How many grams of Cu would be needed to react with 2.0 mol of HNO3?
3 Cu(s) + 8 HNO3(aq) --> 3 Cu(NO3)2(aq) + 2 NO(g) + 4 H20(1)

Answer:

0.00244g/cm³ (3 s.f.)

Explanation:

The formula of density is [tex]\frac{mass}{volume}[/tex]. We already know the mass is 28.6kg, so we need to find the volume first before calculating the density.

Volume of board = 5.54 cm × 10.6 cm × 199 cm

                            = 11 700 cm³ (3 s.f.)

Density of board = [tex]\frac{28.6}{11 700}[/tex]

                            = 0.00244g/cm³ (3 s.f.)

Answer:

d = 0.0024 g/cm³

Explanation:

Given data:

Density of board = ?

Volume = 5.54 cm× 10.6 cm× 199 cm

Mass of board = 28.6 g

Solution:

Formula:

d = m/v

d = density

m = mass

v = volume

Volume = 5.54 cm× 10.6 cm× 199 cm = 11686.1 cm³

d = 28.6 g/ 11686.1 cm³

d = 0.0024 g/cm³

Answer:

2LiO+2CL2

Explanation:

took the test

Answer:

It's A. 2LiCl + 3O2

Explanation:

Process of elimination babyyyyy

Answer:

A 65-kg object and an 75-kg object.

Explanation:

The gravitational force is given by :

[tex]F=G\dfrac{m_1m_2}{r^2}[/tex]

F is directly proportional to the product of masses and inversely to the distance between them.

In this problem, the distance separating the objects is same for each pair. We need to find the greatest gravitational force between them.

(1) a 50-kg object and an 80-kg object

[tex]F_1=G\dfrac{4000}{r^2}\ N[/tex]

(2) a 65-kg object and an 65-kg object

[tex]F_2=G\dfrac{4225}{r^2}\ N[/tex]

(3) a 65-kg object and an 75-kg object

[tex]F_3=G\dfrac{4875}{r^2}\ N[/tex]

(4) a 60-kg object and an 70-kg object

[tex]F_4=G\dfrac{4200}{r^2}\ N[/tex]

From the above calculations we find that if the product of masses is maximum, it lead to maximum gravitational force between objects. Hence, a 65-kg object and an 75-kg object will have maximum gravitational force between them.

Answer:c

Explanation:

A negative Gibbs free-energy value is an indication of a spontaneous reaction. This means that the reaction will occur without the need for any external energy input and will release energy that can be used to drive other processes. The correct answer is option c.

Gibbs free energy is a thermodynamic quantity that describes the amount of energy available to do work in a system. It takes into account both the enthalpy (heat) and entropy (disorder) of a system.

Therefore, a negative Gibbs free-energy value is an indication of a spontaneous reaction. Option c is the correct answer.

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The old age of rock when examined is 21.4 million years if the ratio of uranium-235 to lead-207 is found to be 125,000:875,000. the half-life of uranium-235 is 700 million years.

P = [P + D] (1/2) ^(t/t(1/2))

where,

P represent the present parent amount

D is the present daughter amount

t(1/2) is the half life time period

t is the actual age

We know that,

t = (log[(P+D) /P] / log2) × t(1/2) ----------(1)

Given,

P = 97.6

D = 2.1

Ratio of P and D can be calculated as

P/D = 97.6/2.1

= 46.476

By substituting all the values in eq(1), we get

t = [(log 46.476 +1)/log2] × t(1/2)

Given,

The half life of U —Pb decay is 700 million years.

So,

t = [(log 46.476 +1)/log2] × 700

t = 21.4 million years.

Thus, we calculated that the the old age of rock when examined is 21.4 million years.

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DISCLAIMER:

The given question is misprint on portal.

Here is the correct form of question:

A rock is examined to determine its age, and the ratio of uranium-235 to lead-207 is found to be 125,000:875,000. the half-life of uranium-235 is 700 million years.

How old is the rock if it contains Uranium-235/ lead-207 ratio of 97.6 to 2.1?

Answer:

A inside the nucleus

Explanation:

All the protons (and neutrons) in an atom belong in the nucleus of an atom. Only the electrons of an atom stay in orbit.

Answer:Put pic

Explanation:we cant answer if theres no details(pictures)

Answer: Silver

Explanation:

Answer:

SILVERRRRRRRRRRR

Explanation:

Answer:

pistil

Explanation:

Answer:

i just ad the same question and but i fon know what ther answrr ied so i cant hep you but i had he smae question on rge mdhfyqf

Explanation:

Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

[tex]n = \frac{N}{L} \\[/tex]

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

[tex]n = \frac{7.1 \times {10}^{25} }{6.02 \times {10}^{23} } \\ = 117.940199...[/tex]

We have the final answer as

Hope this helps you

Answer:

Due to cis trans isomerism

Explanation:

Answer:

The answer is A

Explanation:

Pls put me as brainliest

The force helps food move through the large intestine during digestion is muscle contractions exert a pushing force on the food. Thus option A is correct.

Force is defined as a push or pull upon any object resulting from the object's interaction with another object. It is a vector quantity.

Force can also be defined as an external cause that, when applied, changes or tends to change the state of the body, if the body is in motion.

Force is expressed as

Force = mass x acceleration

There are five types of force

Digestion is define as the breakdown of food into smaller component  that can be absorbed into blood streams.

Thus, the force helps food move through the large intestine during digestion is muscle contractions exert a pushing force on the food. Thus option A is correct.

