05/16/18

What is the mass of a sample of O2 gas?
Which has a pressure of 740. mmHg, at a temperature of 25 degree Celsius, in a volume of 250. mL?  I tried figuring this out myself by putting (740)(o.25)/ (0.0821)(298) but I am not getting the... more
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05/16/18

A 367 mL air sample collected at 46◦C has a pressure of 551 torr. What pressure will the air exert if it is allowed to expand to 598 mL at 54◦C?
Its a question dealing with combines gas laws 
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05/16/18

how many grams of h2o are needed to produce 150 g of mg(oh)2?
The formula is Mg3N2 + 6H2O---> 3Mg(OH)2 + 2NH3. I tried solving this equation and got 130 grams, then found out it was actually 93 grams but I can't figure out what I must have done wrong.
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05/16/18

when 160. g of ch4 are mixed with 85g of o2 what is the maximum amount of co2 that can be produced
I am stuck on this question can someone help me please.
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05/16/18

Of the elements B C F Li Na. The element with the largest atomic radius is?
 My guess is Na, because if I am correct the radius increases going down  group.
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05/16/18

iodine-131 has a half-life of 8 days If start with 2g of iodine-131, how much will remain after 30 days?
hospital utilize the radioactive substance iodine-131 with a half-life of 8 days in the diagnosis of thyroid gland. If hospital acquires 2g of iodine-131, how much of this sample will remain after... more
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05/16/18

At STP, what is the mass of 11.2 liters of O2 gas?
I tried solving this myself and got 16.0 g, but wasn't quiet to sure if I did the problem right.
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05/16/18

Which of the following is a buffer system?
A. NaCl and NaNO3   B. H2CO3 and KHCO3   C. HCl and NaOH   D. H2O and HCl   E. NaCl and NaOH
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05/16/18

Which of the following is the weakest acid?
A.  HF (KA for HF is 7.2 x 10-4) B.  H3BO3 (Ka for H3BO3 is 5.4 x 10 -10) C.  HCNO (ka for HCNO is 2 x 10-4) D.  HCN (ka for HCN is 4.9 x 10-10)
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05/16/18

For the reaction: 2 H 2 O + 137 k c a l → 2 H 2 ( g ) + O 2 ( g ) how many kcal are needed to form 100. g h2o ( g ) ?
I tried solving this and got 380. Kcal, but I wasn't sure if my answer is incorrect because I struggled with the set up of the equation at the beginning.
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05/16/18

the name of Al2(SO4)3 is..
Aluminum sulfate, but my question is is why? At first, I thought the answer was Aluminum (III) Sulfate because of the 3 behind the parenthesis but apparently that isn't correct. Can you explain to... more
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05/16/18

What volume of fluorine reacts if 12 liters of oxygen are produced in the reaction Al2O3 + F2 yields O2 + AlF3
I need these answers so I can pass the class you got me?  
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05/16/18

write chemical, complete ionic and net ionic equations for the reaction between CaCl2 and NaCO3
I cannot figure it out, although i think that it has something to do with a double replacement reaction.
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05/15/18

What chemical property is present in substances that react slowly to oxygen?
Science question
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05/15/18

Is .913mg in the range of .07mg and .11mg?
I am trying to figure the level of Cadmium in our water.  The test resulted in .913mg but the level should be between .07mg and .11mg.  
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05/15/18

The nurse told him that the upper limit of his systolic blood pressure is equal to half his age increased by 110
Heather is with her grandfather to check his blood pressure. The nurse told him that the upper limit of his systolic blood pressure is equal to half his age increased by 110   a. 'a' is the age... more
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05/15/18

A student titrates an unknown amount of KHP with 20.46 mL of a 0.1000M NaOH solution.What was the mass of KHP was titrated by the sodium hydroxide solution
Molar mass of KHP is 204.22  KHP has one acidic hydrogen 
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05/14/18

Him kippur is the Jewish new year
This is a Jewish question. If you didn’t know it then don’t answer it with a wrong answer. This auestion is for my homework.
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05/14/18

Half Reaction Problem
These are the two half reactions: Oxaloacetate+2H++2e-=malate (-0.166) =E0(V)Fumarate+2H++2e-=succinate (+0.031)=E0(V)1. Which of the oxidizing agents is stronger? (Professor said fumarate) 2.which... more
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05/14/18

The solution containing 6.8g of non ionic solute in 100g water was found to freeze at -0.93℃ . If kf for water is 1.86 the molar mass of solute is
I need the answers immediately please help me
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05/14/18

At what rate of sublimation and deposition there is in the ice 173 K set at a room temperature?
A sample of dry ice (solid CO2) is cooled to 173 K and is set on a table at room temperature. At what temperature is the rate of sublimation and deposition the same? (ASSUME THAT THE PRESSURE IS AT... more
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05/14/18

iron crystallizes in a body-centered unit cell with an edge length of 287 pm. what is the atomic radius of iron
What is the atomic radius of iron? Show all steps please! 
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05/13/18

what is the solubility in mol/L of copper (I) sulfide, Cu2S? Its Ksp value is 6.1x10^-49
what is the solubility in mol/L of copper (I) sulfide, Cu2S? Its Ksp value is 6.1x10^-49
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05/13/18

Please help! Half reaction problem.
I need help figuring these two half reaction problems out:?My professors explanation made no sense to me so im hoping someone can help me out. These are the two half reactions:... more
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05/13/18

how would i solve this?
Barium sulphide will be prepared by reduction of barium sulphate by carbon. How many grams of barium sulphate would you weigh to prepare 25 g of barium sulphide?
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