One student burned a piece of paper weighing 4.8 grams. The table below shows the mass of the materials formed by burning the paper. Material formed
Mass of material (in grams)
Ash
0.1
Smoke
?
Dust
2.5
What is most likely the mass of the smoke formed on burning the piece of paper?
2.6 grams
2.5 grams
2.3 grams
2.2 grams

According to the passage, which of these is true about gray water systems? a) gray water systems use plants that require less water. eliminate b) gray water systems require the use of less fossil fuels. c) gray water systems reduce the amount of fresh water used. d) gray water systems reduce the amount water used by shower heads.