Answer:
42.61 g of NaOH.
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
2Na + 2H₂O —> 2NaOH + H₂
Next, we shall determine the mass of Na that reacted and the mass of NaOH produced from the balanced equation. This is illustrated below:
Molar mass of Na = 23 g/mol
Mass of Na from the balanced equation = 2 × 23 = 46 g
Molar mass of NaOH = 23 + 16 + 1
= 40 g/mol
Mass of NaOH from the balanced equation = 2 × 40 = 80 g
SUMMARY:
From the balanced equation above,
46 g of Na reacted to produce 80 g of NaOH.
Finally, we shall determine the mass of NaOH produced by the reaction of 24.50 g of Na. This can be obtained as follow:
From the balanced equation above,
46 g of Na reacted to produce 80 g of NaOH.
Therefore, 24.50 g of Na will react to produce = (24.50 × 80)/46 = 42.61 g of NaOH.
Thus, 42.61 g of NaOH were obtained from the reaction.
Consider an element Z that has two naturally occurring isotopes with the following percent abundances: the isotope with a mass number of 19.0 is 55.0% abundant; the isotope with a mass number of 21.0 is 45.0% abundant. What is the average atomic mass for element Z?
Average atomic mass of Z = [mass]
Answer:
Average atomic mass = 19.9 amu
Explanation:
Isotopes can be defined as two or more forms of a chemical element that are made up of equal numbers of protons and electrons but different numbers of neutrons.
Generally, the isotopes of a chemical element have the same chemical properties because of their atomic number but different physical properties due to their atomic weight (mass number).
Given the following data;
Relative abundance of Z-19 = 55%
Relative abundance of Z-21 = 45%
Atomic mass of Z-19 = 19 amu
Atomic mass of Z-21 = 21 amu
To find the average atomic mass;
Average atomic mass = 19 * (55/100) + 21 * (45/100)
Average atomic mass = 19*0.55 + 21*0.45
Average atomic mass = 10.45 + 9.45
Average atomic mass = 19.9 amu
Therefore, the average atomic mass for element Z is 19.9 amu.
Due to the tendency to form crystals instead of discrete molecules the formula unit is the representative particle for ___ compounds
Answer:ionic
Explanation:
*14.
How many atoms of sulfur are in 0.75 moles of carbon disulfide?
How many grams are in 6.60 moles of ZnO?
Answer:
6.60 moles of ZnO have 537,108 g.
Explanation:
Freshwater biomes contain less salt than ocean biomes.
true or false
true...as it gives home to many of the organisms
Consider this reaction mechanism:
Step 1: C4H9Br C4H9+ + Br- (slow)
Step 2: C4H9+ + OH- C4H9OH (fast)
Which rate law is consistent with the mechanism?
Part A
Consider the following neutral electron configurations in which n has a constant value. Which configuration
would belong to the element with the most negative electron affinity, Eea?
View Available Hint(s)
a 2s2
b 2s²2p2
c 2s²2p5
d 2s²2p6
Answer:
c. 2s2 2p5
Explanation:
2s2 2p5 has 7 valence electrons and only needs one electron to complete the octet. This element will be the most electronegative.
Easy Chem, Will Give brainliest
Answer:
3.94 L
Explanation:
From the question given above, the following data were obtained:
Mass of O₂ = 5.62 g
Volume of O₂ =?
Next, we shall determine the number of mole present in 5.62 g of O₂. This can be obtained as follow:
Mass of O₂ = 5.62 g
Molar mass of O₂ = 2 × 16 = 32 g/mol
Mole of O₂ =?
Mole = mass / molar mass
Mole of O₂ = 5.62 / 32
Mole of O₂ = 0.176 mole
Finally, we shall determine the volume of 5.62 g (i.e 0.176 mole) of O₂ at STP. This can be obtained as follow:
1 mole of O₂ occupied 22.4 L at STP.
Therefore, 0.176 mole of O₂ will occupy = 0.176 × 22.4 = 3.94 L at STP.
