Wednesday
December 4, 2013

# Posts by helpme

Total # Posts: 31

Chemistry
Hi Im reposting incase my original post doesn't get read. Please see bottom for additional info that I need help getting verified. Many thanks Hi Please help verify my answer to the following question: 0.500g of pure phosphorous was burned in excess pure oxygen to give a p...

Chemistry
Here is wht I did if you can please tell me where I went wrong would be appreciated. resulting compound phosphorous oxide mass = 1.145g # of moles of Phosphorus = 0.500g/30.97g/mol = 0.0161446mol # of grams of combined phosphorus oxide = 1.145g-0.500g (P) = 0.645g of oxygen #o...

Chemistry
Hi Please help verify my answer to the following question: 0.500g of pure phosphorous was burned in excess pure oxygen to give a product that has a mass of 1.145 g. What is the empirical formula of the resulting compound? By the use of a mass spectrometer the molecular mass of...

Physics
A ball on the end of a string is revolved at a uniform rate in a vertical circle of radius 72.0 cm, as shown in Fig. 5–33. If its speed is .4 00 m s and its mass is 0.300 kg, calculate the tension in the string when the ball is (a) at the top of its path, and (b) at the b...

physics
What is the instantaneous velocity of a freely falling object 28 s after it is released from a position of rest? The acceleration of gravity is 9.8 m/s2 . 2)What is its average velocity during this 28 s interval? 3) How far will it fall during this time?

Chem

Chem
Do you have to divide again by 760?

science
The fact that marble,chalk and limestone all contain calcium carbonate is a problem. Explain why and give examples.

math
Mrs. Brighton invested \$30,000 and received a total of \$2,300 in interest. If she invested part of the money at 10% and the remainder at 5%, then how much did she invest at each rate?

math
Solve the following system of equations. x+y=13 22x+36y=356

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