Answer:
17.4 grams butane, C4H10
Step-by-step explanation:
I'll assume the water, H2O, is produced from the butane, C4H10, by a combustion process using oxygen, O2. We need a balanced equation to start the calculation.
The basic combustion reaction is:
C4H10 + O2 = CO2 + H2O
The basic equation needs to be balanced. The same numbers and types of atoms must be equal on both sides. We can see that one atom of C4H10 contains 4 carbons and 10 hydrogens.
Carbon: The carbons wind up in the CO2 molecule. But each CO2 only has 1 carbon, so we need at least 4 CO2 molecules:
C4H10 + O2 = 4CO2 + H2O
Hydrogen: Hydrogen atoms are used to form the water. 10 hydrogens from 1 C4H10 will be used to produce 5 H2O molecules, since each requires 2 hydrogens.
The leads to:
C4H10 + O2 = 4CO2 + 5H2O
Now all the carbons and hydrogens are accounted for. But the oxygens are still not balanced. As written, we have 1 molecule of O2, for 2 oxygen atoms. But from the last step in our balancing work, we need 8 from the 4CO2) and 5 for the H2O, for a total of 13 oxygen atoms. Normally, this would be easy to add more oxygen molecules, but since they comes in pairs (O2), we can only add two at a time, so there will never be an odd number of O atoms from the reactant side.
To solve this, try adding a coefficient of 2 to the C4H10 and rebalancing the H2O and CO2:
2C4H10 + O2 = 4CO2 + 5H2O
We need to adjust both the CO2 and H2O to accommodate the added C and H atoms (a total of 8C's and 20 H's):
2C4H10 + O2 = 8CO2 + 10H2O
Now we see we need more O2, since there is a total of 16 plus 10, or 26 O atoms in the 8CO2 and 10H2O molecules. To provide 26 O atoms, we need a coefficient of 13 in front of the O2 on the reactant side:
2C4H10 + 13O2 = 8CO2 + 10H2O
Now the equation is balanced. It tells us we'll need 2 moles of C4H10 to produce 10 moles of H2O. That's a molar ratio of 5 moles water/1 mole butane. Or, (0.2 moles butane)/(mole water).
Now convert 27 grams water into moles water:
The molar mass of water is 18 grams/mole. 27 grams of H2O is therefore:
(27 grams)(18 grams/mole) = 1.5 moles H2O
We discovered earlier that we need (1/5) that number of moles of butane. Therefore, we need:
(1.5 moles H2O)*((0.2 moles butane)/(mole water)) = 0.3 moles butane to produce 1.5 moles (or 27 grams) of water.
Now convert 0.3 moles butane into grams butane by multiplying by butane's molar mass of 58.0 g/mole:
(0.3 moles)(58.0 g/mole) = 17.4 grams butane to produce 27 grams of water.
=====
Wheh! That's a lot of work for 27 grams of water. But the heat released will be fun.
An artist wants to create a painting on a semicircle canvas with a radius of 13 feet. He wants to surround the canvas with a piece of string. The string costs $1.05 per foot. How much will the piece of string that he needs cost? Round your answer to the nearest dollar.
A. $43
B. $82
C. $14
D. $41
2. which of these units would be used to measure each of the following:
mm2, cm2, m2, km2.
Answer:
A. m2
b.km2
c.cm2
d.km2
e.m2
Step-by-step explanation:
mr cleans account was deleted ;-;
Answer number 10 and number 3 and 4
Answer:
where's the 10 and 3,4 ? uh there's no number
please help me ASAP.
Answer:
A .1. P
2. NP
3. P
4. NP
5. P
I hope u will like it
Answer:
A.
PNPPNPPB. I don't Know
Step-by-step explanation:
Find the perimeter of the parallelogram with these vertices.
(6,4),(-1, 4), (1, -5), (-6, -5)
Answer:
34.6
Step-by-step explanation:
The perimeter of a plane geometric figure is the sum of its side lengths. This figure has two horizontal sides, so their length is easy to compute. It also has two diagonal sides, so the distance formula or Pythagorean theorem must be invoked to find their length.
The length of diagonal AC is ...
d = √((x2 -x1)² +(y2 -y1)²)
d = √((1 -6)² +(-5 -4)²) = √((-5)² +(-9)²) = √106 ≈ 10.3
The length of each horizontal segment can be found by counting grid squares or by finding the difference of x-coordinates.
AB = 6 -(-1) = 6 +1 = 7
__
Two sides have length 10.3 and two sides have length 7, so the perimeter is ...
P = 2(10.3 +7) = 34.6 . . . units
Plsss if you can find x
Answer:
x=15
Step-by-step explanation:
Find the missing angles
Answer:
z=116 (opposite angles are equal)
y=180-(116+27)=37(angles in a triangle sum up to 180)
x:
(z) + (27+x) =180(interior angles on same side are supplementary
116 + 27+ x =180
x= 37
For which values of c does the quadratic equation x^(2)-2x+c=0 have No real roots?
