# Posts by Wen

Total # Posts: 18

**Chemistry: Salt of weak acids and bases**

If 25 mL of 0.20M NaOH is added to 20 mL of 0.25M boric acid, what is the pH of the resultant solution?

*April 10, 2016*

**Literacy 2**

Are their any images

*June 19, 2015*

**chemistry**

If 350 grams of pure fe2o3 is used, how grams of can be produced? the reaction is: fe2+3c---2fe+3co

*March 21, 2015*

**Chem 1**

An 80.0-gram sample of a gas was heated from 25 degrees celsius to 225 degrees celsius. During this process, 346j of work was done by the system and its internal energy increased by 7785j. What is the specific heat of the gas?

*April 1, 2014*

**Math**

N is increased by 2n,the sum is 5more than 4n

*May 2, 2013*

**Math**

15 decreased by twice n equals 13

*May 2, 2013*

**math**

1.79

*August 14, 2012*

**physics**

please give a me a nice topic for my investigatory project. hope the materials also are easy to gather. thanks alot

*July 15, 2012*

**physics**

an object falls from a plane flying horizontally at an altitude of 40,000 ft at 500 mi/h. How long will it take to hit the ground?

*June 28, 2012*

**Finance**

45036

*May 16, 2012*

**Math**

A 30 year fixed rate $100,000 mortgage loan . The interest rate is 7.5% compounded monthly.After 20 years the bank is making an offer to refinance at a lower rate of 4.5% . The estimated closing costs are $3,000?

*December 12, 2011*

**algebra**

The horsepower (hp) that a shaft can safety transmit varies jointly with its speed (in revolutions per minute, or rpm) and the cube of the diameter. If a shaft of a certain material 2 in in diameter can transmit 36 hp at 75 rpm, what diameter must the shaft have in order to ...

*October 3, 2011*

**algebra**

A motorboat can maintain a constant speed of 24 mph relative to the water. The boat makes a trip upstream to a certain point in 62 minutes. the return trip takes 34 minutes. What is the speed of the current?

*September 20, 2011*

**differential calculus**

a right circular cylinder has a fixed height of 6 units. Find the ratio of change of its volume(v) with respect to the radius(r) of its base.

*July 27, 2011*

**differential calculus**

Find how fast (a) the circumference (b)the area, if a cicle increases when the radius increases.

*July 27, 2011*

**differential calculus**

a right circular cylinder has a fixed height of 6 units. Find the ratio of change of its volume(v) with respect to the radius(r) of its base.

*July 27, 2011*

**windows xp and vista**

Cheater...hopefully you failed.

*June 9, 2010*

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