Thus 5.62 g (i.e 0.176 mole) of O₂ occupied 3.94 L at STP
Match the gas sample with each others.
a. has the highest average molecular speed
b. has the lowest average molecular speed
c. has an average molecular speed between the highest and the lowest
1. _________0.564 moles of Ne in a 5.33 L container at a temperature of 308K
2. _________0.658 moles of Ne in a 2.05 L container at a temperature of 426K
3. _________ 0.128 moles of Ne in a 5.69 L container at a temperature of 426K
4. _________0.322 moles Of Ne in a 4.00 L container at a temperature of 398K
Answer:
a. The gas with the highest average molecular speed is the gas option 3.
b, The gas that has the lowest average molecular speed is the gas option 1.
c. The gas with average molecular speed between the highest and the lowest is the gas sample, option 4
Explanation:
From the kinetic theory of gases we have;
[tex]v_{rms} = \sqrt{\dfrac{3\cdot R\cdot T}{m} }[/tex]
Where;
[tex]v_{rms}[/tex] = The root mean square velocity of the gas
T = Temperature of gas in Kelvin
m = Mass of atom or molecule in kilograms
R = The universal gas constant
Therefore, [tex]v_{rms}[/tex] ∝ T and [tex]v_{rms}[/tex] ∝ 1/m
a. Therefore, the gas with the highest average molecular speed has the highest temperature, 'T', and the lowest mass, 'm', therefore, we have;
The gas with the highest average molecular speed is the gas option 3. with only 0.128 moles of Ne in 5.69 L container at a temperature of 426 K
b. The gas with the lowest average molecular speed has the lowest temperature, 'T', and the highest mass, 'm', therefore, we have;
The gas with the lowest average molecular speed is the gas option 1. with only 0.564 moles of Ne in 5.33 L container at a temperature of 308 K
c. The gas with an average molecular speed between the highest and the lowest is the gas with intermediate temperature and mass within the given gas samples
Therefore, the gas with the average molecular speed between the highest and lowest is the gas option 4. with 0.322 moles of Ne in 4.00 L container at a temperature of 398 K
give the name of the method used to extract aluminium
PLEASE HELP I WILL MARK BRAINLIEST!
In a forest, lynx prey on rodents and birds in the summer. But because of rising temperatures, the birds in the forest have migrated to a cooler place. What effect will this migration have on the population of the rodents?
Because there are fewer birds, the lynx will prey on rodents, leading to a BLANK in their population. This scenario depicts BLANK competition.
Blank 1:
decline
rise
stagnancy
Blank 2:
apparent
direct
intraspecific
Answer:
The answer is decline and apparent
Explanation:
I took the test and got it right
Which of the following organisms carry out photosynthesis?
3. Consider the reaction of methane, CH4, burning in the presence of oxygen at constant pressure. Given the following equation, how much heat could be obtained by the combustion of 8.0 grams CH4? Given the thermochemical equation: CH4(g)+2O2→CO2(g)+2H2O(l); ΔH0=890.3kJ;
Answer: 445.15 kJ of heat could be obtained by the combustion of 8.0 grams [tex]CH_4[/tex]
Explanation:
To calculate the moles :
[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex]
[tex]\text{Moles of} CH_4=\frac{8.0g}{16.04g/mol}=0.50moles[/tex]
The given thermochemical equation is:
[tex]CH_4(g)+2O_2(g)\rightarrow CO_2(g)+2H_2O(g)[/tex] [tex]\Delta H=890.3kJ[/tex]
According to stoichiometry :
1 mole of [tex]CH_4[/tex] on combustion produce heat = 890.3 kJ
Thus 0.50 moles of [tex]CH_4[/tex] on combustion produce heat =[tex]\frac{890.3}{1}\times 0.50=445.15kJ[/tex]
Thus 445.15 kJ of heat could be obtained by the combustion of 8.0 grams [tex]CH_4[/tex]
What is the second most consume grain in the world?
Answer:
Wheat!
Explanation:
Corn ranks first, Wheat, then Rice!
10-14 is smaller than 107
Answer:
it is true because if you subtract 10 - 14 you will get -4 so it is less than 107.
