A cup of coffee contains 87.2 mg of caffeine. how many grams is this?

Answer:

False

Explanation:

Substances are of two types: Pure substances and mixtures. Pure substances include elements (made up of single kind of atoms), compounds (atoms of different element in fixed proportion). Substances are of three types: elements, compounds and mixtures.

Given,

Specific heat capacity of lead = 0.128 J/g

Specific heat capacity of magnesium= 1.024 J/g

Molar heat capacity is the amount of heat needed to raise the temperature of 1 mole of a substance by 1 unit.

So,

For calculating molar heat capacity we need to multiply the specific heat capacities of the metals with their atomic masses.

Atomic mass of lead (Pb) = 207

Atomic mass of magnesium (Mg) = 24

∴ Molar heat capacity = specific heat capacity x atomic mass

Molar heat capacity of Pb=0.128 x 207 = 26.5 J

Molar heat capacity of magnesium (Mg) = 1.024 x 24 = 24.5

Hence , molar heat capacities of lead and magnesium are 26.5 and 25.5 Joules respectively.

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Molar heat capacities of lead and magnesium is 26.49 and 24.5 Joules, respectively.

Given,

Lead has a specific heat capacity of 0.128 J/g.

Magnesium has a specific heat capacity of 1.024 J/g.

The quantity of heat required to increase the temperature of 1 mole of a substance by 1 unit is known as its molar heat capacity.

So, We must multiply the specific heat capacities of the metals by their atomic masses in order to determine their molar heat capacities.

Lead (Pb) has an atomic mass of 207.

Magnesium (Mg) has an atomic mass of 24.

Specific heat capacity multiplied by atomic mass gives the molar heat capacity.

Pb has a 26.5 J molar heat capacity (0.128 x 207).

Magnesium's (Mg) molar heat capacity is equal to 1.024 x 24.

Thus, lead and magnesium have molar heat capacities of 26.49 and 24.5 Joules, respectively.

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25% weight-to-weight acetic acid solution has a molar fraction of 4.375 M.

What is molar fraction?

The mole fraction is one of many ways to indicate the concentration of the solution. A mole fraction is a unit of concentration. The ratio of solute to solvent in a solution is measured using a unit called the mole fraction, which is symbolised by the letter "X."

X is a molar fraction representation. The mole fraction is defined as: moles of solute/total moles of solvent if the solution contains only components A and B. As a result, the mole fraction of each component added together is always equal to one.

The fact that the acetic acid is specified as 25% should be noted.

1.05 kg/L or 1.05 g/ml of solution density is equal to d.

Given the density, the molar fraction of a 25% weight-averaged acetic acid solution will be:

M = 25 × 1.05 × 10/60

= 4.375 M

Therefore, 4.375 M is the molar fraction of a 25% weight-to-weight acetic acid solution.

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The mass of hydrogen that is needed to produce 5.0 g of tungsten is 0.0273 grams.

Tungsten is a chemical element that is used with steel to make the steel strong.

The equation:

WO₃ + 3H₂ --> 3H₂O + W

Given, that the mass is 5.0 g of tungsten

The molar mass of tungsten is 183.84 g/mol

Moles = mass / molar mass

5.0 / 183.84 = 0.0271 moles

Then, the Mass of hydrogen

The molar mass of hydrogen is 1.00784

Moles of tungsten are 0.0271 moles

molar mass x moles

1.00784 x 0.0271 moles

0.0273

Thus, the mass of hydrogen needed is 0.0273 grams.

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Answer:

Oxygen has more protons than hydrogen and water's shared electrons are drawn to it.

Explanation:

The equilibrium solubility of Ca (So3)2 is

Ca (So3)2 ⇋⇋ Ca2 + 2(SO3)

The Ksp (Solubility product) expression looks like this:

Ksp = [Ca2+] [SO3-]2

Ca (So3)2 generates 1 mol of Ca2+ whereas 2 mol of SO3– per mol.

