Homework Statement
When a 10.0g sample of a mixture of CH4 and C2H6 is burned in excess oxygen, exactly 525 KJ of heat is produced. What is the percentage by mass of CH4 in the original mixture?
Given: CH4(g) +2 O2(g) -> CO2(g) + 2 H2O(l) \DeltaH= -890.4 KJ
C2H6(g) + \frac{7}{2} O2(g)...
1) Simply use the molar masses provided by the periodic table to calculate the molar mass. So you'd take 40.00g (Ca) +2(35.45g Cl) + 4(1.01g H) + 2(16.00g) to find your molar mass.
2) Divide 2.97 g by the molar mass of CaCl2•2H20(aq) you got in 1). Using stoichiometry, CaCl2•2H20(aq) to...
Oh, wow. Sigh, I hate it when you take the wrong approach in proving Left Side equals Right Side.
Thanks for the help! Can't believe it was so simple after your suggestion :).
Homework Statement
Prove:
1/log3a + 1/log4a = 1/log12a
Homework Equations
ay=x
Logarithms rules (addition, subtraction, power, etc.)
logax=logbx/logba
The Attempt at a SolutionLeft Side:
1/log3a + 1/log4a
=log3a+log4a/log12a (via common denominator)
The problem is how to add logarithms...
Thanks tiny-tim :)
Took me a long time because my physics teacher today added a portion for this question, that you also have to find the time interval for the second timer Rock B will hit Rock A (after B bounces off of C).
Homework Statement
Matthew and Amanda have challenged Trevor and Julie to a curling match, played with perfectly elastic rocks sliding on level frictionless ice. Three rocks are lined up all in a row (perfectly straight line). B is a junior rock and its mass is exactly half of A or C. B and C...