<span>Answer: yes, when you balance a chemical reaction, you are making sure that the law of conservation of matter is obeyed.
</span>
<span /><span /><span>
Justification:
</span><span />
<span>1) When you balance a chemical reaction, you add the coefficients to make the number of atoms of each element in the left side of the equation (reactants) equal to number of atoms of the same elements in the right side (products).
</span><span />
<span>2) Since, each atom has a unique atomic mass associated, it results, necessarily, that the mass of the atoms of the reactants is equal to the mass of the atoms of the products</span>.
For
the reaction 2SO2 + O2 -> 2 SO3, we first determine which is the excess
reactant between SO2 and O2. We list down the molar mass of the reactants:
Molar
mass of SO2 = 64.0638 g/mol
Molar
mass of O2 = 32 g/mol
Using
the stoichiometry of the reaction, we then calculate the amount of oxygen that
will react with 90.0 g of SO2.
90.0
g SO2 x 1 mol SO2/64.0638 g x 1 mol O2/ 2 mol SO2 x 32 g O2/mol = 22.4776 g O2
<span>
</span>
<span>Thus,
we can conclude that O2 is the excess reactant while SO2 is the limiting
reactant. Subtracting 22.4776 g O2 from the initial 100.0 g O2, we get 77.5224
g O2 left after the complete reaction of 90.0 g SO2. </span>
Answer:
The answer is
<h2>126.58 mL</h2>
Explanation:
The volume of a substance when given the density and mass can be found by using the formula
<h3>
![volume = \frac{mass}{density}](https://tex.z-dn.net/?f=volume%20%3D%20%20%5Cfrac%7Bmass%7D%7Bdensity%7D%20)
</h3>
From the question
mass of alcohol = 100 g
density = 0.79 g/mL
The volume is
![volume = \frac{100}{0.79} \\ = 126.58227848...](https://tex.z-dn.net/?f=volume%20%3D%20%20%5Cfrac%7B100%7D%7B0.79%7D%20%20%5C%5C%20%20%3D%20126.58227848...)
We have the final answer as
<h3>126.58 mL</h3>
Hope this helps you
Hey there!
Molar mass SO₂ = 64.066 g/mol
Therefore:
1 mole SO₂ -------------------- 64.066 g
(moles SO₂ ) ??---------------- 5.0 g
( moles SO₂) = 5.0 * 1 / 64.066
(moles SO₂) = 5.0 / 64.066
moles = 0.0780 moles of SO₂
Hope this helps!
Answer: d) -705.55 kJ
Explanation:
Heat of reaction is the change of enthalpy during a chemical reaction with all substances in their standard states.
![\Delta H=+1411.1kJ](https://tex.z-dn.net/?f=%5CDelta%20H%3D%2B1411.1kJ)
Reversing the reaction, changes the sign of ![\Delta H](https://tex.z-dn.net/?f=%5CDelta%20H)
![C_2H_4(g)+3O_2(g)\rightarrow 2CO_2(g)+2H_2O(l)](https://tex.z-dn.net/?f=C_2H_4%28g%29%2B3O_2%28g%29%5Crightarrow%202CO_2%28g%29%2B2H_2O%28l%29)
![\Delta H=-1411.1kJ](https://tex.z-dn.net/?f=%5CDelta%20H%3D-1411.1kJ)
On multiplying the reaction by
, enthalpy gets half:
![0.5C_2H_4(g)+1.5O_2(g)\rightarrow CO_2(g)+H_2O(l)](https://tex.z-dn.net/?f=0.5C_2H_4%28g%29%2B1.5O_2%28g%29%5Crightarrow%20CO_2%28g%29%2BH_2O%28l%29)
![\Delta H=\frac{1}{2}\times -1411.1kJ=-705.55kJ/mol](https://tex.z-dn.net/?f=%5CDelta%20H%3D%5Cfrac%7B1%7D%7B2%7D%5Ctimes%20-1411.1kJ%3D-705.55kJ%2Fmol)
Thus the enthalpy change for the given reaction is -705.55kJ