Calculate the number of atoms

50 J of work was done on a system, as a result of which 29 J of heat energy was removed from it. How would this affect the inter

alexandr402 [8]

Answer:

Work done=50J

Heat removed=29J

Now

$\\ \sf\longmapsto \Delta E=-50+29$

$\\ \sf\longmapsto \Delta E=-21J$

Hence the internal energy would decrease by 21J

Option B is correct

7 0

2 years ago

Read 2 more answers

Isotonic saline solution has a mass % nacl concentration of 0.900 %. assuming its density is 1.00 g/ml, what is its molarity

Nataliya [291]

In this item, we calculate the moles of NaCl with the basis of 1L of solution.
First, calculate the mass of the solution using the density.
m = (1L) x (1000g/1000mL)(1000mL/1L) = 1000g
Then, we calculate mass of NaCl by multiplying the calculate value with the percentage.
m of NaCl = (1000 g)(0.0090) = 9 g
Then, calculate the moles of NaCl by the molar mass.
molarity = (9g)(1 mole/ 58.44 g) = 0.1539 mole / L solution or 0.1529M. Then, the answer to this item is letter C.

7 0

3 years ago

Hydrogenation of poly(butadiene) converts both cis and trans isomers to the same linear structure, and vinyl groups to ethyl bra

Alexeev081 [22]

Answer:

The average number is given as 48.6

Explanation:

From the question we see that the

Percentage of cis = 47.2%

Percentage of trans = 44.9%

Percentage of vinyl = 7.9%

The chemical reaction equation for the hydrogenation of polybutadiene is shown on the first uploaded image

To obtain the average number of backbone carbon between the ethyl side chains ,we divide the total number of carbon on the backbone by the total number of ethyl group

That is

= (44.9% × 4 + 47.2% ×4 + 7.9% × 2) ÷(7.9% × 1)

= (384.2%/7.7%)

= 48.6

Note : The percentage will cancel out

7 0

3 years ago

Consider a sample that is a mixture composed of biphenyl, benzoic acid, and benzyl alcohol. Predict the order of elution of the

Tems11 [23]

Answer:

biphenyl, benzyl alcohol, benzoic acid

Explanation:

Due to the nonpolar nature of cyclohexane, biphenyl will be the first solute to be eluted due to the presence of two phenyl rings. The second solute to be eluted will be benzyl alcohol due to the presence of OH group. This is because it has the ability to exhibit hydrogen bond with the silica column of the chromatography. Lastly, the benzoic acid will be the third solute to be eluted due to the presence of COOH group which is more polar than the OH group. Therefore, the order of elution of the components in the mixture is biphenyl, benzyl alcohol, benzoic acid.

6 0

3 years ago

50 Points!

Feliz [49]

A heat energy equal to 6300 J is required to heat 10.75 g of ice to steam.

<h3>Explanation: </h3>

Given:

Amount of transferred energy = Q =?

Mass of ice (water) = m = 10.75 g

Initial temperature of ice = $T(i) = -22\°C$