Answer:
its A and D
Explanation:
i took the quiz
Answer:
a and d
Explanation:
____ Al + ____ Cr2O3 ____ Al2O3 + ____ Cr
If the reaction of 23.3 grams of Cr2O3 produces 5.35 grams
of Al2O3, what is the percent yield?
Answer:
[tex]Y=34.3\%[/tex]
Explanation:
Hello there!
In this case, according to the balanced chemical reaction:
[tex]2Al + Cr_2O_3 \rightarrow Al_2O_3 + 2Cr[/tex]
We notice there is a 1:1 mole ratio between Al2O3 and Cr2O3; thus, the following stoichiometric setup is used to compute the theoretical yield first:
[tex]m_{Al_2O_3 }=23.3gCr_2O_3*\frac{1molCr_2O_3}{151.99gCr_2O_3} *\frac{1molAl_2O_3}{1molCr_2O_3} *\frac{101.96gAl_2O_3}{1molAl_2O_3} \\\\m_{Al_2O_3}=15.6gAl_2O_3[/tex]
Thus, the percent yield turns out:
[tex]Y=\frac{5.35g}{15.6g} *100\%\\\\Y=34.3\%[/tex]
Best regards!
The formula unit is the representative particle for what?
Answer:
The representative particle of an ionic compound is the formula unit. A formula unit uses a formula to calculate the basic whole number ratio of the ions in an ionic compound.
Explanation:
HAHAH I'm not sure
How many grams are there in a 3.5 moles of oxygen
Answer:
112 of O2
Explanation:
Now if simply oxygen is given so we'll consider O2
3.5 moles O2 means,
3.5 x 32 = 112 grams of O2
Considering the definition of molar mass, the mass of 3.5 moles of O₂ is 112 grams.
Definition of molar massThe molar mass of substance is a property defined as its mass per unit quantity of substance, in other words, molar mass is the amount of mass that a substance contains in one mole.
The molar mass of a compound (also called Mass or Molecular Weight) is the sum of the molar mass of the elements that form it (whose value is found in the periodic table) multiplied by the number of times they appear in the compound.
Molar mass of O₂In this case, you know the molar mass of the oxygen O is 16 g/mole.
So, the molar mass of the compound O₂ is calculated as:
O₂= 2× 16 g/mole
Solving:
O₂= 32 g/mole
Mass of 3.5 moles of O₂Next, you can apply the following rule of three: If by definition of molar mass 1 mole of the compound contains 32 grams, 3.5 moles of the compound contains how much mass?
[tex]mass= \frac{3.5 molesx32 grams}{1 mole}[/tex]
mass= 112 grams
Finally, the mass of 3.5 moles of O₂ is 112 grams.
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Please help me answer this question I need it before 12:59
Answer:
because the brian is like a computer because that both use electrical signals to send messages the brain uses chemicals to transmit information and the computer uses electricity.
Hope that was helpful
what Is the molar mass of H2O
Answer:
18.01528 g/mol
Explanation:
Answer:
18.01528 g/mol
Explanation:
How many atoms are in 4.5 moles of nitrogen
Answer:one mole of stuff (atoms, molecules, eggses), there are NA individual items of that stuff. So, there are 4.5 × NA BCl3 molecules; i.e. 4.5 × 6.022×1023 ≅ 27×1023 individual molecules of BCl3
Explanation:
Answer:
[tex]\boxed {\boxed {\sf About \ 2.7 *10^{24}\ atoms\ N }}[/tex]
Explanation:
To convert from moles to atoms, Avogadro's Number: 6.022*10²³ must be used. This number tells us the amount of particles (atoms, molecules, etc) in 1 mole of a substance. In this case, the particles are atoms of nitrogen.
[tex]\frac {6.022 *10^{23} \ atoms \ N}{1 \ mol \ N}[/tex]
Multiply by the given number of moles: 4.5
[tex]4.5 \ mol \ N *\frac {6.022 *10^{23} \ atoms \ N}{1 \ mol \ N}[/tex]
The moles of nitrogen will cancel.
[tex]4.5 \ *\frac {6.022 *10^{23} \ atoms \ N}{1 }[/tex]
The denominator of 1 can be ignored.
[tex]4.5 \ *{6.022 *10^{23} \ atoms \ N}[/tex]
[tex]2.7099*10^{24} \ atoms \ N[/tex]
The original measurement of moles had 2 significant figures, so our answer must have the same. For the number we calculated, that is the tenth place. The 0 in the hundredth place tells us to leave the 7.
