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Group Title
Calculate the volume of ).1 M NaOH solution you need to add to 50.0 ml of 0.1 M CH3COOH solution to form a buffer ph 4?
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 updated 2 months ago
 2 replies
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Mathematics

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(cosx )/( sin^20 x)
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 updated 7 months ago
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Mathematics

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Given the sequence length and the number of mutations between two sequences, calculate the percent identity shared among these sequences. S…
 updated 11 months ago
 3 replies
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Mathematics

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Group Title
A solution contains naphthalene (C10H8) dissolved in hexane (C6H14) at a concentrate of 11.03% naphthalene by mass. Calculate the vapor pres…
 updated one year ago
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Mathematics

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N2O4(g)<>2NO2 , kp= 0.15
A gaseous mixture contains 0.600 ATM pressure of n2o4 is mixed with 0.75. ATM pressure of no2. Calculate the equi…
 updated one year ago
 14 replies
 3 Medals
Mathematics

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What is the molality of a naphthaleneinbenzenesolution with the same freezing point as a 0.55 m sucrose in H2O? (For H2O: Kf = 1.86 For B…
 updated one year ago
 1 reply
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Mathematics

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Group Title
Find Ecell: Ag(s)I Ag+( 0,34M) II Cl( 0.093M) I Cl2(0.55atm)I Pt(s) ?
 updated one year ago
 1 reply
 1 Medal
Mathematics

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Group Title
At 25C, Kc=3.86*10^4 for the reaction: 2NOCl(g)> 2NO(g)+Cl2(g)
delta Hf for NOCl=51.71Kj/mol , and deltaHf for NO=90.25 kJ/mol. Calculate…
 updated one year ago
 1 reply
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Mathematics

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What is the pH of an aqueous solution that is 8.7×10−2 NaOCl?
 updated one year ago
 1 reply
 4 Medals
Mathematics

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Group Title
The density of a 0.658 molality solution of glucose in water is 1.173 g/mL, and the molar mass of glucose is 180.2 g/mol. what is the molari…
 updated one year ago
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Mathematics

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In the first order reaction A. products [A]= 0.826M initially and 0.634 M after 15.0 min. What will [A] be after 2.7 h? ( t1/2= 39.3 min)
 updated one year ago
 9 replies
 1 Medal
Mathematics

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Group Title
Starting with 1.20 g A, what is the mass of A remaining undercomposed after 1.00h? ( t1/2= 16 min)
 updated one year ago
 2 replies
 1 Medal
Mathematics

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Group Title
Rate question : Assume the rate remains at 1.82*10^5 Ms^1. How long would it take for [A] to change from 0.3585M to 0.3505M?
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 updated one year ago
 3 replies
 1 Medal
Mathematics

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Average velocity question :A car makes a trip due north for threefourths of the time and due south onefourth of the time. The average nort…
 updated one year ago
 1 reply
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Mathematics

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A car makes a trip due north for threefourths of the time and due south onefourth of the time. The average northward velocity has a magnit…
 updated one year ago
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Mathematics

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In a discount supermarket, it is found that 70% of the sales are for less than 50$. Find the probability a) Four randomly selected sales are…
 updated one year ago
 2 replies
 1 Medal
Mathematics

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Group Title
Rank from most conductive to least conductive: AlCl3, C6H12O6, KBr, C3H7OOH ??
 updated one year ago
 5 replies
 1 Medal
Mathematics

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Group Title
What would be the empirical formula?A certain hydrate is found to have the composition 20.3% , 8.95% , 36.3% , and 34.5% by mass.
 updated one year ago
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Mathematics

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A 0.1888 sample of a hydrocarbon produces 0.6191 and 0.1774 in combustion analysis. Its molecular mass is found to be 134.2 . For this h…
 updated one year ago
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Mathematics

S:
Group Title
Use separation of variables to solve differential equation: dy/dt=t/((y+1)^1/2)), y(1)=3 ???
 updated one year ago
 12 replies
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Mathematics

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use separation of variables to solve differential equation :dy/dx=t/(y+1)^(1/2) , y(1)=3 ?
…
 updated one year ago
 9 replies
 1 Medal
Mathematics

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Group Title
After an advertising campaign, the sales of a product often increase and then decrease. Suppose that t days after the end of the advertisin…
 updated 2 years ago
 7 replies
 1 Medal
Mathematics

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Group Title
An object is thrown up from a height of 160 feet. Its velocity at t is v(t)=32t+24 ft/ sec
How do i find the velocity when it hits the gr…
 updated 2 years ago
 3 replies
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Mathematics

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Group Title
An object is thrown up from a height of 160 feet. Its velocity at t is v(t)=32t+24 ft/ sec a) how high will it go? b) with what velocity wi…
 updated 2 years ago
 4 replies
 1 Medal
Mathematics

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Group Title
how to find x in x^2x1 ?
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 updated 2 years ago
 11 replies
 1 Medal
Mathematics

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Group Title
using the definition of derivative(limits) compute f'(x)
f(x)=3/(4x2) ?
 updated 2 years ago
 6 replies
 1 Medal
Mathematics

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Group Title
Find dy/dx: y=e^(53lnx)
 updated 2 years ago
 19 replies
 2 Medals
Mathematics

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Group Title
find dy/ dx and simplify : y=lnx/e^(2x) ?
 updated 2 years ago
 7 replies
 1 Medal
Mathematics

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Group Title
Simplify : e^(2lnx)+3e^ln(2x)
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 updated 2 years ago
 15 replies
 2 Medals
Mathematics

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Group Title
Simplify e^(ln2x+2ln3x)+e^(ln3)
 updated 2 years ago
 2 replies
 1 Medal
Mathematics
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