The density of a gas measured at 20 c is 1.78x 10 g/cm. What is the volume of 45.0 g of the gas

Answer:

1490 and it has 3 significant digits

Explanation:

Answer:

1.49x10^3

Explanation:

There are three significant figures and it is best expressed in scientific notation

An unbranched alkene with one double bond and 4 carbon atoms would have 8 hydrogen atoms.

What are Hydrocarbons?

Hydrocarbon belong to any class of organic chemicals made up of only carbon (C) and hydrogen (H).

If you add an unbranched alkene with one double bond and 4 carbon atoms to a butane having 10 hydrogen atoms, it will have 2 fewer hydrogen atoms making the unbranched alkene to have 8 hydrogen atoms.

In conclusion, an unbranched alkene with one double bond and 4 carbon atoms would have 8 hydrogen atoms.

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There are approximately 0.0078 moles of molybdenum present in 0.75 grams.

In order to determine the number of moles of molybdenum present in 0.75 grams, we first need to know the molar mass of molybdenum. The molar mass of molybdenum (Mo) is 95.94 g/mol.

Next, we can use the formula:

moles = mass ÷ molar mass

Plugging in the given values, we get:

moles = 0.75 g ÷ 95.94 g/mol

Simplifying this expression, we get:

moles = 0.0078 mol

Therefore, there are approximately 0.0078 moles of molybdenum present in 0.75 grams.

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A piece of magnesium in the shape of cube measuring with height of 5.62 cm, and this magnesium sample having mass of 1.41 g has a density of 1.78 g/cm³.

What is Density?

Density is known as the mass of substance per unit volume. Density is denoted by a Greek symbol ρ. Density is equal to the mass substance divided by its volume. The SI unit of Density is g/cm ³or kg/m³.

                                     ρ = m

                                             v

where,

ρ = density

m = mass

v  = volume

Given :

Height of the cylinder is 5.62 cm ,

Diameter of the cylinder is 1.34 cm

Radius = D/2 = 1.34/2 cm

Radius = 0.67 cm

Volume of cylinder = πr²h

Volume of cylinder = 3.14 × (0.67)² × 5.62

                                = 7.92 cm³

 Density =   Mass  

                 Volume

Density = 14.1

                 7.92

 Density = 1.78 g/cm³

Hence, the density of sample = 1.78 g/cm³ .

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Answer:

\(\boxed{\bold { \Large { \boxed {0.28 \ kg}}}}\)

Explanation:

Use kinetic energy formula

\(\sf \displaystyle K.E=\frac{1}{2} mv^2\)

Solve for m

\(\displaystyle 125=\frac{1}{2} m \times 30^2\)

\(m=0.2777..\)

A man has a kinetic energy of 125J when he runs at 30m/s.  0.2777  is the mass of the man.

Kinetic energy is the energy of motion, observable as the movement of an object, particle, or set of particles.

Use kinetic energy formula:

Given data:

K.E = 125J

V = 30m/s

K.E = \(\frac{1}{2} mv^2\)

Solve for m

125J = \(\frac{1}{2} \;m \;{30m/s}^2\)

m = 0.2777

Hence,  0.2777 is the mass of the man.

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The chemical formula O₂ which is oxygen is a molecule as it is made up  of 2 oxygen atoms.

Chemical  formula is a way of representing the number of atoms present in a compound or molecule.It is written with the help of symbols  of elements. It also makes use of brackets and subscripts.

Subscripts are used to denote number of atoms of each element and brackets indicate presence of group of atoms. Chemical formula does not contain words. Chemical formula in the simplest form  is called empirical formula.

It is not the same as structural formula and does not have any information regarding structure.It does not provide any information regarding structure of molecule as obtained in structural formula.

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Answer:

I think tube like ... is it right

Answer:

The actual answer is flowers have heart like structures that transport nutrients and water with in the plants.

The partial pressure of nitrogen on Venus is approximately 321.914 kPa.

To find the partial pressure of nitrogen on Venus, we need to calculate the partial pressure using the mole fraction of nitrogen and the total atmospheric pressure. First, we convert the total atmospheric pressure from psi to kilopascals (kPa) since the mole fraction is given in terms of kPa.

1 psi = 6.89476 kPa

Therefore, the total atmospheric pressure on Venus is:

1334 psi × 6.89476 kPa/psi = 9197.53 kPa

Next, we can calculate the partial pressure of nitrogen using the mole fraction. The mole fraction of nitrogen is given as 0.035, which means that nitrogen makes up 3.5% of the total moles of gas in the atmosphere.

The partial pressure of nitrogen is given by:

Partial pressure of nitrogen = Mole fraction of nitrogen × Total atmospheric pressure

Partial pressure of nitrogen = 0.035 × 9197.53 kPa

Partial pressure of nitrogen = 321.914 kPa

Therefore, the partial pressure of nitrogen on Venus is approximately 321.914 kPa.

