Answer: 50.7 moles
Explanation:
given mass/ molecular mass
= 50.7/1
=50.7
Answer:
[tex]\boxed {\boxed {\sf 25.1 \ mol \ H_2}}[/tex]
Explanation:
We are asked to calculate the number of moles in 50.7 grams of hydrogen gas. To do this, we will use the molar mass or the mass of 1 mole of a substance. These values are found on the Periodic Table because they are equivalent to the atomic masses, but the units are grams per mole instead of atomic mass units.
Look up the molar mass of hydrogen (H).
H: 1.008 g/molNote that we are given grams of hydrogen gas. This is a diatomic molecule with 2 hydrogen atoms. The formula is H₂. Multiply the molar mass by 2 to find hydrogen gas's molar mass.
H₂ = 1.008 *2 = 2.016 g/molNow we can convert using dimensional analysis. Set up a ratio using the molar mass.
[tex]\frac {2.016 \ g \ H_2}{1 \ mol \ H_2}[/tex]
We are converting 50.7 grams to moles, so we multiply the ratio by this value.
[tex]50.7 \ g \ H_2 *\frac {2.016 \ g \ H_2}{1 \ mol \ H_2}[/tex]
Flip the ratio so the units of grams of hydrogen gas cancel.
[tex]50.7 \ g \ H_2 *\frac{1 \ mol \ H_2} {2.016 \ g \ H_2}[/tex]
[tex]50.7 \ *\frac{1 \ mol \ H_2} {2.016 }[/tex]
[tex]\frac {50.7} {2.016 } \ mol \ H_2[/tex]
[tex]25.14880952 \ mol \ H_2[/tex]
The original value of grams (50.7) has 3 significant figures, so our answer must have the same. For the number we calculated, that is the tenths place. The 4 in the hundredth place to the right tells us to leave the 1 in the tenths place.
[tex]25.1 \ mol \ H_2[/tex]
50.7 grams of hydrogen gas is equal to approximately 25.1 moles of hydrogen gas.
Ceramics make excellent refractory materials. A material is said to be refractory if it:
1 has high refractive index
2 retains its strength at high temperatures
3 resists the flow of electric current 4 all of the mentioned
Answer:
Option 2 is the correct answer
Explanation:
Ceramics, which mainly consist of oxides, carbides and nitrides, can withstand very high temperatures; furnaces are generally lined with such ceramics.
All living organisms are made of
They are the smallest units of a living.
thing that can perform all life processes.
A. stones
B. cells
C. water drops
D. bricks
9. Hydrogen is 99% H, 0.8% ?H, and 0.2% H. Calculate its average atomic mass.
Answer: Technically, this cannot be answered, since none of the H atoms have a mass number assigned. With the assumption noted delow, I calculate 1.012 as the average atomic mass.
Explanation:
My answer is based on assumed masses for the three H isotopes:
1H : 1 AMU
2H: 2 AMU Deuterium
3H: 3AMU Tritium
AMU Rel Abund. Wt. Avg
1H 1 99.00% 0.99
2H 2 0.80% 0.016
3H 3 0.20% 0.006
Sum 1.012
Write differences between reactants and products.
Reactants - The substance which participate in a chemical reaction are called reactants.
[tex] \rm \: Example - H_2 \: , \: O_2[/tex]
Product - The substance which are formed by chemical reaction between the reactants are called product.
[tex]\rm \: Example - H_2 O[/tex]
Explanation:
reactant is a substance that is present at
the start of a chemical reaction.
product is a substance
that is present at the end of a chemical
reaction.
As the human population has grown. Earth's ecosystems and the balance
of natural cycles have been negatively affected. What are some
examples of how the social factors of sustainability (Fig. 1-3) could be
used to help repair environmental damage caused by humans?
40 POINTS I NEEDA ASAP
Which of the following is the correct net ionic equation for the formation of barium sulfate?
