The number of oxygen atoms that are in 4 Al₂O₃ are 12 atoms
<u><em> Explanation</em></u>
- The subscript in a chemical formula indicate the number of atoms of element immediately before the subscript.
- coefficient is the number in front of the formula and tells us how many molecules of a given formula are present.
- Since 4Al₂O₃ has coefficient of 4 and the subscript of O is 3 the number of O atoms = 4 x 3=12 atoms
Answer:
34.32 oz
Explanation:
1.- The carpet has the dimension 12 x 11 ft, so it has an area = 12 x 11 = 132 ft2
To convert the Ft2 into yd2:
9 ft2 = 1 yd2
132 ft2 = x X = (132 x1) / 9 = 14.6 yd2
2.- By now, it is now that the 39 % is burned, so obtain the 39 % of 14.6 yd2
14.6 yd2 = 100 %
x = 39 % x = (39 x 14.6) / 100 = 5.72 yd2
3.- It is known that 30 oz acrylan /yd2
30 oz = 1 yd2
x = 5.72 yd2 X = (5.72 x 30) /1 = 171.6 oz
4.- It is assume that just the 20 % of the fibers has HCN
171.6 oz = 100 %
x = 20 % X = (20 x 171.6) /100 = 34.32 oz
Answer:
B. all organisms are made of at least one cell.
C.cells are the building blocks of life.
D.all cells come from preexisting cells
Explanation:
According to the cell theory that was proposed via the contribution of three scientists in 1830's namely: Matthias Schleiden, Theodor Schwann, and Rudolf Virchow, the following was stated:
- Cells are the basic and fundamental unit of life
- Living organisms are made up of one or more cells
- All cells arise from pre-existing cells.
From the above components, the following are said to be true and correlate with the universal cell theory:
B. all organisms are made of at least one cell.
C.cells are the building blocks of life.
D.all cells come from preexisting cells
Answer:
60 mph (miles per hour)
Explanation:
0.5 hours is 1/2 of an hour, so to get the number of miles for a whole hour you multiply the miles ran by 2.
30 times 2 is 60.