Explanation:
Hope this helps!
which part of the red blood cells can you find hemoglobin
Answer:
The cytoplasm of erythrocytes is rich in hemoglobin, an iron-containing biomolecule that can bind oxygen and is responsible for the red color of the cells and the blood. Each human red blood cell contains approximately 270 million of these hemoglobin molecules.
Explanation:
hope this helps(;
1.5 atm is the same pressure as... (1 atm
760 mmHg)
1100 mmHg
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Gas Laws
PressureStoichiometry
Using Dimensional AnalysisExplanation:Step 1: Define
[Given] 1.5 atm
[Solve] mmHg
Step 2: Identify Conversions
1 atm = 760 mmHg
Step 3: Convert
[DA] Set up: [tex]\displaystyle 1.5 \ atm(\frac{760 \ mmHg}{1 \ atm})[/tex][DA] Multiply/Divide [Cancel out units]: [tex]\displaystyle 1140 \ mmHg[/tex]Step 4: Check
Follow sig fig rules and round. We are given 2 sig figs.
1140 mmHg ≈ 1100 mmHg
What energy is using the telephone?
1.electrical
2.sound
3.thermal
4.light
5.mechanical
Answer:
electrical
Explanation:
i kinda guessed.
Answer:
electrical energy is changed into sound energy
Use the following equation to answer the questions below:
Be + 2HCl → BeCl2 + H2
Answers are rounded.. pick the closest to your answer.
What is the mass of beryllium required to produce 25.0g of beryllium chloride? g
What is the mass of hydrochloric acid required to produce 25.0g of beryllium chloride? g
What is the mass of hydrogen gas produced when 25.0g of beryllium chloride is also produced? g
Explanation:
The equation of the reaction is given as;
Be + 2HCl → BeCl2 + H2
What is the mass of beryllium required to produce 25.0g of beryllium chloride?
1 mol of Be produces 1 mol of BeCl2
Converting to mass;
Mass = Molar mass * Number of moles
9.01g of Be produces 79.92g of BeCl2
xg of Be produces 25g of BeCl2
Solving for x;
x = 25 * 9.01 / 79.92
x = 2.82 g
What is the mass of hydrochloric acid required to produce 25.0g of beryllium chloride? g
Converting 25.0g of beryllium chloride to moles;
Number of moles = Mass / Molar mass
Number of moles = 25 / 79.92 = 0.3128 mol
2 mol of HCl produces 1 mol of BeCl2
x mol of HCl would produce 0.3128 mol of BeCl2
solving for x;
x = 0.3128 * 2 = 0.6256 mol
Converting to mass;
Mass = 0.6256 * 36.5 = 22.83 g
What is the mass of hydrogen gas produced when 25.0g of beryllium chloride is also produced? g
25g of BeCl2 = 0.3128 mol of BeCl2
From the equation;
1 mol of H2 is produced alongside 1 mol of BeCl2
This means;
0.3128 mol of H2 would also be produced alongside 0.3128 mol of BeCl2
Mass = Number of moles * Molar mass
Mass = 0.3128mol * 2.0159 g/mol = 0.6306 g
Brenda creates an animation that tells the story of a metal from when it is mined as an ore to when it is used as a shiny, protective coating on a car’s iron bumper.
Which two terms will Brenda most likely use in her animation, and in what order?
“electrometallurgy” followed by “electroplating”
“electrometallurgy” followed by “anodization”
“anodization” followed by “electroplating”
“electroplating” followed by “electrometallurgy”
Answer: A. “electrometallurgy” followed by “electroplating”
Explanation:
Right on edge :)
Answer:
It would be A. “electrometallurgy” followed by “electroplating”
Explanation:
Electrometallurgy is the reduction of metals from compounds to obtain the pure form of metal using electrolysis. In other words, a process in which ores are converted into the pure form of that certain metal through electrolysis.
Electroplating is a process of depositing a thin layer of metal onto an object in an electrolytic cell for strengthening or decorative purposes.
Also in case you are wondering, anodization is a process that makes the surface of metals resistant to corrosion, making the answers containing this process incorrect.
Hope this helps!
