Which of the following is a proper use for a calorimeter? a) measuring heat of combustion b) measuring temperature of a mixture c) measuring the amount of oxygen consumed in a combustion reaction d) measuring entropy of a reaction

a) Measuring heat of combustion

Explanation:

Calorimeter -

It is an instrument which is used for the measurement of the heat for various physical changes or chemical reaction .

The amount of heat released or absorbed can be measured by using calorimeter .

The device is commonly used for the study of chemistry , thermodynamics , etc.

Hence , the proper use of a calorimeter is ( a ) .

(a) heat of combustion

Explanation:

A Calorimeter basically is used for measuring heat of combustion. commercially it is referred to as a bomb calorimeter.

Temperature is measured ny an instrument called thermometer.

The amount of oxygen consumed in a combustion process is determined by  stoichiometric calculations.

Entropy can not really be measured using an instrument, but can be determined from the heat of a reaction and temperature

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