La disolución de cloruro de calcio, CaCl2, es un proceso exotérmico, su calor de disolución es - 81.35 kJ mol-1. Calcular la temperatura, en °C, alcanzada por la solución cuando 20.00 g de cloruro de calcio se disuelven en 0.080 kg de agua a 20.00°C, en un calorimetro a presion constante, cuya capacidad calorifica es 320.0 J °C-1. El calor especifico de la solución es 4.184 J g-1 °C-1.

a. hope i'm right

explanation:

you didnt put any of the following

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