[Ca2+] = 1.18*10^-4 M

[I–] = (2) × 1.18*10^-4 M

So, [I–] = 2.36 × 10^-4M

On Replacing these values in the Ksp equation.

Ksp = (1.18*10^-4M) (2.36 × 10^-4M)2

So, Ksp = 2.7848 x 10^-8 M2

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An acidic solution has a ph value of 0 - 6, a neutral solution has a ph value of 7, and a basic (alkaline) solution has a ph value of 8 - 14.

According to Arrhenius, an acid is a substance that releases hydroxonium ion (H3O+) as its only positive ion when dissolved in water. In other words, they are proton donors. They also turn litmus paper red, have a wet feeling and a sour taste.

A base is a substance that releases hydroxide ion (OH-) as its only negative ion when dissolved in water, according to Arrhenius. They are proton acceptors and turn litmus paper blue. They have a slippery feeling and a bitter taste.

To determine whether a solution is acidic or basic, ph indicators like litmus paper, phenolphthalein and methyl orange are used, but they do not give an exact ph value. To specifically know how acidic or basic a solution is, the ph scale is used. It comprises of a range of numbers from 0 - 14, with 0 being the most acidic and 14 being the most basic. Neutral substances like water have ph value of 7. Acidic solutions have a ph range from 0 - 6, while basic solutions have ph values from 8 - 14.

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The number of neutrons present in the nucleus of an average atom in any given element is best estimated by subtracting the number of protons from the mass number.

All atoms contain protons, neutrons and electrons, although the amount differs for each atom. Neutrons are located in the nucleus of each atom. They were first discovered by James Chadwick. They are also neutral and have no charge.

Apart from neutrons, positively charged protons are present in the nucleus. The number of protons is equal to the atomic number, usually denoted with the letter Z.

The mass number or atomic mass is the total mass of the atom. It is calculated by adding the number of protons to the number of neutrons. Electrons are really light and have negligible mass (about 1/1840 times the mass of a proton), so we don't add their masses when calculating mass number. So, to get the number of neutrons in an atom, subtract the number of protons from the mass number.

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Answer:

3.63 g/mL (3 s.f.)

Explanation:

Density is the amount of substance per unit volume, and can be calculated by dividing the mass by the volume.

Given: mass= 59.6 g, volume= 16.4 mL

Density of block

= 59.6 ÷16.4

= 3.63 g/mL (3 s.f.)

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Answer:

The density calculator will help you estimate the relationship between the weight and volume of an object.

Explanation:

Answer:

Its a element

Explanation:

Boron is made of atoms.

Answer:

element is the answer for your question

Explanation:

because i took a test on this

The kinetic energy is 0.5177 × 10⁻²¹ J more at 50°C compared to 25°C.

The average kinetic energy of a molecule is directly proportional to the absolute temperature of a gas.

KE = ( 3/2 ) ( R / Nₐ ) T

Where T is the temperature of the molecule, R is the gas constant, and Nₐ is Avogadro's number.

Now, R = 8.314 J/mol.K

Avogadro's number, Nₐ = 6.022 × 10²³ atoms/ mol

The average kinetic energy at 50° C is:

T = 50° C = 323 K

KE₁ = ( 3/2 ) × ( R / Nₐ ) × T₁

KE₁ = ( 3 × 8.314 × 323 ) / ( 2 × 6.022 × 10²³ )

KE₁ = 668.90 × 10⁻²³ J

KE₁ = 6.6890 × 10⁻²¹ J

The average kinetic energy at 25°C is:

KE₂ = ( 3/2 ) × ( R / Nₐ ) × T₂

KE₂ = ( 3 × 8.314 × 298 ) / ( 2 × 6.022 × 10²³ )

KE₂ = 617.13 × 10⁻²³ J

KE₂ = 6.1713 × 10⁻²¹ J

Now,

The average kinetic energy of the molecules at 50° C compared to 25° C is:

KE = KE₁ - KE₂

KE = 6.6890 × 10⁻²¹ - 6.1713 × 10⁻²¹

KE = 0.5177 × 10⁻²¹ J

Hence, the average kinetic energy is 0.5177 × 10⁻²¹ J more at 50° C compared to 25° C.

