How many milliliters of hydrogen gas are produced by the reaction 0.020 mol of magnesium with excess of hydrochloric acid at STP?

Answers

Answer 1

Answer: The reaction of magnesium and hydrochloric acid is a single displacement reaction. The reaction is expressed as Mg + 2HCl= MgCl2 + H2. There is a one is to one correspondence of Mg and H2. Hence there is also 0.02 mol of H2. Using PV=nRT where T is 273 K, P is 1 atm and R is 0.0821 L atm/mol K, volume is equal to 0.4483 L or 448.3 mL.

Answer 2

Answer:

Answer: The answer is D

Explanation:

Related Questions

How many molecules of glucose are in a 2.0 mL of a 1.02 mM solution of glucose
The density of gold is 19.32. Give two reasons why this statement is incomplete
At standard pressure, how do the boiling point and the freezing point of NaCl(aq) compare to the boiling point and the freezing point of H2O(image)?
What is a significant advantage to the cell in having pyruvate dehydrogenase consist of a large
A dilute, aqueous potassium nitrate solution is best classified as a(1) homogeneous compound(2) homogeneous mixture(3) heterogeneous compound(4) heterogeneous mixture

Einstein’s Theory of Relativity was built on the research and ideas of other scientists. The Theory of Relativity proposes that the speed of light is a constant.Which of the following statements explains why this is considered to be a scientific theory?

Scientists believe it is the best explanation because it is built on data and observations.

The majority of the scientific community voted on this theory over other possible explanations.

It is the best explanation because it supports the beliefs and opinions of most scientists.

It is a scientific law that has been supported by experimental data.

Answers

Einstein’s Theory of Relativity was built on the research and ideas of other scientists. The Theory of Relativity proposes that the speed of light is aconstant. The statement that explains why this is considered to be a scientific theory is that the majority of the scientific community voted on this theory over other possible explanations.

Answer:

The correct answer will be option-It is the best explanation because it supports the beliefs and opinions of most scientists.

Explanation:

Albert Einstein is known for his theory of relativity which states that energy is a converted form of mass to the square of the speed of light which is constant.

Albert Einstein was a theoretical physicist who used the facts and data from the papers of the previous physicist. Although he used the facts his theory became one of the important theory in the physics world as it explained the path of the light and the form in which it travels.

This theory is well accepted today as it was supported by the experiments and observation of the other works of different scientist. This led to the acceptance of the theory worldwide.

Thus, the selected option is the correct answer.

#8 please explain if you can
thanks

Answers

The answer is D because the air is made of nitrogen and oxygen. The reaction is endothermic.
Hope this helps you! :)

For which of the following equilibria does Keq= [O2]?a. O2(l)<=>O2(g)
b. 2O3(g)<=>3O2(g)
c. 2H2O(l)<=>2H2(g)+ O2(g)
d. 2Hg(s)+ O2(g)<=>2HgO(s)
e. C(s)+ O2(g)<=>CO2(g)

Answers

its A if youre doing plato

Pb(NO3)2 (aq) + 2 NaI (aq) --> PbI2 (s) + 2 NaNO3 (aq)Starting with with 50.0 grams of Pb(NO3)2 and 30.0 grams of NaI:
A. What is the limiting reagent?
B. How many grams of the excess reactant remains?
C. How many grams of each product is formed?
D. If 12 grams of NaNO3 actually formed in the reaction, what is the percent yield of this reaction?

Answers

Answer:

Explanation:

Pb(NO3)2 (aq) + 2 NaI (aq) --> PbI2 (s) + 2 NaNO3 (aq)

MM for each compound -

Pb(NO3): 207 + 14x2 + 16x3x2 = 331

PI2: 207 + 127x2 = 461

NaI: 23 + 127 = 150

NaNO3: 23 + 14 + 16x3 = 85

Moles of Pb(NO3)2 = 50/331 = 0.15

Moles of NaI = 30/150 = 0.2

Ratio of moles is 1:2

So NaI is limiting

Limited to 0.2/2 = 0.1 mole of Pb(NO3)2

Excess = 0.15 - 0.1 = 0.05 mole

Mass remains = 0.05x331 = 16.55 grams

Moles of NaNO3 formed = Moles of NaI reacted = 0.2

Mass = 0.2x85 = 17 grams

Moles of PbI2 formed = Moles of Pb(NO3)2 reacted = 0.1

Mass = 0.1x461 = 46.1 grams

If 12 grams of NaNO3 actually formed in the reaction,

percent yield = 12/17x100% = 70.6%

Answer:

Explanation:

Moles of Pb(NO3)2 = mass/molecular mass

= 50.0 grams/(207.20*1 + 14.01*2 + 16*6)

= 50.0 grams/331.22

= 0.15 moles

Moles of NaI

= 30/(22.99+126.9)

= 30/149.89

= 0.2 Moles

A. NaI is less 2x Pb(NO3)2 so NaI is the limiting reagent.

B. The ratio is 1 to 2 so there is 0.15 - 0.2/2 = 0.05 mole

or 16.78 grams of Pb(NO3)2 left.

C. As NaI is limiting, only 0.2 Moles of NaNO3 is formed.

Mass = Moles * Molecular Mass

Molecular Mass of NaNO3 can be calculated as:

Na - 22.99

N - 14.01

O - 3(16) = 48

23+14+48 = 85gram / mole

Thus, Mass = 0.2*85 = 17 gram of NaNO3

Mass is conserved in a chemical reaction.

Mass of PbI2 can be calculated as:

50+30-16.78-17

= 46.3 gram of PbI2

Mass =

12.75

Thus, 12.75g of Sodium Nitrate can be formed

Which compound is used to make asphalt?

Answers

Answer:

a saturated hydrocarbon that has more than 35 carbons in its chain

Explanation: Alkanes with a chain length of approximately 35 or more carbon atoms are found in bitumen (asphalt), used (for example) in road surfacing. However, the higher alkanes have little value and are usually split into lower alkanes by cracking.

Asphalt is a biproduct of making gasoline, diesel, kerosene, jet fuel, all from crude oil pumped from the ground. Asphalt is the garbage or waste that comes out the bottom of the process of distilling those products. They heat the thick oily-sooty gunky asphalt and mix it with rock or sand and make roads out of it. So the compound would be the long hydrocarbon chains.

Why does the temperature of heated water change when you increase the volume?

Answers

By heating the water the temperature of 0C to 4C, one can observe a decrease in its volume. In this temperature range, there is the phenomenon of anomalous thermal expansion of water.
The volume of water in the range of 0C to 4C decreases and 4C to 100C from growing. This anomalous behavior of water is associated with the fact that liquid water a temperature slightly above 0C, there are remnants of the loose structure of the ice. The temperature increase destroys this structure, allowing denser packing of the molecules, and thus the volume of water decreases.

Other Questions

Which scientist performed the cathode ray experiment leading to the discovery of electrons

What physical state of matter is associated with the strongest attractive forces between particles (molecules, ions, or atoms)?

Select the reagent for the following reaction. ? methyl butyrate N-methylbutyramide Acid halide Anhydride Ester Amide Alcohol Amine Carboxylic acid or carboxylate (the conjugate base of carboxylic acid)

What volume measured in stp will 3.75 grams of helium gas occupy?