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Posts by Vikki

Total # Posts: 24

Chemistry
if a flask of 750 ml of 0.80m of nacl solution was left, and 275 ml evaporated, what is the new concentration

Chemistry
If 6.0g of CH4 and 5.0g of O2 are used, what is the mass of CO2 produced?

chm
The equilibrium constant for the equation 2 H2(g) + CO(g) CH3OH(g) Is 19 at a certain temperature. If there are 3.11 x 10-2 moles of H2 and 5.79 x 10-3 moles of CH3OH at equilibrium in a 6.75 L flask. What is the concentration of CO? What is the Kp at 1439 °C for the ...

chm
The equilibrium constant for the equation 2 H2(g) + CO(g) CH3OH(g) Is 19 at a certain temperature. If there are 3.11 x 10-2 moles of H2 and 5.79 x 10-3 moles of CH3OH at equilibrium in a 6.75 L flask. What is the concentration of CO? At 1280 °C the equilibrium constant for...

Biology 12
The question is asking to calculate the overall energy change in the combustion of ethane (C2H6). This is what I have done: The balanced equation: C2H6 + 6 O2 --> 2 CO2 + 3 H2O (6) 411 + 346 + (6) 494 --> (2) 799 + (3) 459 2466 + 346 + 2964 --> 1598 + 1377 = 5776 = ...

Biochem 12
Calculate the energy released per gram of propane when it is burned in a combustion reaction. The chemical formula for propane is C3H8.

chm
An aqueous solution that is 10.0 percent sulfuric acid (H2SO4) by mass has a density of 1.143 g/mL. Determine the molality of the solution. ( 3 significant figures)

12 U Math
Solve and check for extraneous roots. log_2x+log_2(x+2)=3 * _2 is a subscript and (x+2) isn't a superscript*

Math
Solve the equation. Check for extraneous roots. 4^2x-4^x-20=0

Trigonometry
A variant on the carousel at a theme park is the swing ride. Swings are suspeneded from a rotating platform and move outward to form an angle x with the vertical as the ride rotates. The angle is related to the radial distance,r, in metres, from the centre of rotation; the ...

Math Gr 12
Use a calculator to determine angle x, rounded to the nearest degree. csc x = 1.25

english
According to Jean Piaget, in what is all learning based? A. Sensorimotor learning B. Preoperational learning C. Concrete operational learning D. Formal operational learning 2. Which of the following questions is a thinker/doer most likely to ask? A. Why? B. What? C. How? D. ...

East Asia,and south easia
With respect to human rights issues in Southeast Asia, which statement is most accurate?

Probability
Suppose that an unfair coin comes up heads 54.1% of the time. The coin is flipped a total of 13 times. a) What is the probability that you get exactly 6 heads? b) What is the probability that you get exactly 6 tails? c) What is the probability that you get at most 9 tails?

TRIG
tan^-1(5.5/6.2) =41.6 ^^^using a TI-84 PLUS^^^

U.S. History
One example of government trying to help American business was a) high tariffs. b) patronage c) blue laws d) Munn v. Illinois

world history
Civilizations in the Americas and sub-Saharan Africa were isolated from Eurasia mostly because of?

algebra
Got hung up with what to do about the 7 and did not attach the 9 to the left side. Thank you!

algebra
2x+(x-y)^3 when x=9 and y=7 This problem is from a test review sheet (answer included)I have almost filled a notebook trying to solve this.

world issues
Is fair trade a solution for farmers in the developing world?

SraJMcGin,
thankyou ! :)

Geography
please could someone help me answer these questions ...? globalisation brings many problems describe all the benefits in all the different stages of production and countries. globalisation brings many benefits describe all the benefits in all the different stages of production...

Org. Chem.
The alkene would be formed via an E1 mechanism because it is formed by an elimination reaction in a dehydration reaction between n-butyl alcohol, a primary alcohol, and sulfuric acid, an obviously strong acid. The ether would be formed via Williamson ether synthesis, which is ...

math
three-fourths of a gallon is how many eights of a gallon?

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