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At 30°C, Molar enthalpy will be 72,446.4 J/mole and total enthalpy will be 26.5 kJ.

At 50°C, Molar enthalpy will be 3,63,792J/mole and total enthalpy will be 132.5 kJ.

The enthalpy value per mole is known as molecular enthalpy. Enthalpy is a thermodynamic quantity that, according to this definition, is equivalent to a system's entire heat capacity. It is equal to the sum of the system's internal energy and the volume times pressure product. KJ/mol serves as the unit of measurement for this value. As a result, we can arrive at the following equation to determine molar enthalpy:

DH/n = Molar Enthalpy n is the number of moles of reactant used in the system, and DH is the change in enthalpy of the system. For instance, the change in enthalpy when one mole of a chemical species is created in the standard state at a certain temperature is known as the molar enthalpy for the creation of a specific substance.

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Answer:

The flame of the candle looks to go out, but the candle continues to burn. In actuality, the copper wire coil is transferring heat away from the candle flame. The flame returns after the coil of wire is removed.

Explanation:

An barium, group 2A family atom has an atomic number of 56

Barium is a chemical element with the symbol Ba and atomic number 56 it is fifth element in group two and is a soft, silvery alkaline earth metal because of its high chemical reactivity, barium is never found in the nature as a free element, element symbol are Ba and when  If it has a charge of 1+ then barium has 56 electron then 56-1=55 electron are present barium are present in group 2A in the periodic table and called alkaline earth metal

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Answer: created, destroyed, element, product

Explanation: The law of conservation of mass states that matter can neither be created nor destroyed but is transferred from one form to another. In other words, the mass of one element at the beginning of the reaction must be equal to the mass of the element at the end of the reaction.
So...the law of conservation of mass states that during a chemical reaction, mass/matter is not CREATED or DESTROYED and because of this law, there must be exactly the same number and kind of ELEMENTS on each side of a chemical equation.
To check if an equation is balanced or not, simply count the number of atoms of each element on the reactant side of the equation and check to see if there are the same number of atoms of each element on the PRODUCT side of the equation. If so, it is balanced.

Due to the hydrogen bonding between the molecules of ethanol and water, it is True.

Water and ethanol form weak hydrogen bonds with aromatic hydrogen atoms and strong hydrogen bonds with the hydroxyl, carbonyl, and ether groups in chrysin/galangin. Although less frequently than in water, ethanol molecules can form hydrogen bonds with one another. The fact that there is only one hydrogen with a significant Positive charge in each ethanol molecule limits the hydrogen bonding. Between adjoining hydrogen and oxygen atoms of nearby water molecules, hydrogen bonds are formed. A bond called a hydrogen bond is produced by the attraction between individual water molecules.

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Answer:

151 g SO₂ × [1 mol SO₂/64.06 g SO₂] = 2.36 mol SO₂

Explanation:

The byproduct of fermentation tha induces the coagulation of casein into the cheese curd is b. lactic acid.

Lactic acid causes the milk proteins casein to form into a cheese curd, because it increase acidity and the enzymes prefer for the coagulation.

Producing cheese curds is one of the first steps of makint a cheese.

Swiss cheese is a cheese made in Switzerland.

Swiss cheese is, usually, a semihard cheese made from cows milk with a characteristic holes.

Fermentation of milk is a metabolic process in which lactic acid (CH₃CHOHCOOH) and carbon dioxide are produced from sugar lactose:

C₅H₁₂O₆ → CH₃CHOHCOOH + C₂H₅OH + CO₂

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The amount of energy that must be absorbed or lost to raise or lower the temperature of 1 gram of liquid water by 1°C is 1 calorie.