Answer:
c > 1
Step-by-step explanation:
Given equation: [tex]x^2-2x+c=0[/tex]
General form of quadratic equation: [tex]ax^2+bx+c=0[/tex]
We can use the discriminant to determine the value of c for which the equation has no real roots.
[tex]b^2-4ac < 0\implies \textsf{no real roots}[/tex]
From the given equation:
[tex]a=1[/tex][tex]b=-2[/tex][tex]c=c[/tex]Inputting these values into the discriminant formula:
[tex]\implies (-2)^2-4(1)(c) < 0[/tex]
[tex]\implies 4-4c < 0[/tex]
[tex]\implies 4 < 4c[/tex]
[tex]\implies 1 < c[/tex]
[tex]\implies c > 1[/tex]
Here
a=1b=-2Discriminant must be less than 0
[tex]\\ \rm\Rrightarrow b^2-4ac<0[/tex]
[tex]\\ \rm\Rrightarrow (-2)^2-4(1)(c<0[/tex]
[tex]\\ \rm\Rrightarrow 4-4c<0[/tex]
[tex]\\ \rm\Rrightarrow 4(1-c)<0[/tex]
[tex]\\ \rm\Rrightarrow 1-c<0[/tex]
[tex]\\ \rm\Rrightarrow 1<c[/tex]
[tex]\\ \rm\Rrightarrow c>1[/tex]
A woodworker wants to cut a board that is 436.2 inches long into 6 equal pieces. How long will each of the cut boards be?
answer with work.
will give brainliest
Answer:
72.7 inches
Step-by-step explanation:
436.2 / 6 = 72.7
Find the value of each variable in the parallelogram. Please help!
Answer:
m = 35 , n = 110
Step-by-step explanation:
the opposite angles of a parallelogram are congruent , then
2m = 70 ( divide both sides by 2 )
m = 35
consecutive angles are supplementary, that is sum to 180° , then
n + 70 = 180 ( subtract 70 from both sides )
n = 110
Solution:
We know that:
In a parallelogram, opposite angles are equivalentThis means that:
70 = 2mDivide 2 both sides to find m:
70 = 2m70/2 = 2m/2m = 70/2 = 35°We can see that two angles measuring 70° and n° are a linear pair.
n + 70 = 180n = 180 - 70 = 110°A survey in September 2020 of 1000 gas stations found that the price charged for a gallon of regular gas could be closely approximated by a normal distribution with a mean of $3.53 and a standard deviation of $0.20.
Draw the normal distribution with these numbers.
a. How many stations charge over $3.93?
b. How many of the stations charge between $3.13 and $3.93 for a gallon?
c. How many stations charge less than $3.33?
Please answer correctly
Answer:
2nd and 4th options
Step-by-step explanation:
both answers begin with a fixed point drawn with a straight line through a point that continues on by showing an arrow
Answer:
All except FD
Step-by-step explanation:
All except FD
Elena works at an appliance store. She recorded her recent sales.
ovens 5
washing machines 6
dishwashers 4
Of the next 12 appliances Elena sells, how many should she expect to be ovens, given the past data?
Using proportions, it is found that she should expect 4 of the next 12 appliances to be ovens.
What is a proportion?A proportion is a fraction of a total amount, and the measures are related using a rule of three.
In this problem, we have that out of 15 items, 5 are ovens. How many will be out of 12? To find out, we start with the rule of three.
15 items - 5 ovens
12 items - x ovens
Applying cross multiplication:
15x = 60
x = 4.
Hence, 4 of the next 12 appliances to be ovens.
More can be learned about proportions at https://brainly.com/question/24372153
I'm gonna cry someone please help.
Answer:
Median for a: 50 because it is in the middle of the points
Median for b: 35 because it is in the middle of the points.
Step-by-step explanation:
What i do is i write all the numbers out as shown in graph and cross one out on both sides untill there is one left.
IQR A: 15
IQR B: 15
Find the 25 percentile the. the 75 pecentile then subtract the numbers off from eachother.
Have an amazing day!
PLEASE RATE!
If the a > 0 (positive) the graph opens
down or up
Answer:
Step-by-step explanation:
If a > 0 , then the parabola opens upward.
If a < 0, then the parabola opens downward.
A newspaper advertisement offers a $6500 used car for nothing down and 36 easy monthly payments of
$196.80. What is the total amount paid for the car, and what is the total finance charge? Calculate the
simple interest rate charged.
Total Amount:
Total Finance Charge
$
Simple Interest Rate:
%
Using simple interest, it is found that:
The total amount paid was of $7,084.8.The finance charge was of $584.8.The simple interest rate was of 3%.Simple InterestSimple interest is used when there is a single compounding per time period.
The amount of interest after t years in is modeled by:
[tex]I = Prt[/tex]
In which:
P is the initial amount.r is the interest rate, as a decimal.In this problem, the amount paid was of 36 monthly payments of
$196.80, hence:
36 x 196.80 = $7084.8.
The total amount paid was of $7,084.8.
The original price is of $6,500, hence the finance charge was of:
7084.8 - 6500 = $584.8.
