Answer:
The molecules of oxygen should be placed as reactants in the equation.
Explanation:
1: N₂ + O₂ → 2NO
2: 2NO + O₂ → 2NO₂
complete reaction:
N₂ + 2O₂ → 2NO₂
- In both intermediate equations' oxygen is used as reactant because the end product is the product of the combination of nitrogen and oxygen. So in the complete or overall reaction, oxygen should also be placed as reactant.
We can not place oxygen at the side of products neither we can cancel it because, products can only be obtained at the end of the reaction but according to the equations' oxygen is not the end product of the reaction. But the addition into the reaction (Eq. 2) to make the new product.
Also, we can not cancel it because to cancel out molecules of oxygen should be present at the both sides with same amount in the stoichiometric equation.
Hence, in a balanced chemical equation, oxygen should be written as a reactant by using the correct number of moles.
.4 M means that in 1 Liter of solution there are .4 moles.
Molarity x Liters = Moles
We have molarity, so convert mL to liters
250 mL x 1000mL/1 Liter = .25 L
Now, set up the equation
.4 M x .25 L = .1 moles of solute
to help create food establishment.
Answer : The question is to write the elements alphabetically and seperating them with commas.
So in this case for your question of Fireworks , K
,
The answer will be
K, N, O.
You have to just differentiate the elements and write them according to the alphabetical order.
Answer:
CaCl₂
Explanation:
First we <u>convert the given masses of elements into moles</u>, using <em>their respective molar masses</em>:
- 0.900 g Ca ÷ 40 g/mol = 0.0225 mol Ca
- 1.60 g Cl ÷ 35.45 g/mol = 0.045 mol Cl
Now we divide those numbers of moles by the lowest value among them:
- 0.0225 mol Ca / 0.0225 mol = 1
- 0.045 mol Cl / 0.0225 mol = 2
Meaning the empirical formula for the compound is CaCl₂.