[tex]2.7 *10^{24}\ atoms\ N[/tex]
There are about 2.7*10²⁴ atoms of nitrogen in 4.5 moles.
Can some one help I'm lost iam being timed:( Show using two conversion factors how you would convert from 0.020 kg into mg
Answer:
2.0 × 10⁴ mg
Explanation:
Step 1: Given data
Mass (m): 0.020 kg
Step 2: Convert the mass from kilograms to grams
We will use the conversion factor 1 kg = 1,000 g.
0.020 kg × (1,000 g/1 kg) = 20 g
0.020 kg is equal to 20 g.
Step 3: Convert the mass from grams to milligrams
We will use the conversion factor 1 g = 1,000 mg.
20 g × (1,000 mg/1 g) = 2.0 × 10⁴ mg
20 g is equal to 2.0 × 10⁴ mg. Then, 0.020 kg is equal to 2.0 × 10⁴ mg.
What is half-life?
Half the life of an organism
The time it takes for the radioactivity of a specific isotope to fall to half its original value
The time it takes for a geologist to determine the age of a rock or mineral
The length and organism lived in prehistoric times
Answer:
The time it takes for the radioactivity of a specific isotope to fall to half its original value
Explanation:
The half time is the time it takes for the radioactivity of a specific isotope to fall to half its original value.
What is half-life?In terms of radioactivity, it is the interval of time that should be needed for one half of the atomic nuclei with respect to the radioactive sample for decaying or here the time interval should be needed for the no of disintegrations per second of a radioactive
Therefore, based on the above explanation, the third option is correct.
And, the rest of the options are wrong.
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What is largest and most polluted city in the Western Hemisphere?
Answer:
Califonia
Explanation:
PLS THIS IS DUE TODAY HELP ME LOOK AT THE PIC. like i beg you pls.
Answer:
kinetic energy is that form of mechanical energy that has been released and is associated with the body in motion.
Explanation:
My best answer
Which of the following is a weak base?
A. KOH (potassium hydroxide)
B. NaOH (sodium hydroxide)
C. NH3 (ammonia)
D. LiOH (lithium hydroxide)
Answer:
C.NH3(ammonia) is Answer.
Explanation:
I hope it's helpful!
Answer:
NH3 (Ammonia)
Explanation:
Help me please!!!
Answer the following question:
A student wants to make a 2.50 M aqueous solution of silver nitrate, AgNO3 and has a bottle containing 21.89 g of silver nitrate. What should be the final volume of the solution?
Find the numerical answer for this question and make sure to include the following:
What is the formula for molarity?
What is the molar mass for silver nitrate?
When you give your numerical answer, what is the correct significant figures and how do you know that is the correct amount?
Answer:
0.052L
Explanation:
Molarity of a substance, which refers to the molar concentration, is calculated as follows:
Molarity (M) = number of moles (mol) ÷ volume (L)
Mole = mass ÷ molar mass
Molar Mass of AgNO3 since Ag = 108, N = 14, O = 16
108 + 14 + 16(3)
= 108 + 14 + 48
= 170g/mol
Mole = 21.89 g ÷ 170g/mol
Mole = 0.129moles
Using Molarity (M) = number of moles (mol) ÷ volume (L)
Volume = number of moles ÷ molarity
V = 0.129 ÷ 2.50
V = 0.0516
To the correct significant figure i.e. 4s.f, the numerical value of volume = 0.052L
define chemical reactions and the types
Answer:
i gtg soon baby ok?
Explanation:
5 points
This type of tissue brings messages back and forth from the brain to the
rest of the body
epithelial tissue
muscle tissue
nervous tissue
connective tissue
The decomposition of solid barium nitrate leads to the formation of solid barium oxide, diatomic nitrogen gas, and diatomic oxygen gas. Write a formula equation for the reaction.
Answer:
Ba(NO₃)₂(s) ⇒ BaO(s) + N₂(g) + 3 O₂(g)
Explanation:
Let's consider the unbalanced equation for the decomposition reaction of solid barium nitrate.
Ba(NO₃)₂(s) ⇒ BaO(s) + N₂(g) + O₂(g)
We can see that Ba atoms and N atoms are balanced, but we have 6 O atoms to the left side and 2 O atoms to the right. We can get the balanced equation by multiplying O₂(g) by 3.
Ba(NO₃)₂(s) ⇒ BaO(s) + N₂(g) + 3 O₂(g)
Hydrogen gas is a product of the reaction of
magnesium with hydrochloric acid. How many
liters of hydrogen gas are produced from the
complete reaction of 146.5 g magnesium metal at
2.40 atm and a temperature of 314 K?
