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December 7, 2013

Posts by connie

Total # Posts: 204

Chem >Jai
Posted by Connie on Saturday, September 10, 2011 at 10:36am. What is the amount of energy of calories to heat 8.5g of water from 15 C to 36 C? I think you take 8.5g x 21 degree C, but then I am stuck. Thank you Chem - Jai, Saturday, September 10, 2011 at 10:50am amount of ener...

Chemistry
What are the joules needed to melt 50.0g of ice at 0 degree C and to warm the liquid to 65.0 degree C? Thank YOu

Chem
Energy needed to keep a 75w bulb burning for 1 hour = 270kj Calculate energy neede to keep it burning for 3 hours? In J and kcal? I got the J: It is 270kj x 1000/1 x 3/1 = 810000=8.1 x 10^5J But How Do I get the kcal? Thank you

Chem
What is the amount of energy of calories to heat 8.5g of water from 15 C to 36 C? I think you take 8.5g x 21 degree C, but then I am stuck. Thank you

Chemistry
What is the mass of 36.0mL of a liquid if its density is 2.70g/mL? is the right answer 97.2 g?

Chemistry
The average adult has about 9.0 pints of blood. If 20 drops of blood is = to 1 mL. How many drops of blood does the average human contain? Is the answer 85,1400 drops or 85,000 drops or neither? Thanks!

Chemistry
Caffeine is 49.47% carbon, 5.19% H, 28.8%N and 16.48% O. What is mass of carbon in 37.1g of caffeine?

Math
(1.0900 x 10to the 4th) X (2.098X 10 to the 14th) divided by (7.45x 10 to the negative 6th power)

math
[7-(-8)]|-6|=

chemistry
a patient receives 250 mL of a 4.0% (m/v) amino acid solution twice a day. a) how many grams of amino acids are in 250mL of solution? b) how many grams of amino acids does the patient receive in one day? For a) I came up w/10g and for b) I came up w/ 20g in 1 day. Is this righ...

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