Jane

Alright so I have this chemistry question and there's three parts, I know how to do the second two but i can't fiqure out the first which is what I need to do the others. So I'm just posting the first question on here, but I would love it if you could explain your steps so I could follow along, thank you!

The equilibrium between three substances, A, B, and C is shown below

A (g) + B (g) = 2C (g)

Initially there were 0.1mol of A and 0.2 mol of B in the reaction mixture. A and B reacted together to produce an equilibrium mixture containing 0.04 mol of C. The total volume of the mixture was 2.00 dm^3.

Calculate the number of moles of A and B at equilibrium.

In this experiment a fair cubical dice was rolled repeatedly until a 6 resulted, and the number of rolls was recorded. The experiment was conducted 60 times.

1. Show that you would expect to get a 6 on the first roll at least ten times during the 60 times the experiment was conducted.

(I'm assuming this is because there are 6 numbers on the die and so 1/6th of the time you should get the six on the first roll, which, out of 60, would be ten times, but I don't really know what it means by "show" that you expect it, maybe a tree diagram? maybe i'm completely wrong, i dont know)

2. Find the expected frequency for two rolls, correct to one decimal place.

If you could show your work so i could follow along that would be great, thank you!

An electronic device produces an output of 0, 1, or 3 volts each time it is operated with probabilities of 1/2 , 1/3, and 1/6 respectively. The random variable x denotes the result of adding the outputs of two such devices which act independently.

1. Tabulate the possible values of x with their corresponding probabilities

2. . On 360 independent operations on the device, states on how many occasions you would expect the output to be 1 volt.

If you could show your work that would be great so that I could follow along and see what you did and how you solved this, thank you!

Three cards are selected at random, without replacement, from a pack of 52 cards. Using a tree diagram, find the probability distribution of the number of honours (A, K, Q, J, 10) obtained.

If you could show your work so that I could follow along that would be great! I think the key is that they aren't replaced, thank you!

The relative molecule mass of a volatile liquid can be found by vaporizing the liquid in a gas syringe. 0.075 g of a hydrocarbon vapor occupies 25.0 cm^3 at 77.0 degrees C. Atmospheric pressure is 101.3 kpa. find the volume of the hydrocarbon vapour in m^3.

Now i know how to start it since i've done some problems like this so i converted the temp to Kelvin and got 350, and i converted the kpa to pa and got 101,300. Im trying to use the formula

V = nRT/P so next i would try to convert grams to moles, but i dont know which hydrocarbon it is.. so i'm kinda stuck..

any work or explanations you can provide would be super helpful! thank you!

The relative molecule mass of a volatile liquid can be found by vaporizing the liquid in a gas syringe. 0.075 g of a hydrocarbon vapor occupies 25.0 cm^3 at 77.0 degrees C. Atmospheric pressure is 101.3 kpa.

Now i know how to start it since i've done some problems like this so i converted the temp to Kelvin and got 350, and i converted the kpa to pa and got 101,300. Im trying to use the formula

V = nRT/P so next i would try to convert grams to moles, but i dont know which hydrocarbon it is.. so i'm kinda stuck..

any work or explanations you can provide would be super helpful! thank you!

find the 5 remaining trig functions of theta.

sin of theta = -1/5 and cos of theta > 0

i know you have to find the quadrant it's in (IV i believe) but i don't know what to do from there. You don't have to find all five, if you could just show me how to get one i could figure out the rest of them, tanks!

when chosen as the best answer, and you look at the rating/comments the person made, does it annoy you if they don't give you 5 stars but all their comment says is thank you? Like there's no "oh, thanks, i was really looking for blah blah blah but this still helped" type thing, it's just "thank you!" like you did nothing wrong but they still didn't give you all 5 stars, it's a trend i'm noticing on here and i was just wondering if it kinda bugged anyone else.

i just want to make sure i'm doing this right before i go through and answer them all this way, it seemed like a bit of an odd answer to get and there's no answer key so i'd just like to make sure that i'm getting the right thing, thanks!

question: find the area of each sector.

problem: theta = pi/6 and radius = 14 inches

what i got: 49pi/3 inches

i have a couple of these, but i really don't want to post them all, so i'm mostly interested in an answer that could walk me through it (showing the work) so that i could follow along and do the rest alone, thank you!!

what is the length of the intercepted arc with the given central angle measure in a circle of the given radius? round to the nearest tenth.

30 degrees is the angle measure and the radius is 8 yards

a wall clock has a face diameter of 8 1/2 inches. The length of the hour hand is 2.4 inches the length of the minute hand is 3.2 inches, and the length of the second hand is 3.4 inches.

determine the angular speed in radians per hour and the linear speed in inches per hour for each hand.

i have NO idea how to even go about starting this.. if you could show the steps that would be super helpful! thanks!

Find the rotation of revolutions per minute given the angular speed and the radius given the linear speed and the rate of rolation.

w(i think it's some greek letter) = 135pi rad/h

pretty sure the answer is1.125 rev/min, but idk how to get it so if you could help me out that'd be great, thanks!

A barrel contains only apples and oranges. There are twice as many apples as oranges. The apples are either red or yellow, and 4 times as many apples are red as are yellow. If one piece of fruit is to be drawn at random from the barrel, what is the probability that the piece drawn will be a yellow apple? Give answer to the nearest tenth.__________% Remember to use just 4 spaces in the answer.

i don't even know what it's looking for. i put in 2 for the number of yellow apples, which would give you 8 red apples, 2 yellow apples, and 5 oranges. therefore i figured okay so the answer would be 13.3%, but then i realized it says to round to the nearest tenth... so does it want me to say 10%? because then it says four spaces... ugh. basically i'm just lost, any suggestions?