What is 950% as a fraction

9 1/2

Step-by-step explanation:

F'=708.53 N

Explanation:

We have,

The lifting force, F, exerted on an airplane wing varies jointly as the area, A, of the wing's surface and the square of the plane's velocity, v. It means tat,

k is constant

If, A = 190 Ft², v = 220 mph, F = 950 pounds

Let's find k first from above data. So,

It is required to find the lifting force on the wing if the plane slows down to 190 miles per hour. Let F' is the new force. So,

So, the lifting force is 708.53 pounds if the plane slows down to 190 miles per hour.

Answer:

A) Considering the solution of molality, molarity and density, the molality of the glycerol solution is 0.029 .

Molality is a measure of concentration that indicates the ratio of the number of moles of any dissolved solute to kilograms of solvent.

The Molality of a solution is determined by the expression:

Molality is expressed in units .

B) In this case, you know a 2.950×10⁻² M solution of glycerol (C₃H₈O₃) in water is at 20.0∘C. The sample was created by dissolving a sample of C₃H₈O₃ in water and then bringing the volume up to 1 L.

So, being the molarity the number of moles of solute that are dissolved in a certain volume and determined by the following expression:

the number of moles of solute can be calculated as:

number of moles of solute= molarity× volume

Then, in this case, the number of moles of solute is calculated as:

number of moles of solute= 2.950×10⁻² M× 1 L

Solving:

number of moles of solute= 2.950×10⁻² moles

On the other side, density is a quantity that allows us to measure the amount of mass in a certain volume of a substance. Then, the expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:

C) Then, the mass can be calculated as:

mass= density×volume

In this case, you know that the volume of water needed was 998.7 mL  and the density of water at 20.0∘C is 0.9982 g/mL. So the mass of water can be calculated as:

mass of water= mass of solvent= 0.9982 g/mL× 998.7 mL= 996.9 g= 0.9969 kg

D) Finally, the molality is calculated as:

Solving:

Molality= 0.029

In summary, the molality of the glycerol solution is 0.029 .

F'=708.53 N

Explanation:

We have,

The lifting force, F, exerted on an airplane wing varies jointly as the area, A, of the wing's surface and the square of the plane's velocity, v. It means tat,

k is constant

If, A = 190 Ft², v = 220 mph, F = 950 pounds

Let's find k first from above data. So,

It is required to find the lifting force on the wing if the plane slows down to 190 miles per hour. Let F' is the new force. So,

So, the lifting force is 708.53 pounds if the plane slows down to 190 miles per hour.

a. 2.959x10⁻²m

b. 5.327x10⁻⁴

c. 0.272%

d. 2718 PPM

Explanation:

A solution of 2.950x10⁻²M contains 2.950x10⁻² moles of Glycerol per Liter of solution. As the volume of the solution made was 1.000L, moles of glycerol are 2.950x10⁻².

a. molality: Molality is defined as the ratio between moles of solute (2.950x10⁻²) in kg of solvent. As there are 998.7mL of solvent and density is 0.9982g/mL, kg are:

998.7mL ₓ (0.9982g/mL) ₓ (1kg / 1000g) = 0.9969kg of solvent.

Molality: 2.950x10⁻² moles / 0.9969kg of solvent = 2.959x10⁻²m

b. Mole fraction is the ratio between moles of solute and total moles. Moles of water are:

998.7mL ₓ (0.9982g/mL) ₓ (1mol / 18.01g) = 55.35 moles of water.

Mole fraction glycerol:

2.950x10⁻² moles / (2.950x10⁻²moles + 55.35) = 5.327x10⁻⁴

c. Percent by mass Is the ratio by mass of solute and solution multiplied 100 times.

Mass of glycerol (Molar mass:  92.09g/mol):

2.950x10⁻² moles × (92.09g / mol) = 2.717g of glycerol

Mass of water:

998.7mL ₓ (0.9982g/mL) = 996.9g of water.

Percent by mass:

2.717g of glycerol / (996.9g of water + 2.717g) × 100 = 0.272%

d. Parts per million are defined as the ratio between mg of solute and kg of solution.

mg of 2.717g of glycerol are 2717mg

kg of solution are (996.9g + 2.717g) / 1000 = 0.9996kg

Parts per million:

2717mg / 0.9996kg = 2718 PPM

b) True , this is right. But this is not for 1000 alone for any sample size of large number randomly drawn we can expect 95%

Step-by-step explanation:

Given that in 2013, the Pew Research Foundation reported that "45% of U.S. adults report that they live with one or more chronic conditions", and the standard error for this estimate is 1.2%

Let us check one by one answers given

a) False.  Because we can say 95% or 90% confident only that the true percent of US adults cannot be true.

b) True , this is right. But this is not for 1000 alone for any sample size of large number randomly drawn we can expect 95%

c) False this does not give whether less than 50% or not unless we know the confidence interval range.

d) False, std error is a measure of variation of all the items from the mean.

- Mole fraction of SO₃ : 0.135

- Partial pressure SO₃ = 0.128 atm

Explanation:

Let's find out the mole fraction to know, what we were asked.

Mole fraction = Moles of a gas / Total moles

Mole fraction can also corresponds to Pressures, like this:

Mole fraction = = Partial pressure of a gas  / Total pressure

And this values are the same

The total moles of gases are:

Moles of SO + Moles of O₂ + Moles of SO₃ =

26 + 83 + 17 = 126 moles

Mole Fraction SO₃ = Moles of SO₃ / Total moles

17 / 126 = 0.135

This can be used to find out the partial pressure

Mole fraction = Partial pressure SO₃ / Total pressure

0.135 = Partial pressure  SO₃ / 0.950 atm

0.135 atm . 0.950atm = Partial pressure  SO₃

Partial pressure SO₃ = 0.128 atm