It's important to note that the given atmospheric composition of Venus's atmosphere and the total atmospheric pressure are approximate values and can vary depending on specific conditions and measurements.

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Answer:

C Group 11

Explanation:

Group 11, by modern IUPAC numbering, is a group of chemical elements in the periodic table, consisting of copper (Cu), silver (Ag), and gold (Au).

These elements show highest electrical conductivity.

Answer:

C Group 11

Explanation:

Group 11, by modern IUPAC numbering, is a group of chemical elements in the periodic table, consisting of copper (Cu), silver (Ag), and gold (Au).

These elements show highest electrical conductivity.

Explanation:

Answer:

Why aren't diamonds found evenly distributed on Earth? Diamonds are only formed under specific conditions that involve geological processes, such as volcanic activities and plate movements. Since these conditions and processes only take place in certain areas, you can only find diamonds in these special places.

Explanation:

Answer: Calcium, Magnesium, and Iron

Explanation:

The reactivity series is a list of metals arranged in the order of their decreasing activities. Sodium is the second metal of activity series so it can displace calcium, magnesium and iron because all of them come after sodium in activity series.

Hope this helps

The most suitable separation technique for this mixture is a combination of magnetic separation and filtration.

First, a magnet can be used to separate the iron fillings from the sand and salt mixture. This is because iron is magnetic and will be attracted to the magnet, leaving the sand and salt behind.

Next, the sand and salt mixture can be dissolved in water. Since salt is soluble in water but sand is not, the salt will dissolve while the sand remains behind. The mixture can then be filtered to separate the sand from the saltwater solution.

Finally, the saltwater solution can be heated to evaporate the water and obtain the salt as a solid residue.

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Answer:

The answer is D

Explanation:

Non metals are:

Hydrogen (H)

Sulphur (S)

Phosphorus (P)

Carbon (C)

Fluorine (F)

Oxygen (O)

Nitrogen (N)

Chlorine (Cl)

Bromine (Br)

Helium (He)

Argon (Ar)

Iodine (I)

Neon (Ne)

Krypton (Kr)

Radon (Rn)

Selenium (Se)

Xenon (Xe)

The chlorine radicals can also react with each other to form chlorine molecules, which terminates the chain reaction.

(i) The monochlorinated products resulting from the reaction of 2-methylpentane are:

1-chloro-2-methylpentane

2-chloro-2-methylpentane

3-chloro-2-methylpentane

(ii) The major product in this reaction is 2-chloro-2-methylpentane.

(iii) The step-wise mechanism for the radical halogenation of 2-chloro-2-methylpentane are:

1. Initiation :- This step involves the homolytic cleavage of the chlorine molecule to form two chlorine radicals.

\(Cl^ 2\)→ \(2Cl\)·

2.Propagation:-  \(Cl\)· + 2-methylpentane → \(HCl\) + 2-methylpentyl•

  2-methylpentyl• +\(Cl^ 2\) → 2-chloro-2-methylpentyl• + \(Cl\)·

The 2-methylpentane molecule reacts with the chlorine radical to form a 2-methylpentyl radical and hydrogen chloride. The 2-methylpentyl radical then reacts with another chlorine molecule to form the 2-chloro-2-methylpentyl radical and another chlorine radical.

3.Termination:- 2-methylpentyl• + \(Cl\)· → 2-chloro-2-methylpentane

2-methylpentyl• + 2-methylpentyl• → 2,2-dimethylpentane

\(Cl\)· + \(Cl\)· → \(Cl^ 2\)

The 2-chloro-2-methylpentyl radical reacts with a chlorine radical to form the major product, 2-chloro-2-methylpentane. The 2-methylpentyl radical also reacts with another 2-methylpentyl radical to form 2,2-dimethylpentane.

Finally, the chlorine radicals can also react with each other to form chlorine molecules, which terminates the chain reaction.

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The question is incomplete; the complete question is;

Which of the following statements is/are true for a 0.10 M solution of a weak acid HA?

a. [ H+] >> [ A−]

b. [ H+] = [ A−]

c. The pH is 1.00.

d. The pH is less than 1.00.

Answer:

b. [ H+] = [ A−]

Explanation:

Given the acid as HA, we know that being a weak acid, its dissociation in water can never be 100%. If it were a strong acid, then it could have undergone a 100% dissociation in solution. The conjugate base of a weak acid is a always a weak base hence A^- is expected to act as a weak base. At the same concentration, weak acids have a higher pH value than strong acids. Hence if the pH of a strong acid HA is 1, then the pH of a weak acid HA must be greater than 1.

But, we look at the equation for the dissociation of the weak acid HA

HA(aq)⇄H^-(aq) + A^-(aq). This implies that the HA dissociates in a 1:1 ratio therefore; [H+] = [ A−], hence the answer given above.