I would appreciate brainliest :)
How can we identify patterns of volcanic eruptions?
make a prediction about the relationship between electrons and molecular shapes
Answer:
★ Molecular geometry is described by VSEPR theory, which basically states that electron pairs around a central atom will repel each other, and get as far apart as possible, in three dimensions.
Explanation:
Hope you have a great day :)
How is conservation of mass illustrated in this simulation? Explain your answer.
Answer:
Do part by part
Explanation:
Which two parts of sedimentary rock formation include the breakdown and carrying away of existing rock?
Answer:
Cementation
Erosion
Explanation:
Cementation refers to hardening and welding of those sediments which are formed from preexisting rock fragments as a result of the precipitation of mineral matter in the spaces between the pore. The last stage in the formation of a sedimentary rock is Cementation.
Erosion is the geological process in which soil, rock, or dissolved material are worn away and transported from one location to another location by natural forces such as wind or water.
The two parts of sedimentary rock formation which include the breakdown and carrying away of existing rock are cementation and erosion.
Answer: The answer is A: Cementation and Erosion
Explanation: Hope this helps! happy new year
This
Part A
A sample of ideal gas at room temperature occupies a volume of 21.0 L at a pressure of 712 torr. If the pressure changes to 3560 torr , with no change in
the temperature or moles of gas, what is the new volume, V?
Express your answer with the appropriate units.
View Available Hint(s)
HÅ
?
of 1
V2 =
Value
Units
Submit
Answer:
4.2 Liters (2 sig-figs)
Explanation:
Apply Boyles Law ... P₁V₁ = P₂V₂
P₁ = 712 Torr P₂ = 3560 Torr
V₁ = 21.0L V₂ = ?
P₁V₁ = P₂V₂ => V₂ = P₁V₁/P₂ = (712Torr)(21.0L)/(3560Torr) = 4.2 Liters (2 sig-figs)
Calculate the mass of chromium produced from 50g of Cr2O3.
Answer: 34 gram of chromium produced from 50g of [tex]Cr_2O_3[/tex]
Explanation:
To calculate the moles :
[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex]
[tex]\text{Moles of} Cr_2O_3=\frac{50g}{152g/mol}=0.33moles[/tex]
The decomposition of [tex]Cr_2O_3[/tex] follows the equation :
[tex]2Cr_2O_3\rightarrow 4Cr+3O_2[/tex]
According to stoichiometry :
2 moles of [tex]Cr_2O_3[/tex] produce = 4 moles of [tex]Cr[/tex]
Thus 0.33 moles of [tex]Cr_2O_3[/tex] will produce=[tex]\frac{4}{2}\times 0.33=0.66moles[/tex] of [tex]Cr[/tex]
Mass of [tex]Cr=moles\times {\text {Molar mass}}=0.66moles\times 52g/mol=34g[/tex]
Thus 34 gram of chromium produced from 50g of [tex]Cr_2O_3[/tex]
Name an example of a molecule
Answer:
N2 (nitrogen) O3 (ozone) CaO (calcium oxide) C6H12O6 (glucose, a type of sugar)
Answer:
dihydrogen monoxide
dinitrogen monosulfide
What are the reactants in the following reaction?
2FeS + 302 → 2FeO + 2502
iron (II) sulfide and oxygen
iron (II) sulfide and iron (II) oxide
oxygen and sulfur dioxide
iron (11) oxide and sulfur dioxide
Answer:
Iron (II) sulfide and oxygen
Which element has the highest (most negative) electron affinity?
Ne, S,Na, Be, or Fe?
Answer:
S (Sulfur)
Explanation:
Electronegativity increases as you go up and right on the periodic table, excluding the noble gases on the rightmost column because they have zero electronegativity. S is the farthest right out of all the elements listed in the question excluding Ne.
When a metal reacts with oxygen gas what is the product formed
Answer:
Metal + Oxygen -> Metal Oxide
Explanation:
It's pretty self-explanatory. However, let me show you an example:
Iron + Oxygen -> Iron Oxide
Iron rusts. When iron rusts, it comes in contact with air to form Iron Oxide, which is rust itself.