(Mg = 24.30 g/mol)
Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g)
Hint: R = 0.0821 L atm/(mol K)
Answer:
64.7
Explanation:
Answer:
64.7 is the answer
hope this helps
have a good day :)
Explanation:
A boundary formed when two plates collide
What boundary forms when two plates collide
Answer:
If two tectonic plates collide, they form a convergent plate boundary. Usually, one of the converging plates will move beneath the other, a process known as subduction. ... Most divergent plate boundaries are underwater and form submarine mountain ranges called oceanic spreading ridges
Explanation:
Hope this helps
in coca cola the ingridents are : CARBONATED WATER.
HIGH FRUCTOSE CORN SYRUP.
CARAMEL COLOR.
PHOSPHORIC ACID.
NATURAL FLAVORS.
CAFFEINE. my question is that is the caffienne turning it black or the carmel coler
Answer:
Coca-Cola (and other Colas) are dark because food colouring is added to the mixture (caramel colour) to create the traditional colour of colas.
Today we still colour our colas this way, because of tradition: That is the colour colas are supposed to be.
Explanation:
Which of these are associated with the solar wind? Check all that apply.
produces tides
disrupts communication systems
composed of charged particles
travels at about 400 km/s
explains changes in the weather
help nowwwww
Answer:
Disrupts communication systems
Composed of charged particles
travels at about 400 km/s
Answer:
BCD
Explanation:
Compare the reactivity of magnesium and calcium explain the difference
Answer:
Calcium is more reactive than magnesium because calcium atom is larger than magnesium atom and it has one more energy level. ... Thus Ca is more reactive than Mg.
In a chemical equation, the symbol that takes the place of the words reacts with is an) Example HCI + KOH-KCI + H2O
O equal sign
O coefficient
O plus sign
O arrow
Answer: c plus sign
Explanation:
The symbol that is used in the reaction is an equal sign, it is put between reactant and product. The correct option is A, an equal sign.
What is a chemical equation?The representation of a reaction in the equation form is known as a chemical equation.
In the given reaction, the hydrochloric acid and potassium hydroxide undergoes a reaction and produce potassium chloride and water.
The reactants and the products are always divided with an arrow or equal sign.
HCI + KOH = KCI + H2O
Thus, the correct option is A, an equal sign.
Learn more about chemical equation
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Three mixtures were prepared from three very narrow molar mass distribution polystyrene samples with molar masses of 10,000, 30,000 and 100,000 g mol−1 as indicated below: (a) Equal numbers of molecules of each sample (b) Equal masses of each sample (c) By mixing in the mass ratio 0.145:0.855 the two samples with molar masses of 10,000 and 100,000 g mol−1 For each of the mixtures, calculate the number-average and weight-average molar masses and comment upon the meaning of the values.
Answer:
(a). 46,666.7 g/mol; 78,571.4 g/mol
(b). 86950g/mol; 46,666.7 g/mol.
(c). 86950g/mol; 43,333.33 g/mol
Explanation:
So, we are given the molar masses for the three samples as: 10,000, 30,000 and 100,000 g mol−1.
Thus, the equal number of molecule in each sample = ( 10,000 + 30,000 + 100,000 ) / 3 = 46,666.7 g/mol.
The average molar mass = [ ( 10,000)^2 + (30,000)^2 + 100,000)^2] ÷ 10,000 + 30,000 + 100,000 = 78,571. 4 g/mol.
(b). The equal masses of each sample = 3/[ ( 1/ 10,000) + (1/30,000 ) + (1/100,000) ] = 20930.23 g/mol.
Average molar mass = ( 10,000 + 30,000 + 100,000 ) / 3 = 46,666.7 g/mol.
(c). Equal masses of the two samples = (0.145 × 10,000) + (0.855 × 100,000)/ 0.145 + 0.855 = 86950g/mol.
The weight average molar mass = 1.7 + 10,000 + 100,000/ 1.7 + 1 = 43,333.33 g/mol.
The name of the chemical reaction
Answer: C6H12O6 + 6O2 -> 6CO2 + 6H2O. Yields 2755 kJ/mole of glucose. The reverse of this reaction – combing carbon dioxide and water to make sugar – is known as photosynthesis. Photosynthesis is the process responsible for storing all the energy we extract from fossil fuels, crops, and all of our food.
Is rusting of an iron exothermic or endothermic event if the nail is the system?
exothermic or endothermic?
Answer:
exotherimc reaction
Explanation:
:)
Answer:
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What is always true of a weak base?