A calorie (cal), or a small calorie, is the amount of energy needed to heat one gram of water by one degree Celsius. It is used to express the amount of energy released in a phase change or chemical reaction.

One small calorie is approximately 4.2 joules.

A calorie is a unit of energy.

A calorie was originally part of the metric system (SI), but now it is replaced with the joule (J).

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The electrons will take 7.3 times to be equal to the mass of the helium nucleus

If we want to calculate the number of electrons in the nucleus of the helium, then we have the formula for finding the number of electrons so by doing so we can get exactly the number of electrons.

The formula is that if we divide the total mass of the nucleus of the helium gas with the number of electronic mass so it will give us the number. So as a result it will take $7.28869 \times {10^{ - 59}}$ number of electrons to equal the mass of a helium nucleus.

The atomic mass of the Helium is 4.002602.

So we can conclude that the electrons will take 7.3 times to be equal to the mass of the helium nucleus.

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Answer:

A non-carbonated soft drink is a homogenous mixture or a solution

Explanation:

Non-carbonated soft drinks contains water, sweetener that are evenly mixed (or uniformly mixed if this is the reagents). And since we don't see and bubbles when it's in the drink the soft drink is a solution because the components are evenly mixed.

Initial main byproducts of the reaction between concentrated hydro iodic acid and benzyl isopropyl ether are isopropyl alcohol and benzyliodide.

What are ethers?

Any organic compound in the family known as ethers has an oxygen atom bound to two alkyl or aryl groups. Ethers and alcohols share structural similarities, and water shares structural similarities with both ethers and alcohols. While both hydrogen atoms are replaced by alkyl or aryl groups in an ether, just one hydrogen atom of a water molecule is replaced by an alkyl group in an alcohol.

Thus, Initial main byproducts of the reaction between concentrated hydro iodic acid and benzyl isopropyl ether are isopropyl alcohol and benzyliodide.

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Volume is the correct answer

Answer:

k

Explanation:

k7

Answer:video camera

Explanation:

It avoids the need to make tedious, and uncertain, calculations to estimate the shell-side coefficient.

In steady flow systems, tube-side heat transfer coefficients are capable of being greatly improved over flow at the same net flow Reynolds number. The Nusselt values converge, as shown in Figure 5.21, at higher Reynolds numbers, although operation at such high net flow Reynolds numbers would negate the benefits of adopting OBRs in the design. Nu is often increased by a factor of between 10 and 30 in the lower Re region.

Due to the improved radial transport exhibited by the vertical mixing patterns, this improvement has occurred. It is obvious that in an oscillating baffled system, heat transfer coefficients that are comparable to those of smooth-walled tubes under well-developed turbulence can be attained at significantly lower (net flow) Reynolds numbers.

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Water is added to vinegar, which already contains acetic acid, to dilute it while keeping the same number of moles in the acid solution.

This makes it easy to determine the titration's end point, which helps ensure appropriate titration and accurate results.

Since the number of acid moles in the solution does not vary with the addition of water, the additional volume caused by the addition of water is not taken into account in the calculations.

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It is because the traditional definition of a strong acid is based on the simplicity of proton (hydrogen ion) donation in aqueous solution.

The chemical compound phosphorus pentoxide has the molecular formula P4O10 (with its common name derived from its empirical formula, P2O5). The anhydride of phosphoric acid is this white, crystalline solid. When P2O5 is dissolved in water, it produces H3PO4, or phosphoric acid (3H2O + P2O5 2H3PO4).

Phosphorus pentoxide has a molecular formula of P4O10, but its empirical formula is P2O5. But the name of the compound, not its molecular formula, was derived from its empirical formula. The official name for all of this substance is diphosphorus pentoxide.

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Explanation:

 It drowns out some of the more delicate notes. It changes the flavour balance.