potassuim. It is phosporous. So A is the only correct choice.

Answer:

d. positron

that's the answer brainly tells me I need to write at least 20 characters and that's d u m b.

The ideal gas law and stoichiometry must be used to calculate the volume of carbon dioxide gas produced by the breakdown of 4.09 g of calcium carbonate at STP (Standard Temperature and Pressure).

Use the molar mass of calcium carbonate (CaCO3) to determine how many moles it contains. CaCO3 has a molar mass of 100.09 g/mol.

CaCO3 mass divided by its molar mass equals the number of moles of CaCO3: 4.09 g/100.09 g/mol.

The number of moles of carbon dioxide (CO2) generated may be calculated using the stoichiometric ratio from the balancing equation. By using the equation:

A unit of CaCO3 and CO2 is produced.

CO2 moles equal the same number of moles of CaCO3.

Use the ideal gas law to translate the volume of carbon dioxide into moles.

Learn more about  CaCO3  at :

https://brainly.com/question/29792038

#SPJ1

Answer:

It depends on how much the calories and fat there is in the meals and if you don't get enough physical activity of the same amount of food that you eat it can lead to weight gain

Explanation:

Answer: C

Explanation:

Answer:

convection is not form of energy

The number of grams of RbOH present in the solution can be found by using the formula

\(c = \frac{m}{M \times v} \\ \)

where

m is the mass in grams

M is the molar mass in g/mol

v is the volume in L or dm³

making m the subject we have

m = c × M × V

First of all we have to find the molar mass of RbOH

M(RbOH) = 85.5 + 16 + 1 = 102.5 g/mol

v = 31 ml = 0.031 dm³ or 0.031 L

c = 5.6 M

Substituting it into the formula we have

m = 5.6 × 102.5 × 0.031 = 17.79 g

We have the final answer as

Hope this helps you

Answer:

D = 5.27 g

Explanation:

The molar mass of Li2SO4 is 2·7 + 32  + 64 = 110

18 g Li2SO4 contains 18/110 = 0.1636 mole Li2SO4, or 0.32727 mol Li

This allows to prepare 0.1091 mol Li3P

1 mole Li3P weighs 3·7 + 31 = 52 g/mol

0.1091 mol Li3P weighs 52 g · 0.1091 =  5.27 g

The correct categorization of the solutions is:a. KCl - Neutral

b. ZnCl2 - Acidic

c. Ba(C2H3O2)2 - Basic

d. NH4I - Acidic

e. NaNO3 - Neutral

To determine whether a 0.5M solution of each salt is acidic, basic, or neutral, we need to analyze the nature of the ions present in the solution.

a. KCl: When KCl is dissolved in water, it dissociates into K+ and Cl- ions. Both K+ and Cl- are spectator ions and do not contribute to the acidity or basicity of the solution. Therefore, the solution is neutral.

b. ZnCl2: When ZnCl2 is dissolved in water, it dissociates into Zn2+ and 2Cl- ions. The presence of Zn2+ ions in the solution can hydrolyze water molecules, resulting in the formation of H+ ions. Therefore, the solution is acidic.

c. Ba(C2H3O2)2: When Ba(C2H3O2)2 is dissolved in water, it dissociates into Ba2+ and 2C2H3O2- ions. The acetate ions (C2H3O2-) can hydrolyze water, leading to the formation of OH- ions. Therefore, the solution is basic.

d. NH4I: When NH4I is dissolved in water, it dissociates into NH4+ and I- ions. The presence of NH4+ ions in the solution can undergo a weak hydrolysis, resulting in the formation of H+ ions. Therefore, the solution is acidic.

e. NaNO3: When NaNO3 is dissolved in water, it dissociates into Na+ and NO3- ions. Both Na+ and NO3- ions are spectator ions and do not contribute to the acidity or basicity of the solution. Therefore, the solution is neutral.

For more such questions on solutions visit:

https://brainly.com/question/25326161

#SPJ8

Answer: A

Explanation:

As one increases the other goes in a straight line.  It is called a direct proportionality.  Forms a linear graph.

The total gaseous mixture is 4.48 g.

The total gaseous mixture can be calculated using the ideal gas law: PV = nRT.

First, we need to convert the temperature to Kelvin: 27.0°C + 273.15 = 300.15 K.

Next, we can use the ideal gas law to calculate the number of moles of each gas:

For He: n = (1.12 atm) (2.00 L) / (0.08206 L·atm/mol·K) (300.15 K) = 0.0906 mol

For Ar: n = (4.53 g) / (39.95 g/mol) = 0.113 mol

The total number of moles of gas in the mixture is then:

n(total) = n(He) + n(Ar) = 0.0906 mol + 0.113 mol = 0.204 mol

Finally, we can calculate the total mass of the mixture:

m(total) = n(total) × M(avg)

where M(avg) is the average molar mass of the mixture, which can be calculated as:

M(avg) = (M(He) + M(Ar)) / 2 = (4.003 g/mol + 39.95 g/mol) / 2 = 21.98 g/mol

Thus,

m(total) = 0.204 mol × 21.98 g/mol = 4.48 g

Therefore, The total weight of the gaseous mixture is 4.48 g.

To know more about the Gaseous mixture, here

https://brainly.com/question/30966571

#SPJ1

Answer:

How many atoms are in a mole of silver?

From Avogadro's number, we know that one mole of silver atoms is equal to 6.02 times 10 to the 23rd silver atoms

Explanation:

Answer:

The energy changes form

Explanation:

As the Law of Conservation of energy states, energy can neither be crated nor destroyed. But, it can change form, whether that change is potential to kinetic or energy into heat or entropy, which is to us unusable as it is the energy of disorder.

Answer:u just answered your question

Explanation:

Osmosis is a special case of diffusion. Water, like other substances, moves from an area of higher concentration to one of lower concentration. ... In this example, the solute cannot diffuse through the membrane, but the water can. Water has a concentration gradient in this system.!!!!!!!!!!!!!!!!!!!!!!!!!