Ask a New Question
Search
Questions and answers by
Kearstyn
Questions (5)
How is this question done?
The percent abundance of deuterium (2H isotope) in naturally occurring hydrogen is 1.4x10¯2 mole %.
1 answer
525 views
How is this question solved?!
When 21.6g of a metal X are burned in excess oxygen, 40.8g of X2O3 are formed. From this data, what
7 answers
1,374 views
I can't solve this! I keep trying but I can't get it.
Suppose 25mL of 1.00M HCl is added to 50mL of 1.00M HF. What is the pH of
1 answer
447 views
When 50.0mL of 0.100M NH3 (Kb=1.8x10^-5) solution is mixed with 20.0mL of of 0.250M HCl solution, what is the pH after reaction?
1 answer
840 views
When 50.0mL of 0.100M NH3 (Kb=1.8x10^-5) solution is mixed with 20.0mL of of 0.250M HCl solution, what is the pH after reaction?
1 answer
671 views
Answers (3)
Ah! That makes sense! Thanks so much!
4X + 3O2 --> 2X2O3 21.6g 40.8g Oxygen used= 40.8g-21.6g= 19.2g moles O2= 19.2 /MM = 19.2/32 = 0.6 3/0.6 = 2/x therefore, x = 0.4 moles MM=40.8/0.4 = 102 Not sure what is wrong?! Thanks very much!
I am still completely stuck. I did this and I got 102 for the molar mass. The answer should be around 26-27; the answer posted indicates that Al is the element in question. Thanks, again.
