Answer:
A (2.475 mol O2). B (11.35 g) C. (.4875 mol O2)
Explanation:
A.
convert 25.9 g C4H10 (68g/mol) to mol. --> .3808 mol
then use mole ratios from equation
.3808 mol C4H10 x (13 mol O2 / 2 mol C4H10). ---> 2.475 mol O2
B.
convert 22.2 g CO2 (44g/mol) to mol. ---> .5045 mol
.5045 mol CO2 x (10 mol H2O / 8 mol CO2) ----> .6306 mol H2O
convert .6306 mol to g ----> 11.35 g
C.
.3 mol CO2 x (13 mol O2 / 8 mol CO2) ---> .4875 mol O2
Help me please i am so confused Find The Masses
Aluminum
Copper
Iron
Lead
A green powder was placed into a beaker of water. After it was stirred the water looked cloudy and lumps of powder could still be seen. Has a solution been formed? Explain your answer?
Answer:
it make poisionus police come and took away
A clasping handshake may be used as an analogy for an enzyme-catalyzed reaction because it represents the specific manner in which an enzyme ________.
Answer:
binds to substrate
Explanation:
What happens to the carbon dioxide that the alveoli receive from the blood?
Answer:
it is then exhaled
Explanation:
Carbon dioxide passes from the blood into the alveoli and is then exhaled.
A compound has a percent composition of 15.24% sodium (molar mass
= 22.99 g/mol), 52.95% bromine (molar mass = 79.90 g/mol), and 31.81%
oxygen (molar mass = 16.00 g/mol). Assuming that the mass of the com-
pound is 100 g, what is the compound's empirical formula?
Show all your work. Please use correct formatting for subscripts and exponents.
The math formula editor makes it easier to show work.
This problem is providing us with the percent composition of a compound containing sodium, bromine and oxygen. Thus, the empirical formula is required and found to be NaBrO₃.
Empirical formulasIn chemistry, empirical formulas are used in order to figure out the minimum whole-number representation of a molecular formula, which contains the actual number of atoms.
Thus, we start determining it by assuming the given percentages as masses and calculating the moles with the atomic mass of the involved elements:
[tex]n_{Na}=\frac{15.24}{22.99}=0.700 \\\\n_{Br}=\frac{52.95}{79.90} =0.663\\\\n_O=\frac{31.81}{16.00}=1.99[/tex]
Next, we divide by the 0.633 as the smallest number of moles in order to determine their subscripts in the chemical formula:
[tex]Na:\frac{0.700}{0.663}=1\\ \\Br:\frac{0.663}{0.663}=1\\ \\O=\frac{1.99}{0.663} =3[/tex]
Hence, the empirical formula turns out to be NaBrO₃.
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HELP!! ASAP! GIVING 10 POINTS AND BRAINLIEST!!
What is one reason why transpiration is important in plants?
Question 17 options:
It produces food from the sugar in the plant cells.
It enables the flow of water out of the plant.
It produces carbon dioxide in the leaves of the plant.
Answer:
The Answer Is B.
Explanation:
Give Brainliest.
I have a crush but I don't know how to tell him that I like him what do I do?
Answer:
grab life by the balls and tell him. what harm will it do? you only live once
Answer:
start hanging out with him more
Explanation:
then gradually start giving hints or just ask him striaght up
The molar mass of bismuth (\ce{Bi}BiB, i) is \pu{208.98 g/mol}208.98 g/mol208, point, 98, space, g, slash, m, o, l.
Calculate the mass in grams of a sample of \ce{Bi}BiB, i containing \pu{7.35x10^23}7.35×10
23
7, point, 35, times, 10, start superscript, 23, end superscript atoms.
Identify the solution that is likely to have the greatest concentration of H . Please choose the correct answer from the following choices, and then select the submit answer button. Answer choices orange juice ammonia pure water bleach blood
From what we know, we can confirm that the solution that is likely to have the greatest concentration of H+ is orange juice.
This has to do with the effects of H+ in a substance. The presence of hydrogen ions causes the substance to be more acidic, and the higher the concentration the higher the acidity of the substance. Since orange juice is the only acidic solution listed, we can know it will have the highest concentration of H+ ions.
Therefore, due to its acidic nature, we can confirm that the solution that is likely to have the greatest concentration of H+ is orange juice.
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The time for one cycle of a periodic process is called the:.
Answer:
Period
Explanation:
I believe your answer should be period.
I hope it helps! Sorry if it didn’t… Have a great day!
Layla~
Help!! Hurry!! I will mark brainliest if you get it correct. NO SPAM!!!!!!
