Draw a Lewis structure for H3O+ . Include all hydrogen atoms and show all unshared electrons and the formal charges, if any. Assume that bonding follows the octet rule.

Answer:

a. 0.80 m³/kg

b. 0.67 m³/kg

Explanation:

a.

Step 1: Given data

Volume of the container (V): 20 m³

Mass of methane (m): 25 kg

Step 2: Calculate the specific volume (v) of methane

Specific volume is defined as the number of cubic meters occupied by one kilogram of matter.

v = V/m

v = 20 m³/25 kg = 0.80 m³/kg

b.

Step 1: Calculate the mass of the mixture

m = m(methane) + m(ethane)

m = 25 kg + 5 kg = 30 kg

Step 2: Calculate the specific volume (v) of the mixture

v = V/m

v = 20 m³/30 kg = 0.67 m³/kg

Answer:

1. B

2. A

3. E

4. D

5. C

Explanation:

Answer:

Specific heat capacity of copper is 0.385 J/g.°C

Explanation:

Given data:

Specific heat capacity of copper = ?

Heat absorbed by copper = 57.8 J

Mass of copper = 10 g

Temperature changes = 15°C

Solution:

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

by putting values

57.8 J = 10 g × c × 15°C

57.8 J = 150 g.°C × c

c = 57.8 J / 150 g.°C

c = 0.385 J/g.°C

Specific heat capacity:

It is the amount of heat required to raise the temperature of one gram of substance by one degree.

Specific heat capacity of copper is 0.385 J/g.°C.

Answer:

Explanation:

Given that:

[tex]2 NOBr_{(g)} \iff 2 NO_{(g)} + Br_{2(g)}[/tex]

From above:

[tex]K_p = 0.16 = \dfrac{(P_{NO})^2 (P_{Br})}{(P_{NOBr})^2}[/tex]

To predict the effect of the addition of Br₂(g);

The addition of Br₂(g) will favor the equilibrium to shift to the left i.e. formation of NOBr

The removal of some NOBr will cause the equilibrium position to shift to the left side. This is because concentration on the left side is decreased and the concentration on the right side will be increased. Thus, the equilibrium will shift towards where the concentration is reduced which is the left side.

Answer:

C. 10 W.

Explanation:

Hello!

In this case, since the power the person uses to lift the 10-N load is computed by using the formula:

[tex]P=\frac{W}{t}[/tex]

Whereas W is the work and t the time; we can compute the work by multiplying the force applied in 1 m:

[tex]W=10N*1m=10J[/tex]

Now, we divide it by the time to obtain:

[tex]P=\frac{10J}{1s}=10W[/tex]

Since joules over seconds are watts.

Best regards!

Answer:

A: Low charge on ions, large cation and small anion

Explanation:

Electrovalency is defined as process of transfer of electrons from its valence shell from one atom to another to form ions in such a manner that both elements will achieve stable electronic configuration.

Now cations are positively charged ions and therefore the bigger the cation, the more electrons it looses and thus the more it favors Electrovalency.

While an ions are negative and the lesser they are the more they favor Electrovalency.

Thus, the correct answer is option A

Answer:

Mass = 21.24 g

Explanation:

Given data:

Number of moles of ammonia = 7.08 mol

Mass of hydrogen reacted = ?

Solution:

Chemical equation:

3H₂ + N₂      →    2NH₃

Now we will compare the moles of ammonia and hydrogen.

             NH₃        :         H₂  

              2           :         3

          7.08         :        3/2×7.08 = 10.62

Mass of hydrogen:

Mass = number of moles × molar mass

Mass = 10.62 mol × 2 g/mol

Mass = 21.24 g

Answer:

See explanation

Explanation:

Average heart beat = Number of heart beats/ time

7.0 years = 7.0 * 365 * 24 * 60 = 3679200 minutes

If there are 69 beats in 1 minutes

There are x beats in 3679200 minutes

x = 253865 beats

x = 254000.00 beats ( to 3 sf)

beats in 7.00 years = 254000.000 beats

beats in 7.000 years = 254000.0000 beats

Answer:

4.17e+22 atoms of tin are present in the cube

Explanation:

We don't require the size of the cube. With the mass and the molar mass of tin = 118.7 amu we can find moles of Tin. As 1 mol = 6.022x10²³ atoms we can find the number of atoms:

Moles Tin:

8.21g * (1mol / 118.7g) = 0.0692 moles Tin

Atoms Tin:

0.0692 moles Tin * (6.022x10²³ atoms / mol) =

Answer:

answer: Weight is a 'force' and in the imperial system, it is measured in pounds-force (lbf or lbf). You might hear this term used together with the term 'slug'. A slug has a mass of 32.174049 lb. Explanation:

Explanation:

The unit pound is a unit of mass which is from the British imperial units of measurements. Pound is not included in CGS or SI units of mass.

Mass of a substance is its total amount which can be expressed in any units such as g, Kg etc. Our mass is affected by the gravity and thus the total weight of a body is mass multiplied by gravity.

There are different system for units and each units of a measurement is interrelated. Units are very significant in measurements and to identify the variables.

The most commonly used unit system is international system of units called the SI system. Where the mass length and time are in Kg, m and seconds. In CGS system it is gram, meter and seconds.

Pound is unit of mass from imperial unit system of britain. One pound = 0.4533 Kg.

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Answer:

85 ml

Explanation:

move the decimal place over two times

Answer:

The atmosphere is the thin envelope of gas molecules surrounding the Earth; it is held down by Earth's gravitational pull. The atmosphere is concentrated at the Earth's surface and rapidly thins as you move upward, blending with space at about 100 miles above sea level

Explanation: science

Answer:

Öncelikle burda soru Why is the earth atmosphere located above earth crust yani Türkçe olarak Dünya atmosferi neden yer kabuğunun üzerinde yer alıyor diyor

Answer: Fluorine

Explanation: Fluorine has an oxidation state of -1, meaning it gains 1 electron in chemical bonds, forming a negative ion. Magnesium has an oxidation state of +2, nitrogen has -3, and lithium has an oxidation state of +1.

Answer:

Fluorine.

Explanation:

I took this test not to long ago. I got this question correct. Also, the reason is because every other element is balanced.

Answer:

3,2,1,6

2,3,3,2

Explanation:

HOPE THIS HELPED

Answer:

D= 109.5 degrees, 109.5 degrees, 120 degrees

Explanation:

The bond angle observed for any bond between two chemical species depends on the hybridization of the atoms.

However, for organic compounds, single bonds normally involve sp3 hybridized atoms with a bond angle of 109.5 degrees such as in the positions marked a and b.

However, a double bond is made of atoms in sp2 hybridized state with a bond angle of 120 degrees such as in c.

Answer:

The factors are various, although there are main and accessories.

The main factor is the climate of the area, that is, if it is a rainier climate, there will be more water masses in the lands where this climate abounds (usually it is wet).

Other factors are: geographical features, flows, the path of rivers, lakes or lagoons, the presence or absence of ports, the number of trees and the distribution of rocks.

Explanation:

Another important factor is the height of the land, the higher the level of the earth, the more difficult it will be to accumulate water, this is how low areas are also flooded.

Answer: Avogrado's Constant

Explanation:

One mole of a substance is equal to 6.022 × 10²³ units of that substance (such as atoms, molecules, or ions). The number 6.022 × 10²³ is known as Avogadro's number or Avogadro's constant. The concept of the mole can be used to convert between mass and number of particles.

Answer:

[tex]m=1,182.8g[/tex]

Explanation:

Hello!

In this case, since the relationship between molecules and mass is first analyzed via the Avogadro's number to compute the moles in the given molecules:

[tex]mol=4.63x10^{24}molec*\frac{1mol}{6.022x10^{23}molec}=7.69mol[/tex]

We now use the molar mass of carbon tetrachloride (153.81 g/mol) to obtain the required grams:

[tex]m=7.69mol*\frac{153.81g}{1mol} \\\\m=1,182.8g[/tex]

Best regards!

Answer:

The lungs

Explanation:

Asthma is a disease that affects the airways of your lungs. With asthma, your airways' lining tends to always be in a hypersensitive state characterized by redness and swelling. Causing the airways to swell and, in severe cases, close completely off.

hope this helps, this should also probably be in biology:)

Answer:

(2)

Explanation:

Answer:

7 is answer.

Explanation:

therefore, the mass number of an atom with 3 protons,4 neutrons,and 3 electrons is 7.

I hope it's helpful!

Answer:

Empirical formula is C₄H₁₀O

Explanation:

Values for C, H and O are determined as centesimal composition.

64.80 g of C in 100g of compound

13.62g of H in 100 g of compound

21.58 g of O in 100 g of compound.

We convert the mass to moles:

64.80 g . 1mol/ 12g = 5.4 moles of C

13.62 g . 1 mol /1g = 13.62 moles of H

21.58 g . 1 mol/16g = 1.35 moles of O

We pick the lowest value and we divide:

5.4 moles of C / 1.35 = 4 C

13.62 moles of H / 1.35 = 10 H

1.35 moles of O / 1.35 = 1 O

Empirical formula is C₄H₁₀O, it can be the diethyl ether.

