# Posts by Yamy

Total # Posts: 9

Chemistry

Chemistry
Step 1: (0.5*9110.0 - 9110.0)/ (200.5 - 9110.0)= erf(ξ) Step 2: erf(ξ < 0.6), use the approximation erf ξ = ξ Step 3: t= d^2/4*D*ξ^2 d=88.5 x 10-2 cm D=3.091 x 10-7 cm2/s Step 4: t in sec -> hours Conversion seconds to hours is total/(60x60)

Chemistry
Step 1: (0.5*9110.0 - 9110.0)/ (200.5 - 9110.0)= erf(ξ) Step 2: erf(ξ < 0.6), use the approximation erf ξ = ξ Step 3: t= d^2/4*D*ξ^2 d=88.5 x 10-2 cm D=3.091 x 10-7 cm2/s Step 4: t in sec -> hours Conversion seconds to hours is total/(60x60)

CHEMISTRY
5.00*10^22 / (gallium level*10^-8)

Chemistry
I agree I) is wrong

Chemistry
Same here, can anyone show how to insert the data into the formulas. Thank you

Chemistry
Step 1: (0.5*7865 - 7865)/ (193.5 - 7865)= 0.512611614417(erf(ξ)) Step 2: erf(ξ < 0.6), use the approximation erf ξ = ξ Step 3: t= d^2/4*D*ξ^2 t=(59.0x10^-2)^2/4(3.091 x 10^-7)(0.512611614417)^2 t=0.3481/3.2488965297e-07 t=1071440.70862 d=59.0 x 10-...

Chemistry
Could someone fill the data above into the formula, so we can get an idea how to search the answer? Thank you

Chemistry
Don't think its a correct answer!

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