# Posts by Den

Total # Posts: 35

Chemistry
I see, thank you so much for the help! I didn't expect anyone to answer and less reply continuously haha. I'm very grateful! Thank you once again and have a great day!

Chemistry
So all 2 moles of O2 are used for the molar fraction formula even though only one of its moles can react to the 4 moles of HCl because '-x' is being added to it?

Chemistry
I went back to look at my procedure and I noticed I made an error in the second one, I actually got (1-x / 5-x) , which is one of the choices. Could that be the answer? Or do we have to take into account all moles of O2 despite the proportion given in the equation, thus the ...

Chemistry
They want O2 after equilibrium is reached. The problem doesn't give me the equilibrium constant. And I suppose x would be the unknown value you put when you're writing the ICE table? for example there are 2 moles of O2 at the beginning, x would be the change, and the ...

Chemistry
"For 4HCl + O2 <-> 2Cl2 + 2H2O : If in a container of 1.0 L we start with 2 moles of O2 and 4 moles of HCl, the molar fraction of O2 is: a) x/5 - x/2 b) 1-x / 6+x c) 5x / 5-x d) 1-x / 5-x e) 2x / 6-x " I tried solving this, but I wasn't sure if all 2 moles ...

Chemistry
If a strong acid or base is dissolved in water, will all of its parts have the concentration? For example in Ca(OH)2 = Ca + 2OH if the concentration of Ca(OH)2 is 8.11x10^-3 M, would the concentrations of Ca and 2OH be the same? or in the case of OH, the concentration has to ...

Statistics
10 A color candy was chosen randomly out of a bag. Below are the results: Color Probability Blue 0.30 Red 0.10 Green 0.15 Yellow 0.20 Orange ??? a. What is the probability of choosing a yellow candy? b. What is the probability that the candy is blue, red, or green? c. What is ...

Math
At Smith's club the pay-per-visit fee is \$5 per day. would Smith save money paying per visit? Assume that a month has 4.3 weeks. what percentage of his monthly \$90 fee would he spend if he paid on a per-visit basis? 2. IF Smith goes to the gym three times per week, what ...

geologic time

Chem
Balance the chemical equation for the important industrial process: C2H4 + O2 + HCl → C2H4Cl2 + H2O. Given 610.0 kg of hydrochloric acid, calculate how many kg of C2H4Cl2 can be produced.

n the titration of 25.00 ml of a water sample, it took 20.590 ml of 4.995x10-3 M EDTA solution to reach the endpoint. Complete the questions below: Calculate the number of moles of EDTA required to titrate the water sample. (enter your answer with 3 significant figures) 0....

chem help w/ Lab
Weight of the mustard package Sample: 3.02 (g) Weight of the mustard package Solution: 33.3 (g) Trial #1 Trial #2 Trial #3 Weight of Mustard Package Solution Delivered (g) : 1.09 .948 .909 Weight of NaOH Solution Delivered (g) : .354 .304 .269 Concentration of NaOH : 7.48e-3 (...

CHEM LAB Help
After getting this, in order to convert the three masses into moles, what do I divide each mass by

CHEM LAB Help
mustard solution, how would i calculate the mass of naOH used?

CHEM LAB Help
Forget it i got the answer

CHEM LAB Help
Weight of the mustard package Sample: 3.02 (g) Weight of the mustard package Solution: 33.3 (g) Trial #1 Trial #2 Trial #3 Weight of Mustard Package Solution Delivered (g) : 1.09 .948 .909 Weight of NaOH Solution Delivered (g) : .354 .304 .269 Concentration of NaOH : 7.48e-3...

Chem
Arrange the following atoms in order of increasing size from smallest to largest. Phosphorus Fluorine Chlorine Sulfur

Psychological Statistics
Simply reporting measures of central tendency or measures of variability will not tell the whole story. Using the following information, what else does a psychologist need to know or think about when interpreting this information? A school psychologist decided to separate some...

Int algebra
Convert the system of equations into a matrix equation. x+4y-z=7 x+y+z=2 -2x-2y+2z=-8

physics
60 mph, i think. i first found the radius (since it's the same for both) then calculated the speed for curve b

algebra
A basket contains 11 pieces of fruit: 4 apples, 5 oranges, and 2 bananas. Jonas takes a piece of fruit at random from the basket, and then Beth takes a piece at random. What is the probability that Jonas will get an orange and Beth will get an apple?

9gr
-72 ?????

9gr
3 - 15 × 5 a. 90 b. 0 c. –72 d. 78

science
Which shows the expression below simplified? (3.6 × 10^15) + (1.8 × 10^12) a. 3.60018 × 10^15 b. 3.902 × 10^14 c. 3.618 × 10^15 d. 3.6018 × 10^15

science
Sorry! Which shows the expression below simplified? (3.6 × 1015) + (1.8 × 1012) a. 3.60018 × 10^15 b. 3.902 × 10^14 c. 3.618 × 10^15 d. 3.6018 × 10^15

science
Which shows the expression below simplified? (3.6 × 1015) + (1.8 × 1012) a. 3.60018 × 1015 b. 3.902 × 1014 c. 3.618 × 1015 d. 3.6018 × 1015

9gr
Evaluate each expression. 7 + (3 + 12 / 2)^2 a. 16 b. 88 c. 46 d. 256 I think 88 ????????

9gr
I don't understand.????

9th
15 ITS RIGHT?

9th
Evaluate each expression. 9 ¸ 3 + 3 ´ 4 a. 24 b. 15 c. 17 d. 6 MY ANSWER 15??????

9th
I DON'T KNOW. b.???

9th
Define a variable and write an expression for the phrase. the quotient of 6 times a number and 16 a.(16x) / 6 b.(6x) / 16 c.96x d.x / 96