Explanation:
Jen runs at a little under 10m per second. Ann runs about 6m per second. Jen won because her time was faster. She reached 50m by 6 seconds while it took Ann 8 seconds. If the graph displayed their motion stopping, the line would continue straight horizontally along the 50m line as they would not be running anymore.
The nucleus controls what goes in and out of the cell.
The smallest units is a formula unit
Hey there!
SiO₂ + HF → SiF₄ + H₂O
The problem here is that there is not an equal amount of O, H, or F atoms on both sides of the equation.
So let's balance!
Balance F.
1 on the left, 4 on the right. Add a coefficient of 4 in front of HF.
SiO₂ + 4HF → SiF₄ + H₂O
Balance H.
4 on the left, 2 on the right. Add a coefficient of 2 in front of H₂O.
SiO₂ + 4HF → SiF₄ + 2H₂O
Balance O.
2 on the left, 2 on the right. Already balanced.
Balance Si.
1 on the left, 1 on the right. Already balanced.
Our final balanced equation: SiO₂ + 4HF → SiF₄ + 2H₂O
Hope this helps!
Ou need a balanced equation. When butane burns it produces CO2 and H2O
so C4H10 + 13/2 O2 ------------------> 4 CO2 + 5 H2O It is easier however, to use whole numbers when trying to work this problem out so multiply everything by 2
2C4H10 + 13 O2 -------------------> 8 CO2 + 10 H2O
Now you are told you have 4.9 moles of C4H10
The equation says that for every 2 moles of C4H10 you burn you also burn 13 moles of O2
So the mole ratio is 2 to 13 OR 13/2 or you need 6.5 times as many moles of O2 as you have of C4H10.
Therefore if you start with 4.9 mol of C4H10, you will need 4.9 mol x 6.5 or 31.85 mol of O2