Write the alpha decay equation for the following isotope:
211/84 PO
Answer:
216/84 Po + 4/2 He a
Explanation:
Answer:
Problem: Polonium-210, 210Po, decays to lead-206, 206Pb, by alpha emission according to the equation 21084Po → 20682Pb + 42He
Explanation:
what is marble formed from A. obsidian B. granite C. limestone
Answer:
I'm pretty sure its C. limestone.
Organisms that live in the water (ocean, rivers, intertidal zones) must be adapted for changing conditions. Describe at least one (1) adaptation that organisms living in an aquatic ecosystem might have and how it helps the organism to survive.
One adaptation that organisms living in an aquatic ecosystem might have is the ability to regulate their salt concentration.
What are organism?Organisms are living species that live on the planet earth.
There are types of organisms categorized by the environment they live.
Organism that can survive only in water is called an aquatic organism.
We have,
One adaptation that organisms living in an aquatic ecosystem might have is the ability to regulate their salt concentration.
Aquatic environments can have varying levels of salinity, and some organisms need to maintain a specific salt concentration in their bodies to survive.
For example, marine fish have kidneys that can produce very concentrated urine to prevent them from losing too much salt in their surroundings, while freshwater fish have specialized cells in their gills that actively pump salt out of their bodies to maintain the appropriate balance.
Similarly,
Some marine invertebrates, such as crabs and mussels, can regulate the amount of salt they take in by actively transporting ions across their gills or other specialized structures.
This adaptation helps the organism to maintain the proper fluid balance and avoid dehydration or over-hydration, which can be lethal.
Thus,
One adaptation that organisms living in an aquatic ecosystem might have is the ability to regulate their salt concentration.
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How does mixing hydrogen peroxide and water test the reactivity of catalase?.
Hydrogen peroxide is not the chemical causing the reaction.
Chemical ReactionGenerally,Catalyses is an enzyme which breaks H2O2 into H2O and O2. there will be no reaction if we combine H2O with H2O2,
H2O2 receives dissolved in water except displaying any reaction. So they are used as bad manipulate in the test.
Therefore, it shows that hydrogen peroxide is not the chemical causing the reaction
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An event happens that decreases the number of earthworms, spiders, and insects in an area. How would you expect the event to affect to the number of long-billed curlews in the same area? (1 point) O It would not be affected. O It would stay the same. 0 It would increase. It would decrease.
Long-billed curlews feed on insects and worms mainly. Thus, their population will drastically reduce if there is a decrease in their food availability.
Factors affecting the population of organismsOne of the factors that affect the population size of a species is food availability.
Inadequate food increases intraspecies competition and results in more deaths. This leads to a reduction in the population size.
Long-billed curlews are a species of bird that feeds on insects and worms when inland. If an event leads to a decrease in the number of earthworms, spiders, and insects in an area, this will greatly reduce the population of long-billed curlews.
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10.
What are the products of a neutralization reaction?
an acid and a base
a salt and water
a salt and an acid
water and a base
Answer:
Salt and water
Explanation:
The reaction of an acid and a base forming a salt and water.
Which statement best describes the movement of energy?.
Another question. What is an example of a chemical change?
Answer:
Yellowing of leaves
Explanation:
Involves the colour change in leaves whereby less amount of chlorophyll is produced
Answer:
burning, cooking, milk becoming curd, rusting of iron
Dominique goes to the doctor for bone aches. The doctor tells him
that Vitamin D helps his body take in the Calcium for his bones.
Explain why the doctor tells Dominique to do more outdoor activities.
Answer:
sun gives you vitamin D
Explanation:
Our body creates vitamin D from direct sunlight on our skin when we're outdoors.
On a summer day early in the moming, a balloon is filled with helium when the temperature
is 21°C, but the temperature will reach a peak of 46°C later in the day. The balloon holds 12.8 L of helium gas at a starting pressure of 239 kPa. The balloon will burst when the internal pressure (Pb) reaches 256 kPa. Answer the following questions and show your
work
1. How many moles of helium gas are in the balloon?
2. What will the gas pressure be in the balloon at the peak temperature?
3. Will the balloons burst when the temperature reaches 42 degrees Celsius? Explain.
4. To what pressure should the helium gas pressure be reduced to avoid bursting the balloon? (Assume no significant volume change of the balloon)
Any help I’d great! Equations are not my strong suit
Based on the data provided;
number of moles of helium gas is 1.25 molespressure at peak temperature is 259.3 kPainternal pressure is above 256 kPa, therefore, the balloon will burst.pressure should be reduced to a value less than 256 kPa by reducing the temperatureWhat is the ideal has equation?The ideal gas equation relatesthe pressure, volume, moles and temperature of a gas.