O B2+(aq) + SO42- (aq) → BaSO4 (s)
Ba2+(aq) + S2(aq) → Bas(s)
Be2+ (aq) + S042(aq) → BeSO4 (5)
Ba2+(aq) + SO42 (aq) → BaSO4 (5)
Answer:
Ba²+ (aq) + SO4²- (aq) --> BaSO4(s)
The net ionic equation for the formation of barium sulphate is Ba²⁺₍aq₎ + SO₄² ₍aq₎ → BaSO₄₍s₎. Therefore, option D is correct.
What is barium sulphate ?The inorganic substance having the chemical formula BaSO₄ is called barium sulfate. It is a tasteless, crystalline white substance that is insoluble in water. The main commercial source of barium and the materials made from it is the mineral barite, which is where it naturally occurs.
The use of barium sulfate aids in the diagnosis or discovery of issues with the esophagus, stomach, and bowels. It is a contrast material for radiography. To make the various bodily components clearly visible, contrast chemicals are used.
A barite-derived metallic compound with a silvery white color. In barium swallows and barium enemas, it is diluted with water to aid visualize the digestive tract on an x-ray.
Thus, option D is correct.
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How will a decrease in the concentration of a reactant affect a chemical reaction?
Answer:
When the concentrations of the reactants are raised, the reaction proceeds more quickly. ... When solids and liquids react, increasing the surface area of the solid will increase the reaction rate. A decrease in particle size causes an increase in the .
a. Phenol (C6H5OH) is an aromatic compound and a colourless liquid widely used in household products
and medicine. When it reacts with chlorine liquid (chlorine is a diatomic molecule), in the presence of a
catalyst, one of the aromatic hydrogen atoms attached directly to a C atom is replaced with a chlorine
atom, and liquid chlorophenol is formed. This replacement process is called chlorination
Write a balanced chemical equation for the chlorination reaction and explain how you balanced it. Note
that hydrogen chloride gas (HCI) is also a product of this chemical reaction and you should ignore the
presence of the catalyst in the equation.
Because there are 2 Cl on the left, we will put a coefficient 2in front of HCl on the right side to balance out the Cl. This would result in an unequal amount of H, with 6 on the right side and 7 in the left, so we have to put a coefficient of 2 in front of C6H5OH and C6H4OH on both sides to balance out the H. By doing this, we would obtain an equal amount of H on both sides. The Carbon is already balanced, and so is the Oxygen.
The balanced chemical reaction equation for the reaction between aromatic phenol and chlorine gas in the presence of FeCl3 as catalyst is as follows;
C6H6O + Cl2 -------> C6H5OCl + HCl
An aromatic compound has 4n + 2 number of pi electrons. This condition is satisfied by phenol. Hence, phenol has the stability associated with aromatic compounds.
The reaction of phenol with chlorine in the presence of a catalyst such as FeCl3 is an aromatic electrophillic substitution reaction.
This reaction yields a chlorinated phenol (one of the aromatic hydrogen atoms attached directly to a C atom is replaced with a chlorine atom and chlorophenol is formed).
A balanced chemical reaction equation is one in which the number of atoms of each element at the reactant side and the product side are equal. This condition is satisfied for the reaction;
C6H6O + Cl2 -------> C6H5OCl + HCl
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Name the reaction & mechanism of the following reactions:
Answer:
double displacement reaction
Answer:
DECOMPOSITION REACTIONDOUBLE DISPLACEMENT REACTIONDISPLACEMENT REACTIONExplanation:
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Why do you think the mass of the carbon atom shown is 12 atomic mass units (amu)?
Answer:
The mass of Carbon-12 is exactly 12 amu. But, that is not the number that is reported in your periodic table. Carbon as it exists in nature is not all carbon-12. There is some small amount of carbon-13 and even traces of carbon-14 in there. The periodic table reports the average mass of the carbon as it is found in nature, not that of pure carbon-12. The average mass of carbon is slightly heaver than carbon-12, because of the slight amounts of those heaver isotopes of carbon in nature.
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Explanation:
A 18.5-mL sample of a glucose IV solution has a mass of 19.1 g. What is the density of the glucose solution ?
