Could you correct the grammatical error(#1)?

Question

I have to turn in this lab report tommorrow.
But I don't know well not only correct English writing, but also the rule of the lab report. So Somebdy help me!!!

--------Report---------
The purposes of this experiment were how to measure matter, how to use instruments correctly, how to evaluate the quality of balance, and how to determine the density of unknown solid. This experiment consisted of four small experiments
The first experiment was measuring the mass of unknown paper. In experiment A, to measure mass of a given paper, an automatic balance was used. Moreover to get more correct result, the experiment was taken six times. The first, third, fourth and sixth weighing were 3.18 g. However the second weighing was 3.20 g and the fifth weighing was 3.19 g. Thus, approximate value of the mass of unknown matter, the average of five results, was 3.185 g.

Answer 1

The purpose of this experiment was to learn how to measure matter, how to evaluate the quality of balance, and how to determine the density of an unknown solid. This experiment consisted of four smaller experiments. The firs experiment was to measure the mass of unknown paper. In experiment A, to measure the mass of a given paper, an automatic balance was used. To get a more correct result, the experiment was performed six times, The first, third, fourth, and sixth results yielded a weight of 3.18 g. However, the second test gave a weight reading of 3.20 g, and the fifth result was 3.19 g. Thus, the approximate value of the mass of the unknown matter, using the average of five results, was 3.185 g.

Answer 2

The purposes of this experiment were: how to measure matter, how to use instruments correctly, how to evaluate the quality of balance, and how to determine the density of unknown solid. (THE PREVIOUS SENTENCE COULD READ OF AN UNKNOWN SOLID OR OF UNKNOWN SOLIDS). This experiment consisted of four small experiments
The first experiment was measuring the mass of unknown paper. In experiment A, to measure mass of a given paper, an automatic balance was used. Moreover to get MOST ACCURATE result, the experiment was DONE six times. The first, third, fourth and sixth RESULTS were 3.18 g. However the second RESULT was 3.20 g and the fifth RESULT was 3.19 g. Thus, THE approximate value of the mass of unknown matter, the average of five results, was 3.185 g.

I tried to put the corrections in all capital letters so it would be easier for you see them.

Answer 3

Too short.
What was the density of the unknown solid?
What were your errors?

I can't tell if you did this lab in the 7th grade, high school or college?

If I was your teacher, I would search this forum for plagarism and report you accordingly if you copied any other poster's answer as your own.