Answer:
The answer to your question is: 3000 cm
Explanation:
30 meters long to cm
We can use a rule of three to solve it
We know that 1 meter ------------------ 100 cm
30 meters ---------------- x
x = 30(100)/1 = 3000 cm
A dependent variable is something that whose value depends on another.
a independent variable is something <span> manipulated to determine the value of a dependent </span>variable<span>
a constant is something you do not change</span>
Methane (CH4) and oxygen (O2) react to produce carbon dioxide (CO2) and water (H2O). CH4 and O2 are the reactants, while CO2 and H2O are the products.
Answer:
Explanation:
To convert from molecules to moles, we must use Avogadro's Number: 6.022*10²³. This tells us the amount of particles (atoms, molecules, etc.) in 1 mole of a substance. In this case, the particles are molecules of water.
Multiply by the given number of molecules.
Flip the fraction so the molecules of water cancel.
The original measurement of atoms has 2 significant figures ( 4 and 3), so our answer must have the same. For the moles we calculated, that is the tenth place. The 4 in the hundredth place tells us to leave the 1.
There are about 7.1 moles of water.
Answer:
Mass = 7.2 g
Explanation:
Given data:
Mass of ZnO = 36.9 g
Mass of oxygen needed = ?
Solution:
Chemical equation:
2Zn + O₂ → 2ZnO
Number of moles of ZnO:
Number of moles = Mass/ molar mass
Number of moles = 36.9 g/81.38 g/mol
Number of moles = 0.45 mol
Now we will compare the moles of ZnO with oxygen:
ZnO : O₂
2 : 1
0.45 : 1/2 × 0.45 = 0.225
Mass of oxygen:
Mass = number of moles × molar mass
Mass = 0.225 mol × 32 g/mol
Mass = 7.2 g