For interest, we have that:
[tex]I = 584.8, P = 6500, t = 3[/tex], hence:
[tex]I = Prt[/tex]
[tex]584.8 = 6500(3)r[/tex]
[tex]r = \frac{584.8}{6500 \times 3}[/tex]
[tex]r = 0.03[/tex]
The simple interest rate was of 3%.
More can be learned about simple interest at https://brainly.com/question/25296782
write the ratios for sin A and cos A
What is the simplified form of (3s^2-2s+1)/(s^2-s+2)?
a. 3s+1
b. 3s+7
c. 3+s-5/s^2-s-2
d. 3+ s+7/s^2-s-2
Answer:
[tex]C\: or\: 3+\frac{s-5}{s^2-s+2}[/tex]
Step-by-step explanation:
[tex]\frac{\left(3s^2-2s+1\right)}{\left(s^2-s+2\right)}[/tex]
[tex]\frac{\left(3s^2-2s+1\right)}{\left(s^2-s+2\right)}:[/tex] [tex]\frac{\left(3s^2-2s+1\right)}{\left(s^2-s+2\right)}=3+1\frac{s-5}{s^{2}-s+2 }[/tex]
[tex]=3+\frac{s-5}{s^2-s+2}[/tex]
The measure of an angle is 143.4°. What is the measure of its supplementary angle?
Answer:
Step-by-step explanation:
What is the equation of the line that goes through
the points (4,6) and (2,12)?
A.y=3x+18
B.y=-3x+18
C.y=-3x+6
D.y=3x
Answer:
B) y=-3x+18
Bobby bought a ticket to see a local play that
was on sale for 40 percent off of the original price.
If the original price of the ticket was $39, what
was the sales price of the ticket?
O $15.60
O $25.00
O $54.60
O $23.40
Answer:
23.40
Step-by-step explanation:
Find 60% of 39, it's 23.4
help its all in the screenshot v3
Answer:
it’s the first answer
What is the percentage of Chilean living in rural areas? Go to Population. More than 15% less than 15%. 5% 50%
Answer:
B. less than 15% just took the quiz and got a 100
Step-by-step explanation:
Answer:
b
Step-by-step explanation:
Triangle ABC has angle measures as shown below. Using the information in the
diagram, find the value of x. Be sure to write your answer down on a piece of paper -
you will need it for Question 4.
In your answer, give the value of x and explain how you calculated it.
3(x + 2)°
35
52°
0
Answer:
x=29 i know because i put that and it was a 100
a recipe requires 1/2 cup of flour for every batch of cookies. How many batches of cookies can be made with 4 1/2 cups of flour?
Answer:
You want to know how many cookies can be made using 5 1/2 cups of flour.
1 x 2 2
-------------- = -----
2 x 11 22
2/22 simplified is 1/11
So, You can make 11 cookies with 5 1/2 cups of flour.
Step-by-step explanation:
hope this will help you
please put me in brainlest
Jennifer needs to fit 28 t-shirts into her
new dresser. Each drawer can hold 6
shirts. How many drawers will she need
to use to put all of the t-shirts away?
[?] drawers
Hint: if your quotient has a remainder,
you will need to add one more drawer
so that all of the shirts can be put away.
Enter
Answer:
SO 28 new t shirts.
Each drawer can hole 6 tshirts.
How many drawers needed.
Now this is a division problem, how many “6 tshirts” can fit into 28 t shirts.
Something like that.
Anyways its 28/6 or 28 ÷ 6 = 4 remainder 4
4 r 4
Now we need all t shirts put away not 24 and have 4 left over. So we can just get another drawer and add it to the whole number.
So 5 drawers
PLS HELP!
solve by completing the square
x²+4x=8
Step-by-step explanation:
x²+4x=8
rearrange
x² + 4x - 8 = 0
half of 4 is 2
so
x² + 4x + 2² - 2² - 8 = 0
do x² + 4x + 2²
multiplies to give 4 adds to give 4
2+ 2
(x + 2)²
(x + 2)² - 2² - 8
(x + 2)² - 4 - 8
(x + 2)² - 12
(x + 2 + √12) (x + 2 - √12)
√12 = √4 * √3 = 2 √3
(x + 2 + 2√3) (x + 2 - 2√3)
The radius of a circle is 1 mlle, What is the circle's area?
Answer:
area = 3.14 mi² (to the nearest hundredth)
Step-by-step explanation:
Area of a circle = [tex]\pi r^2[/tex]
(where r is the radius)
Given:
radius = 1 mileSubstitute r = 1 into the equation:
⇒ area = [tex]\pi[/tex] × 1²
⇒ area = [tex]\pi[/tex] mi²
⇒ area = 3.14 mi² (to the nearest hundredth)
Answer:
π
Step-by-step explanation:
→ State the formula for the area of a circle
π × r²
→ Substitute in the numbers
π × 1² = π
What's the answer
[tex]4x {5}^{?} [/tex]
Answer:
Step-by-step explanation:
What's the question ?
How to find the area and circumference
Answer:
area 7²pi in²
circumference 14pi
Step-by-step explanation:
area of circle = r²pi
circumference of circle = d pi