We confirm, the excersise is well done.

Molar mass = 74g/mol

74 g of compound we have (12 . 4)g of C

In 100 g of compound we may have (100 . 48) / 74 = 64.8 g

Answer:

4.3 g

Explanation:

Ammonium phosphate is an important ingredient in many fertilizers. It can be made by reacting phosphoric acid with ammonia . What mass of ammonium phosphate is produced by the reaction of 2.8 g of phosphoric acid?

Step 1: Write the balanced equation

3 NH₃ + H₃PO₄ ⇒ (NH₄)₃PO₄

Step 2: Calculate the moles corresponding to 2.8 g of H₃PO₄

The molar mass of H₃PO₄ is 97.99 g/mol.

2.8 g × 1 mol/97.99 g = 0.029 mol

Step 3: Calculate the moles of (NH₄)₃PO₄ produced from 0.029 moles of H₃PO₄

The molar ratio of H₃PO₄ to (NH₄)₃PO₄ is 1:1. The moles of (NH₄)₃PO₄ produced are 1/1 × 0.029 mol = 0.029 mol.

Step 4: Calculate the mass corresponding to 0.029 moles of (NH₄)₃PO₄

The molar mass of (NH₄)₃PO₄ is 149.09 g/mol.

0.029 mol × 149.09 g/mol = 4.3 g

Answer: B) 0.005 55 cm

Hope you have a blessed day!

Answer:

1.048x10⁻³M/s is the rate of reaction

Explanation:

Based on the reaction:

2HBr → H₂ + Br₂

The rate of reaction is defined as:

1/2 Δ[HBr] / Δt

1/2 because the reaction is consuming 2 times HBr per mole of reaction

Where Δ[HBr] is 0.550M - 0.506M = 0.044M

And Δt is 21.0s. The average rate of reaction is:

1/2 0.044M / 21.0s =

Answer:

Oxides of nitrogen are a mixture of gases that are composed of nitrogen and oxygen. Two of the most toxicologically significant compounds are nitric oxide (NO) and nitrogen dioxide (NO2). Other gases belonging to this group are nitrogen monoxide (or nitrous oxide, N2O), and nitrogen pentoxide (NO5).

Explanation:

Answer:

302 kj heat is released by lowering the temperature

302kJ is the amount of heat which is released by lowering the temperature of 825 grams of molten (liquid) lead at 800K to solid lead at 295K. Therefore, the correct option is option C.

Heat is energy that is transmitted from one object to another as a result of a temperature differential. When two bodies of differing temperatures come into contact, energy is transmitted as heat flows first from hotter to the colder.

melting point of lead= 328°C.

T₁ = 328 + 273 = 800K

T₂ = 295K

T₃ = 600.61K

latent head of fusion of lead = 4.8 kJ/mol

specific heat of solid lead= 0.13 J/g/K

specific heat of liquid lead = 0.14 J/g/K

heat= mS∆T + (m/M)Lf + mS∆T'

= 23g × 0.13 J/g/K × (601 - 297)K + 23g/207g/mol × 4.8 kJ/mol + 23g × 0.14 J/g/K × (702 - 601)K

=302kJ

Therefore, the correct option is option C.

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Answer:

The new pressure is 1,135.67 torr

Explanation:

Boyle's law establishes the relationship between pressure and volume of a gas when the temperature is constant, establishing that the pressure of a gas in a closed container is inversely proportional to the volume of the container. Mathematically, this law says that the product of pressure and volume is constant:

P*V=k

Charles's law establishes the relationship between the temperature and the volume of a gas when the pressure is constant. This law states that the volume is directly proportional to the temperature of the gas. So, Charles's law says that the quotient that exists between the volume and the temperature will always have the same value:

[tex]\frac{V}{T} =k[/tex]

Finally, Gay-Lussac's Law is a gas law that relates pressure and temperature at constant volume. This law says that the pressure of the gas is directly proportional to its temperature:

[tex]\frac{P}{T} =k[/tex]

Combined law equation is the combination of three gas laws called Boyle's, Charlie's and Gay-Lusac's law:

[tex]\frac{P*V}{T} =k[/tex]

Analyzing an initial state 1 and a final state 2, it is satisfied:

[tex]\frac{P1*V1}{T1} =\frac{P2*V2}{T2}[/tex]

In this case:

Replacing:

[tex]\frac{662 torr*46.7 L}{266 K} =\frac{P2*35 L}{342 K}[/tex]

Solving:

[tex]P2=\frac{342 K}{35 L} *\frac{662 torr*46.7 L}{266 K}[/tex]

P2= 1,135.67 torr

The new pressure is 1,135.67 torr