Question

for parts of the free response question that require calculations, clearly show the method used and the steps involved in arriving at your answer. you must show your work to receive credit for your answer. examples and equations may be included in your answers where appropriate. answer the following questions related to the analysis of cabr₂. (a) a student has a 10.0 g sample of cabr₂. show the setup of the calculation to determine the number of moles of cabr₂ in the sample. include units in the setup. (you do not need to do any calculations.)

Explanation:

Step1: Recall the formula for moles

The formula to calculate the number of moles (\(n\)) is \(n=\frac{m}{M}\), where \(m\) is the mass of the substance and \(M\) is the molar mass of the substance.

Step2: Identify values and molar mass

The mass \(m = 10.0\space g\) (mass of \(CaBr_2\) sample). The molar mass of \(CaBr_2\) is calculated as: molar mass of \(Ca\) is \(40.08\space g/mol\), molar mass of \(Br\) is \(79.90\space g/mol\), so \(M = 40.08 + 2\times79.90=40.08 + 159.8 = 199.88\space g/mol\).

Step3: Set up the calculation

Substitute \(m = 10.0\space g\) and \(M = 199.88\space g/mol\) into the moles formula: \(n=\frac{10.0\space g}{199.88\space g/mol}\)

Answer:

The setup for the number of moles of \(CaBr_2\) is \(\frac{10.0\space g}{199.88\space g/mol}\)