Consider a 1.0 L buffer containing 0.083 mol L-1 HCOOH and 0.095 mol L-1 HCOO-. What is the pH of the solution after adding 6.0 x 10-3 mol of NaOH? Express your answer to 2 decimal places.
i'm repeatedly getting 3.87 as my answer....would really appreciate some help!
In: Chemistry
Valero paid a dividend of $1.28 this morning. as per the management discussion and the financial position of the company, dividend next year is expected to be higher by 2%. after that you expect the dividend to grow at a flat of 1.0% forever. if the required rate of return is 7.8%, what should be the post-dividend stock price?
A. 19.20
B. 18.82
C. 22.07
D. 19.40
In: Finance
A buffer consists of 0.91-M propanoic acid ( Ka= 1.4 × 10-5) and 0.76-M sodium propanoate.
a) Calculate the pH of this buffer.
b)Calculate the pH after the addition of 1.2 mL of 0.10–M HCl to 0.010 L of the buffer.
c) Calculate the pH after the addition of 1.8 mL of 1.0–M HCl to 0.010 L of the buffer.
In: Chemistry
A water has a temperature of 10o C and pH = 8. What should be the C.t value for 3-log Giardia removal using (a) chlorine, (b) chloramine. Assume a chlorine residual of 1.0 mg/L is required. If the chlorine dosage required to achieve this residual is 1.6 mg/L, what is the chlorine requirement in lbs/d for a 2 mgd water plant.
In: Civil Engineering
Consider stocks of two companies A and B, the table below gives their expected returns and standard deviation Expected return for Stock A 10% Expected return for Stock B 25% Standard deviation for Stock A 12% Standard deviation for Stock B 30% Plot the risk and expected return of portfolio of these two stocks for the following correlation coefficient : -1.0,-0.5,0.0,0.5,1.0
In: Finance
Consider a gas phase reaction, 2A+B −↽−⇀− 3C+2D. When 1.00 mol A and 2.00 mol B, and 1.00 mol D were mixed and allowed to come to equilibrium at 25◦ C and ptotal = 1.0 bar, the resulting mixture contained 0.90 mol C. Calculate (a)partial pressures of each at equilibrium, (b) Keq, and (c) ∆rG.
In: Chemistry
Suppose an electric-vehicle manufacturing company estimates that a driver who commutes 50 miles per day in a particular vehicle will require a nightly charge time of around 1 hour and 40 minutes (100 minutes) to recharge the vehicle's battery. Assume that the actual recharging time required is uniformly distributed between 80 and 120 minutes.
Give a mathematical expression for the probability density function of battery recharging time for this scenario.
In: Statistics and Probability
1.
Following is the R output when fitting regression model of X= miles run per week and Y= weight loss after a year.
Coefficients:
Estimate Std. Error t value Pr(>|t|)
(Intercept) 64.28 8.11 7.93 0.015 *
X 1.23 0.63 1.96 0.188
-----------------
Signif. codes: 0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’
1
Residual standard error: 6.773 on 2 degrees of
freedom
Multiple R-squared: 0.6586, Adjusted R-squared:
0.4879
F-statistic: 3.858 on 1 and 2 DF, p-value: 0.1885
Find the Slope of the regression line.
2.
Following is the R output when fitting regression model of X= miles run per week and Y= weight loss after a year.
Coefficients:
Estimate Std. Error t value Pr(>|t|)
(Intercept) 64.28 8.11 7.93 0.015 *
X 1.23 0.63 1.96 0.188
-----------------
Signif. codes: 0 ‘***’ 0.001 ‘**’ 0.01 ‘*’ 0.05 ‘.’ 0.1 ‘ ’
1
Residual standard error: 6.773 on 2 degrees of
freedom
Multiple R-squared: 0.6586, Adjusted R-squared:
0.4879
F-statistic: 3.858 on 1 and 2 DF, p-value: 0.1885
Test the Hypothesis that Slope of the regression line is not zero. Use α=5%
3.
Which test we need to use in order to test hypotheses in multiple regression given below:
Model: Y= β0+ β1X1+ β2X2 +β3X3+β4X4 + ε β0+ β1X1+ β2X2 +β3X3+β4X4 + ε
Hypotheses
H0 : β1=β2=β3=β4=0H1 : βi≠0 for at least one βi
4.
Which test we need to use in order to test hypotheses in multiple regression given below:
Model: Y= β0+ β1X1+ β2X2 +β3X3+β4X4 + ε β0+ β1X1+ β2X2 +β3X3+β4X4 + ε
Hypotheses:
H0 : β2=0H1 : β2≠0
In: Statistics and Probability
Separated by more than 3,000 nautical miles and five time zones, money and foreign exchange markets in both London and New York are very efficient. The following information has been collected from the respective areas: London New York
Spot exchange rate ($/€) 1.3266 1.3266
1-year Treasury bill rate 3.904 % 4.505 %
Expected inflation rate Unknown 1.252 %
--------------------------------------------------------------------------
a. What do the financial markets suggest for inflation in Europe next year?
b. Estimate today's 1-year forward exchange rate between the dollar and the euro.
In: Finance
Though the electric-gasoline engine allows better miles per gallon relative to a traditional gasoline engine, it is not without technological tradeoffs. Regarding the first electric-gasoline cars to market, much of the mpg achieved was due to styling not the ability to run on electricity, which from market surveys not as appealing as the styling of a sleeker vehicle body design. New and limited infrastructure for servicing these vehicles was created, which may have deterred buyer acceptance.
Question
What fundamental technical constraints are added when incorporating an electric-gas engine into a vehicle design?
Is the inventive concept itself diluted or enhanced by the embodiment required, especially in regards to vehicle styling?
What new business operations are needed to support the new engine design?
What will drive both acceptance and sales of this new type of vehicle?
Compare the technical constraints of the electric-gasoline engine to the conventional gasoline engine.
In: Mechanical Engineering