4.
M=Mol/vol
M= 0.2mol/2.0L
M=0.1mol/L
***
The teacher said we should only balance with whole nubbers so would it be
2H2 + O2 = 2H2O....?
moles of H
0.22 mol
sooo... moles of O is also 0.11mol?
c)calculate the number of moles of water produced when 4.00 g of oxygen are used
2H2 + O2 = 2H2O...
Hi, I have some reviw questions for the upcomming chemistry exam, the problem is I don't have the answers so can some one read throught my work and check if it is wright? Thanks.
***
1. An anaysis of a valitile liquid shoed that it wsa composed of 14.4%C, 2.37% H and 83.49% Cl. If 4.25 g of...
Pleas help! exam tommarow!!!! Trigonometry word problems
Hi, i really need help with this question,
on a wall, a spider is 100cm above a fly. the fly starts moving horizontally at the speed of 10cm/s. After 1s, the spider begins moving at twice the speed of the fly, in such a way as to...
Its supposed to be sequences and series
so what I was doing was finding the % of medicnin that was in his body, but I guess this approach was wrong
So I have to find the amount of medicin that is in his body
So...
t0=5oomg
t1=625mg
t2=656.25
Then
tn-1 x 0.25+500
would be the recursave fomula
Tod injured his wrist while he was skateboarding. To relive the pain his doctor prescribed him some medication. He takes 500mg of medicine every 6h. Only 25 % of the medication remains in his body by the time he is ready to take another pill.
Write and equation to model this.
so 25% is...
1.
are you sure? the answer in the back of the book sayes it is 34 and i cheked it again.
_____________________________________________________________
2. ok, thanks
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4. the sum of 50 consecutive even intergers is 3250. tha...
Please help I have ALOT of questions!!
1.)Starting at 888 and counting backward by 7, a student counts 888, 881 and 874, and so on. Which of the following numbers will be included?
a) 35 b) 34 c) 33 d) 32 e) 31
Ok, so I by using the calcuator the aswer is 34, but how would you calcuate...
OK, these questions are supposed to be really easy, but I keep geting the wrong answer and I don't understand why, could someone pleas look at my work and tell me what I am doing wrong?
Find the indicated sum of each arithmetic series
S15 for 4 + 11 + 18 + ...
Sn= n/2 [ 2a + ( n - 1 ) d...
The cost of extracting and purifying metals is varied for various reasons, this means that the company might not make profit on the iron ore.
Since there is a ,relatively, large amount of iron ore it is cheap. This means that the company needs to find a lot of it in order to make a profit.
If...
I really don't know what catagoir this would go under :confused: , but its an assignment for chem so...
Woud there be any positive envromental impacts of iron ore extraction? This was on of the topics we had to reaserch, but form 3 days of searching throught the net, positive effects iron ore...
A student obtains 25.00 mL of an HCl solution of unknown concentration. Upon titration, 21.35 mL of 0.1200 M NaOH are required for neutralization. Determine the concentration of the HCl solution.
the capital M is molar mass right? but i thught that was constant so how can it be 0.1200 M NaOH...
1.what is the equation of the largest circle that can be incribed in a square of side length 9 units, if the diagonals of the square intersect at (-1,3).
where the radious is 9, but the ansewer in wrong
***
2.Todd is flying his radio-controilled airplane abouve the ground in a circular path...
^ thanks
I thought the two numbers were 25 and ...but how do you rght that? 2root25
simplify es to 2root5, but thats wrong right?
the answer in the book was x^2+y^2=49
Hi, I need help with these questions
Given the endpoints of a diameter, write an equation for the circle.
a) (-3,5) and (1,3)
I tryed this
m= (x1+x2)/2, (y1+y2)/2
= (-3+1)/2 , (5+3)/2
= -2/2, 8/2
= (-1,4)
( x-h)^2 + (y-k)^2=r^2
(x+1)^2 + (y-4)^2=r^2
(1+1)^2 +...
and I have another question
If 3.45 x 10^23 formula units of Hg(NO3)2 are reacted with excess of Na2S, what mass of HgS can be expected if this process occurs with 97% yield?
What are fomula units?
you would do that question the same way as the previous one right?
^ Thanks
#mols of C6H6
n=m/M
n=12.8g/78.06g/mol
n=0.164mol
#mols of C6H5NO2
=0.164mol(0.70)
=0.1148mol
mass of C6H5NO2
m=nM
m=0.1148mol(123.06g/mol)
m=14.1g
Like this?
the folowing reaction proceeds with a 70% yeild
C6H6 + HNO3 = C6H5NO2 + H2O
calculate the mass of C6H5NO2 expected if 12.8g of C6H5 reacts with excess HNO3
How do you do this problem?