The moles of helium gas is calculated using the Ideal gas equation:
PV = nRTn is the number of moles of gas
R is molar gas constant = 8.314 L⋅kPa/Kmol
P is pressure = 239 kPa
T is temperature = 21°C = 294 K
V is volume = 12.8 L
Therefore;
n = PV/RT
n = 239 × 12.8 / 8.314 × 294
n = 1.25 moles
The number of moles of helium gas is 1.25 moles
At peak temperature, T = 46°C = 319 K
Using P1/T1 = P2/T2
P2 = P1T2/T1
P2 = 239 × 319/294
P2 = 259.3 kPa
The pressure at peak temperature is 259.3 kPa
At 42°C, T = 315 K
Using P1/T1 = P2/T2
P2 = P1T2/T1
P2 = 239 × 315/294
P2 = 256.07 kPa
Since the internal pressure is above 256 kPa, the balloon will burst.
The pressure should be reduced to a value less than 256 kPa by reducing the temperature.
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How many grams of Al2O3are present in 7.1 x 10^22 molecules of Al2O3?
Answer:
13.4g
Explanation:
we know that:
1 mole = 6.02 × 10²³ atoms
make the unknown number of moles = x
x = 7.1 × 10²² atoms
putting them both together:
1 mole = 6.02 × 10²³ atoms
x = 7.1 × 10²² atoms
Cross multiply:
6.02 × 10²³ x = 7.1 × 10²²
divide both sides by 6.02 × 10²³
[tex]x = \frac{7.1 \times 10²² }{ 6.02 × 10²³} [/tex]
[tex]x = \frac{71}{602} [/tex]
we now have the number of moles of Al₂CO₃
to calculate the grams (mass):
[tex]moles = \frac{mass}{relative \: formula \: mass} [/tex]
[tex]mass = moles \: \times \: relative \: formula \: mass[/tex]
add up all of the atomic masses of Al₂CO₃ to calculate relative formula mass:
(27 × 2) + 12 + (16 × 3) = 114
the grams (mass) of Al₂CO₃:
[tex] \frac{71}{602} \times 114 = 13.4g[/tex]
please help 500 J of work are done on a box when it is pulled horizontally across a frictionless floor by a force of 50 N. How far did the box slide?
A. 15 m
B. 1 m
C. 10 m
D. 100 m
Answer:
C: 10m
Explanation:
Work Done = Force x Distance
500 = 50 x Distance
To get to 500 multiply 50 by 10!
So, the box slid 10m.
Hope this helps and have a good day! ;D
What mass of silver can be produced from 3.00 g of copper and 3.85 g of silver nitrate?
Answer:
Explanation:
Balanced Chemical Equation:
Cu + 2 AgNO₃ → Cu(NO₃)₂ + 2 Ag
Step 1: Find Limiting Reagent
Moles of Cu:
Mole = 3 g / 63.55 g/mol = 0.04721 mol
Moles of AgNO₃:
Moles = 3.85 g / 169.87 g/mol = 0.022664 mol
Also, Mole ratio of Cu : AgNO₃ is 1 : 2. Hence, 0.04721 mol of Cu will require 0.09442 mol of AgNO₃. This means, AgNO₃ is the limiting reagent.
Step 2: Calculate moles of Ag:
0.022664 mol of AgNO₃ will produce 0.022664 mol of Ag because both have same ratio in balanced chemical equation.
Step 3: Calculate mass of Ag:
Mass = 0.022664 mol × 107.87 g/mol = 2.4447 g
1. What are some things that gray wolves eat?
A. large and small animals
B. trees and plants
C. fruits and insects
D. humans and their pets
Answer:
A, and C are foods that wolves eat.
Explanation: Hope this helps
How many molecules of sodium nitrate are produced when 40 g of sodium azide, NaN3, react with oxygen?
a
3.7x10^23
b
9.2x10^22
c
1.85x10^23
d
6.02x10^23
Will a piece of fruit left in the open air rot sooner in summer or in winter?
I need help please !!!
(01.05 MC)
Two changes are described below.
A. Ice melts to form water.
B. Sugar cubes dissolve in hot coffee.
Which statement is true about the two changes?
Answer:
A is it
Explanation:
Determine the number of moles of air present in 1. 35 L at 750 torr and 17. 0°C. Ideal Gas Law formula: PV = nRT(R = 62. 396 L•torr/mol•K) Which equation should you use? P equals StartFraction n R T over V EndFraction. N equals StartFraction R T over P V EndFraction. N equals StartFraction P V over R T EndFraction.
Answer:
Answer: PV/RT = n = N equals startfraction P V over R T endfraction Explanation:
solve this questions please
Answer:
C. through concentrated sulphuric acid and then over heated copper
how fast is a motor cycle going that travels 6 miles in 4 minutes
Answer: 60 minutes per hour, sixty miles per hour, therefore, one mile per minute.
Explanation: