Question

applying scientific methods
a chemistry student is given the task of analyzing three unknown samples. her data is listed in data table 1. use data table 1 to answer the questions below.
data table 1

trial	sample a		sample b		sample c
1	80.72	10.01	95.41	10.72	72.28	10.00
2	80.64	10.00	92.33	10.51	72.32	9.99
3	80.91	10.05	93.78	10.62	72.34	9.95
avg	80.76	10.02	93.84	10.62	72.30	9.98

1. based on the data given, what is the density of each sample? follow the rules for significant figures and rounding for your answers. show your work

sample a ____________
sample b ____________
sample c ____________

1. compare the data for each trail and each sample in data table 1. which sample(s) did the student measure precisely? explain your answer.

Explanation:

Step1: Recall density formula

The density formula is $
ho=\frac{m}{V}$, where $
ho$ is density, $m$ is mass and $V$ is volume.

Step2: Calculate density of Sample A

Using the average values, $m = 80.76$ g and $V=10.02$ mL. So, $
ho_A=\frac{80.76}{10.02}\approx8.06$ g/mL.

Step3: Calculate density of Sample B

Using the average values, $m = 93.84$ g and $V = 10.62$ mL. So, $
ho_B=\frac{93.84}{10.62}\approx8.84$ g/mL.

Step4: Calculate density of Sample C

Using the average values, $m = 72.30$ g and $V=9.98$ mL. So, $
ho_C=\frac{72.30}{9.98}\approx7.24$ g/mL.

Answer:

Sample A: 8.06 g/mL
Sample B: 8.84 g/mL
Sample C: 7.24 g/mL