Which ester, when treated with NaOEt, gives this Claisen condensation product? 1. (CH_3)_2CHCH_2CO_2CH_2CH_3 2. (CH_3)_2CHCH_2CH_2CO_2CH_2CH_3 3. (CH_3)_2CHCH_2CH_2CH_2CO_2CH_2CH_3 4. CH_3CH_2CH(CH_3)CH_2CO_2CH_2CH_3

is it a purebred? it looks more like a red nose, but it doesn't have the red could it be a staffordshire bull terrior? unsure if that's the right name for it sorry

percent abundance for cu-63 can be shown as:

63 x + 65 (1-x) = 62.9296

65 - 62.9296 = 2 x

x = 1.035

thus, percent abundance for cu-63 is 1.035

percent abundance for cu-65 can be shown as:

63 x + 65 (1-x) = 64.9278

65 - 64.9278 = 2 x

x = 0.0361

thus, percent abundance for cu-63 is 0.0361

the mass spectrum of cu-63 showing the intense peak as, this isotope is found in nature more abundantly around 92.38 % in comparison to cu-65 which is found 62.58 % naturally