Answer: 1.0324(g/ml)
We have the formula [tex]m = Vd[/tex]
Where m is the mass, V is the volume, and d is the density
Divide both sides by V, we get [tex]d=\frac{m}{V}=\frac{19.1}{18.5} = 1.0324 (g/ml)[/tex]
22. Which of the following is contained only in a eukaryotic cell? A. cell wall
B. nucleus
C. chromosomes
23.Which of the following terms represent the chemical reactions to break down food into simpler compounds in an organism?
A. anabolism
B. catabolism
C. nitrogen cycle
24.What types of molecules are bonded together to form a nucleotide? A. 2 nitrogen bases + 1 sugar
B. 2 sugars + 1 phosphate group
C. 1 nitrogen base + 1 phosphate group + 1 sugar
25.Glucose and oxygen are the two products of photosynthesis A. true
B. false
26.What is the first step in the refining of petroleum? A. cracking
B. drilling
C. distillation
27.When radium-226 (atomic number 88) decays by emitting an alpha particle, it becomes _________.
A. polonium-222 B. polonium-224 C. radon-222
28.The general name for hydrocarbons with at least one triple covalent bond is _________.
A. alkenes B. alkanes C. alkynes
29.What particle is emitted in alpha radiation? A. electron
B. photon
C. helium nucleus
30.Which type of compound is this? CH3CH2CH2CH2OH
A. alcohol B. aldehyde C. ether
31.Why are the molecules of hydrocarbons nonpolar? A. The intermolecular attractions are strong.
B. All the bonds are single covalent bonds.
C. The electron pair is shared almost equally in all the bonds.
32. An amino group and a carboxyl group are joined by a ___________ bond. A. peptide
B. protein
C. amino
33.What type of radiation is likely to occur when the ratio of protons to neutrons is below the band of stability?
A. alpha decay
B. beta decay
C. neutron emission
34.Covalent bonds are between bases in a DNA base-pair. A. true
B. false
35.What is the name of the functional group in the following compound? R—NH2
A. halogen B. amine C. ether
Answer:
22 options A cell wall
23 options A anabolism
24 options B 2sugar + 1phosphate group
which is the best interpretation of the two flat portions of the graph
A. These show where kinetic energy is increased
B. These show where temperature is at 0 Celsius
C. These show where thermal energy does not exist
D. These show were changes of state are occurring
Answer:
b
Explanation:
Iron has a density of 7.86 g/cm3. Calculate the volume (in dL) of a piece of iron having a mass of 4.59 kg .
Which isotope of iron from the periodic table is most abundant
Answer:
Iron has four naturally-occurring stable isotopes, 54Fe, 56Fe, 57Fe and 58Fe. The relative abundances of the Fe isotopes in nature are approximately 54Fe (5.8%), 56Fe (91.7%), 57Fe (2.2%) and 58Fe (0.3%).
a mixture , the different parts of which vary in composition and properties
Answer:
heterogeneous mixture
Explanation:
(a) A mixture with the same composition and properties throughout is called a homogeneous mixture. (b) A mixture, the different parts of which vary in composition and properties, is called a heterogeneous mixture.
Which statement about an atom is correct? (1 point)
O The proton has no charge and is found in the nucleus.
O The neutron has no charge and is found outside of the nucleus.
O The neutron has a negative charge and is found in the nucleus.
o The electron has a negative charge and iş found outside of the nucleus.
Answer:
D. the electron has a neg. charge and is found outside of the nucleus.
Explanation:
the proton has a positive charge, while the neutron has no charge at all. both are found in the nucleus.
the electron has a negative charge, but stays outside of the nucleus in the electron cloud, constantly moving around.
Taking into account the constitution of an atom, the correct statement is "The electron has a negative charge and iş found outside of the nucleus."
An atom is the smallest constituent unit of ordinary matter that has the properties of a chemical element.
Every atom consists of:
A nucleus in which neutrons and protons meet. Energy levels where electrons are located.In other words, the atomic nucleus is the central part of the atom that is made up of protons and neutrons, while the orbitals or peripheral region is an area where electrons are found.