A. Some of the original base remains in solution.
B. It has been diluted with water.
C. It does not dissolve or dissociate in water.
D. It contains hydroxide ions.
Answer:
A. Some of the original base remains in solution
Explanation:
A P E X
Wine goes bad soon after opening because the ethanol dissolved in it reacts with oxygen gas to form water and aqueous acetic acid , the main ingredient in vinegar. Calculate the moles of acetic acid produced by the reaction of of oxygen. Be sure your answer has a unit symbol, if necessary, and round it to the correct number of significant digits.
Answer:
1.70 mol
Explanation:
Wine goes bad soon after opening because the ethanol dissolved in it reacts with oxygen gas to form water and aqueous acetic acid, the main ingredient in vinegar. Calculate the moles of acetic acid produced by the reaction of 54.4 g of oxygen. Be sure your answer has a unit symbol, if necessary, and round it to the correct number of significant digits.
Step 1: Write the balanced equation
CH₃CH₂OH + O₂ ⇒ CH₃COOH + H₂O
Step 2: Calculate the moles corresponding to 54.4 g of O₂
The molar mass of O₂ is 32.00 g/mol.
54.4 g × 1 mol/32.00 g = 1.70 mol
Step 3: Calculate the moles of CH₃COOH produced by the reaction of 1.70 moles of O₂
The molar ratio of O₂ to CH₃COOH is 1:1. The moles of CH₃COOH produced are 1/1 × 1.70 mol = 1.70 mol.
A careless student forgets to label one of their reagent containers. They know it contains one of the following solutions: 0.1 M NaCl 0.1 M Ca(NO3)2 0.1 M KCH3COO The student decides to add some 0.1 M Pb(NO3)2 to a sample of the reagent in question. Upon stirring, a white precipitate formed. Which of the possible solutions is present in the unlabeled container based on this observation?
A. 0.1 M KCH3COO
B. 0.1 M Ca(NO3)2
C. 0.1 M NaCl
Answer:
0.1 M NaCl
Explanation:
This question reminds of of the solubility rules. Let us recall that all chlorides are soluble except those of lead, mercury II and silver which are insoluble in water.
The following reaction will occur leading to the formation of a precipitate;
Pb(NO3)2(aq) + 2NaCl(aq) -------> 2NaNO3(aq) + PbCl2(s)
The white precipitate formed is PbCl2.
PLEASE HELP IN ONE MINUTE WILL MARK BRAINLIST
The freezing point is 18° C
3. What is pNa for a solution of 1.76 x 10-3 M
Na3PO4?
I think it is Concentration
What volume of oxygen (in L) is produced
from the complete reaction of 147.1 g of
lead(II) nitrate at STP?
(Pb = 207.2 g/mol, N = 14.01 g/mol, O = 16.00 g/mol)
2Pb(NO3)2(g) → 2PbO(s) + 4NO2(g) + O2(g)
Hint: 1 mole of gas at STP occupies 22.4L
Answer:
12.36 L.
Explanation:
We'll begin by calculating the number of mole in 147.1 g of lead(II) nitrate, Pb(NO₃)₂. This can be obtained as follow:
Molar mass of Pb(NO₃)₂ = 207.2 + 2[14.01 + (16×3)]
= 207.2 + 2[14.01 + 48]
= 207.2 + 2[62.01]
= 207.2 + 124.02
= 331.22 g/mol
Mass of Pb(NO₃)₂ = 147.1 g
Mole of Pb(NO₃)₂ =?
Mole = mass / Molar mass
Mole of Pb(NO₃)₂ = 147.1 / 331.22
Mole of Pb(NO₃)₂ = 1.104 moles.
Next, we shall determine the number of mole of oxygen gas, O₂, produce from the reaction. This can be obtained as follow:
2Pb(NO₃)₂ —> 2PbO + 4NO₂ + O₂
From the balanced equation above,
2 moles of Pb(NO₃)₂ decomposed to produce 1 mole of O₂.
Therefore, 1.104 moles of Pb(NO₃)₂ will decompose to produce = (1.104 × 1)/2 = 0.552 mole of O₂.
Finally, we shall determine the volume occupied by 0.552 mole of oxygen gas, O₂. This can be obtained as follow:
1 mole of O₂ occupied 22.4 L at STP.
Therefore, 0.552 mole of O₂ will occupy = 0.552 × 22.4 = 12.36 L at STP.
Thus, the volume of oxygen gas, O₂ produced is 12.36 L.
Answer:
11.9
Explanation:
its the correct answer lol