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Answer: I don't know try your best

Explanation:

Answer:

1.91×1021/6.023×10^23

Explanation:

need thanks and make me brainiest if it helps you

Answer:

In a Lewis symbol, the symbol for the element is used to represent the atom and its core electrons. Dots placed around the atom are used to indicate the valence electrons. ... In 1916, Gilbert Newton Lewis, an American chemist, suggested that molecules were formed when atoms shared pairs of outer electrons.

Explanation:

Lewis structures show the electrons in the valence shell of atoms in molecules.

Lewis structures are representations of molecules. They consist of the symbol of the element and the valence electrons in the atoms. The electrons are often shown as dots.

The atoms in molecules could be lone pairs or bond pairs. The bond pairs are shown as two dots on an atom. Since lone pairs are localized on an atom, they are shown as dots on the symbol of the atom that contain them.

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Answer:

Each magnet has a north and south end. Only opposite ends can attract, But if the ends are the same, they push away from each other. Magnets in some engines make it spin in a certain direction.

Answer: I think you have to look in the textbook

Explanation:

it's impossible to answer without the stinking textbook

Answer:

A molecule is an electrically neutral group of two or more atoms held together by chemical bonds. Molecules are distinguished from ions by their lack of electrical charge. hope this helps :)

Answer:

formula units

Explanation:

[tex]$KClO_3$[/tex]  is  potassium chlorate. It is an ionic compound containing potassium, chlorine and oxygen. The ion in potassium chlorate are held together by the ionic bonds in the lattice structure.

A representative particle may be defined as the smallest unit for which the substance exists in its natural form. For most of the elements, atom is the representative particle. Molecule is the representative particle for diatoms and molecular compounds. But for ionic compounds such as  [tex]$KClO_3$[/tex] , NaCl, etc. . the representative particle is its formula units.

60 mL volume of 0.25M KOH was needed to neutralize 10 mL of 0.50 M H3PO4.

The balanced reaction for the reaction of KOH and H3PO4 is shown below.

3KOH + H3PO4 → K3PO4 + 3H2O

mol of H3PO4 = (0.50 M) * (10 mL) * (1 L/1000 mL) = 5x10-3 mol

The number of moles of KOH needed to neutralize H3PO4 will depend on their stoichiometric ratio.

moles KOH = mol H3PO4 * (3 mol KOH / 1 mol H3PO4)

moles KOH = 5x10-3 mol * (3 mol KOH / 1 mol H3PO4)

moles KOH = 1.5X10-2 mol

mol of KOH = (concentration KOH)(volume KOH)

volume KOH = mol KOH / concentration KOH

volume KOH = 1.5 x 10 -2 mol / 0.25 M

volume KOH = 0.06 L or 60 mL

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Answer:

There is only one stable atom that does not have neutrons. It is an isotope of the element hydrogen called protium. Protium, which contains a single proton and a single electron, is the simplest atom. All other stable atoms contain some number of neutrons. hope this helps you :)

The lipid rafts are less fluid than the surrounding membrane at normal temperatures.

Cholesterol decreases the fluidity of the membrane at normal temperatures.

Lipid rafts regulate neurotransmission, receptor traffickinging and influence membrane fluidity.

For example, in phospholipid layer in cell membrane, there are hydrophilic heads (polar part of the layer) and hydrophobic tails (nonpolar part of the layer).

1) Small, non-polar molecules diffuse easily through this layer, no energy is required, this is passive transport.

2) Polar molecules cannot diffuse through phospholipid layer using passive transport, because hydrophobic tails does not allow that (polar molecules are reppeled), energy is required for that, this is active transport.

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Answer:

129.8 grams

Explanation:

Im a bit confused of what your are asking but if your are asking the mass in grams of K (Potassium) it is very easy dont worry

You multiply mols x Molecular weight.

So

3.32x 39.1= 129.8 grams

Answer:

Mercury

Explanation:

While it is true that most metals are solid at room temperature, mercury is liquid at room temperature hence mercury is often designated as the 'liquid metal'.

Thus, if i find a bottle on the shelf that has no solid in it, only liquid and i know that only pure metals are stored in that area of the laboratory, then i will quickly relabel it as mercury.

Answer:

4 ClO-

Explanation:

Bond length ∝ 1/ Bond order

Bond order of ClO − =1,

Bond order of ClO 2− =1.5,

Bond order of ClO 3− =1.66 ,

Bond order of ClO 4− =1.75.

Thus the order of bond length is

ClO 4− <ClO3− <ClO2−

<ClO −

Explanation:

The kinetic energy of an object is given by :

[tex]K=\dfrac{1}{2}mv^2[/tex]

1. Mass, m = 5 kg

Speed, v = 2 m/s

[tex]K_1=\dfrac{1}{2}\times 5\times (2)^2\\\\=10\ J[/tex]

2. Mass, m = 71 kg

Speed, v = 1 m/s

[tex]K_2=\dfrac{1}{2}\times 71\times (1)^2\\\\=35.5\ J[/tex]

3.  Mass, m = 71 kg

Speed, v = 5 m/s

[tex]K_3=\dfrac{1}{2}\times 71\times (5)^2\\\\=887.5\ J[/tex]

4. Mass, m = 1816 kg

Speed, v = 25 m/s

[tex]K_4=\dfrac{1}{2}\times 1816\times (25)^2\\\\=567500\ J[/tex]

Answer:

option D generally higher