The neutron is an electrically neutral subatomic particle, while the proton has a positive electrical charge. Electrons have a negative charge, move around the nucleus at different energy levels and are attracted to protons, positive in the atom through electromagnetic force.
In summary, the correct statement is "The electron has a negative charge and iş found outside of the nucleus."
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Answer:
A toxic, green, gaseous chemical element (symbol Cl) with an atomic number of 17.
1How do you calculate magnification on a light microscope?
According to the molecular orbital theory how many molecular orbitals are formed when six p-orbitals of benzene combine?A) 6B) 5C) 4D) 3E) 2
there are 6 orbitals are formed when six p- orbitals of benzene combine.
0.5 mole of Na2SO4 x 10 H2O consists of what
Answer:
» It contains two atoms of sodium sulphate
» It contains 10 molecules of water.
The volume of real gas will change if “P” increases upto 500 atm and temperature decrease upto 0°C A. Volume increases by 0.05% B. Volume decreases by 0.05% C. Volume increases 20% D. Vol decreases 20%
We have that The volume of real gas will change if “P” increases upto 500 atm and temperature decrease upto 0°C there will be
. Volume decreases by 0.05%
OPtion B
From the question we are told that
if “P” increases upto 500 atm
temperature decrease upto 0°C
Generally the equation for the ideal gas equation is mathematically given as
P=\frac{nRT}{V}
Where
n=1
R=0.08
Therefore
The volume is directly proportional to temperature
Therefore
. Volume decreases by 0.05%
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lidocain có tính bazơ không
Answer:
Lidocain là cơ bản.
Tôi hy vọng câu trả lời của tôi là hữu ích cho bạn.
Diagram 1 shows the species of carnivore animal. (tiger)
What is the use of canine teeth for the animal?
a. Tear food
b. grind food
c. cut food
d. chewing and crushing food
Answer:
a no. because tearing the raw meat will not be easy without the use of the canine teeth
Which functional group does the molecule below have?
A. Ether
B. Amino
C. Carbonyl
D. Hydroxyl
SUBV
Answer:
Ether is the correct answer
Explanation:
It is based.
In this question you should assume that all gases behave ideally.
Hydrogen and iodine react reversibly in the following reaction. The system reaches dynamic
equilibrium.
H2(g) + I2(g) 2HI(g) ∆H=–9.5kJmol–1 Which statement must be true for the Kp of this equilibrium to be constant?
A The partial pressures of H2, I2 and HI are equal.
B The external pressure is constant.
C The forward and reverse reactions have stopped.
D The temperature is constant.
Answer:
B
Explanation:
The number of moles of each reactant is equal, there by pressure has no effect on the chemical system. Pressure is constant
Write the chemical symbols for three different atoms or atomic cations with 11 electrons.
Three ways to represent atoms or atomic cations with 11 electrons include :
[tex] {Mg}^{ + } \: {Al}^{2 + } \: {Si}^{3 + } [/tex]
Mg = magnesium has 12 electrons in its neutral state, when it loses one electron to attain stability, it's election becomes 11.
Al = Aluminum has 13 electrons in its neutral state, when it donates 2 electron to attain stability, it becomes (13 - 2). = 11
Si = Silicon has 14 electrons on it's neutral state, when it loses 3 electrons to attain stability, we have (14 - 3) = 11
Hence,
[tex]{Mg}^{ + } \: {Al}^{2 + } \: {Si}^{3 + } [/tex]
are atomic cations with 11 electrons.
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PLEASE SOLVE THIS QUESTION.
VERY MUCH IMPORTANT
Answer:
[tex]thank \: you[/tex]
draw a diagram to show what happened to the particle, when a liquid cools to a solid?
And do follow if you appreciate it
All of the following are examples of simple tools except:
A.magnifying glass
B.space telescope
C.pulley
D.lever
Answer:
space telescope I assume
Explanation:
all other tools can be made and used very easily but a telescope took years and years to invent