Answer:

The correct answer would be : 33.8 g

Explanation:

Molar mass of ammonia,

Molar Mass = 1* Molar Mass(N) + 3* Molar Mass (H)

= 1*14.01 + 3*1.008  = 17.034 g/mol

mass(NH3)= 25.0 g  (given)

number of mol of NH3,

n = mass of NH3/molar mass of NH3

=(25.0 g)/(17.034 g/mol)

= 1.468 mol

Now,

Molar mass of O2

= 32 g/mol

mass(O2)= 45.0 g

similar as ammonia

n (O2)=(45.0 g)/(32 g/mol)

= 1.406 mol

Balanced chemical equation is:

4 NH3 + 5 O2 ---> 4 NO + 6 H2O

1.83456 mol of O2 is required  for 1.46765 mol of NH3

by the calculation we have only 1.40625 mol of O2

Thus, the limiting agent will be - O2

now the Molar mass of NO,

= 1*14.01 + 1*16.0

= 30.01 g/mol  (similar formula used for NH3)

Balanced equation :

mol of NO formed = (4/5)* moles of O2

= (4/5)×1.40625  (from above calculation)

= 1.125 mol

mass of NO = number of moles × molar mass

= 1.125*30.01

= 33.8 g

Thus, the correct answer would be : 33.8 g

The amount of nitrogen oxide that can be formed in the given mass is 44.12 g.

The given parameters;

The reaction of the ammonia and oxygen is written as follows;

\(4NH_3(g) \ + \ 5O_2 (g) \ --> \ 4NO (g) \ + \ 6H_2O(g)\\\\\)

Molar mass of NH₃ = (14) + (3 x 1) = 17 g/mol

Molar mass of NO = (14) + 16 = 30 g/mol

4(17 g/mol) of NH₃ ------------------ 4(30)

25 g/mol of NH₃ --------------------- ?

\(= \frac{4(30) \times 25}{4(17)} \\\\= 44.12 \ g\)

Thus, the amount of nitrogen oxide that can be formed in the given mass is 44.12 g.

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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.

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At 300 K, The gases in order of increasing average velocity will be N2O < Ar < N2 < CH4

The molecular mass of of a gas is directly proportional to its Molecular Velocity. That is to say that  Gases made up  lighter molecules will have greater  high-speed particles and relatively higher velocities while . Gases made up of heavier molecules have greater  low-speed particles, and  relatively lower velocities.

Therefore  considering the gases

The order of increasing average velocity at 300K will be N2O < Ar < N2 < CH4

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Answer: metal turn orange and weaker as it gets oxidised

Explanation:

Answer:

403.2 grams of oxygen

Explanation:

According to the balanced chemical equation, 2C2H6 + 7O2 —> 4CO2 + 6H2O, 4 moles of carbon dioxide (CO2) are produced for every 7 moles of oxygen (O2) that react. Therefore, if 7.2 moles of carbon dioxide are produced, the number of moles of oxygen that react is (7.2 moles CO2) * (7 moles O2 / 4 moles CO2) = 12.6 moles O2.

Since the molar mass of oxygen is approximately 32 g/mol, the mass of oxygen that reacts is (12.6 moles O2) * (32 g/mol) = 403.2 g. Therefore, 403.2 grams of oxygen react in order to produce 7.2 moles of carbon dioxide.

Well because sometimes, weather forecasters don't get it right. Some weather phenomena can occur when we aren't expecting them; they are impromptu.

I cant help u coz it is an (well i dont know) but i think u r in college so this would be a hard question

Answer: this is the correct answer :)

Explanation:

Image shows ;)

As per chemical changes, a color change can be seen when a substance change into a new substance.

Chemical changes are defined as changes which occur when a substance combines with another substance to form a complete  new substance.Alternatively, when a substance breaks down or decomposes to give new substance it is also considered to be a chemical change.

There are several characteristics of chemical changes like those of  change in color, change in state , change in odor and even change in composition . During chemical change there is also formation of precipitate an insoluble mass of substance or even evolution of gases.

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Answer:

sounds wave

Explanation:

From alarm, microwave, laser, TV, water waves and a musical instrument, everything release sounds.

(Not the same)

If it convinced you please add this in the brainlist

Answer:

pH = 5.24

Explanation:

Mixture of acetic acid with acetate ion is a buffer (Mixture of a weak acid with its conjugate base). The pH of a buffer can be determined using Henderson-Hasselbalch equation:

pH = pKa + log₁₀ [A⁻] / [HA]

Where pKa is -log Ka = 4.74; [A⁻] is the concentration of conjugate base (Acetate ion) and [HA] is molar concentration of the weak acid.

Concentration of the acetic acid in the 100mL≡0.1L (76mL + 24mL) solution is:

[HA] = 0.024L ₓ (1mol / L) / 0.1L = 0.24M

[A⁻] = 0.076L ₓ (1mol / L) / 0.1L = 0.76M

Replacing in H-H equation:

pH = 4.74 + log₁₀ [0.76M] / [0.24M]