100 cm³ of 2.0 mol dm‐³ hydrochloric acid is poured into 100 cm³ of 2.0 mol dm‐³ sodium hydroxide solution. The initial and final temperature are immediately recorded as shown below. [Specific heat capacity = 4.2 J/g°C, density of solution = 1.0 gcm-3]. What is the value of heat released in the reaction? initital temperature of hydrochloric acid: 29.0°C

initial temperature of sodium hydroxide solution: 29.0°C

highest temperature of the mixture: 35.0°C

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it is stable as it is in group 0 which have full outer shells of electrons

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