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2 years ago

Balance the combustion reaction between octane and oxygen. 2C8H18 + O2 → CO2 + H2O

Chemistry

2 answers:

Ber [7]2 years ago

6 0

Explanation:

A balanced reaction is a reaction where there are equal number of atoms on both reactant and product side.

For example, $2C_{8}H_{18} + O_{2} \rightarrow CO_{2} + H_{2}O$

Number of atoms on reactant side are as follows.

C = 16

H = 36

O = 2

Number of atoms on product side are as follows.

C = 1

H = 2

O = 3

Therefore, in order to balance the equation we multiply $O_{2}$ by 25 on reactant side and multiply $CO_{2}$ by 16 and $H_{2}O$ by 18.

Thus, the balanced chemical equation will be as follows.

$2C_{8}H_{18} + 25O_{2} \rightarrow 16CO_{2} + 18H_{2}O$

nika2105 [10]2 years ago

5 0

The answer is 2C8H18 + 25O2 ⇒ 16CO2 + 18H2O<span />

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Mercury(II) oxide (HgO) decomposes to form mercury (Hg) and oxygen (O2). The balanced chemical equation is shown below.

IceJOKER [234]

2HgO=2Hg + O2
433,18 g. = 32 g
x. = 250 g
x= 3 384,21875 g of HgO is needed

4 0

3 years ago

PLEASE ANSWER FAST

Elis [28]

First we need to calculate the number of moles of FeS $_{2}$ :

number of moles = mass (grams) / molecular mass (g/mol)

number of moles of FeS $_{2}$ = 198.2/120 = 1.65 moles

From the chemical reaction we deduce that:

if 4 moles of FeS $_{2}$ produces 8 moles of SO $_{2}$

then 1.65 moles of FeS $_{2}$ produces X moles of SO $_{2}$

X = (1.65×8)/4 = 3.3 moles of SO $_{2}$

Now we can calculate the mass of SO $_{2}$ :

mass (grams) = number of moles × molecular mass (grams/mole)

mass of SO $_{2}$ = 3.3×64 = 211.2 g

7 0

3 years ago

She introduced 0.174 moles of nobr(g) into a 1.00 liter container, she found the equilibrium concentration of br2(g) to be 1.79×

Nastasia [14]

The equilibrium reaction is

2 NOBr ⇄ 2 NO + Br₂

The initial molarity of NOBr is 0.174 mol/1 L = 0.174 M. Let's apply the ICE approach which stands for Initial-Change-Equilibrium.

2 NOBr ⇄ 2 NO + Br₂
I 0.174 0 0
C -2x +2x +x
----------------------------------------------------
E 0.174-2x 2x x

Since E for Br₂ is 1.79*10⁻² M, then that means x = 1.79*10⁻² M. We can compute E for the other compounds.

E for NOBr = 0.174 - 2(1.79*10⁻²) = 0.1382 M
E for NO = 2(1.79*10⁻²) = 0.0358 M

The expression for Kc according to the reaction is:
Kc = [NO]²[Br₂]/[NOBr]²
Kc = [0.0358]²[1.79*10⁻²]/[0.1382]²
<em>Kc = 1.2×10⁻³</em>

6 0

3 years ago

How many grams are in 2.7 mol of Fe?

SVETLANKA909090 [29]

Answer:

150.7815

Explanation:

In chemistry, the formula weight is a quantity computed by multiplying the atomic weight (in atomic mass units) of each element in a chemical formula by the number of atoms of that element present in the formula, then adding all of these products together.

A common request on this site is to convert grams to moles. To complete this calculation, you have to know what substance you are trying to convert. The reason is that the molar mass of the substance affects the conversion. This site explains how to find molar mass.

3 0

2 years ago

An unopened 350 mL can of diet Dr. Pepper will float in a lake. However, it’s also true that an unopened 350 mL can f regular Dr

iren [92.7K]

Answer:

Diet Dr. Pepper

Explanation:

The density of an object and the liquid involved determines if that particular object will float or sink in the particular liquid. An object will FLOAT if its density is lower than that of the liquid substance while it will SINK if its density is higher than that of the liquid substance.

In this case, water (lake) is the liquid substance. According to the question, an unopened 350 mL can of DIET Dr. Pepper will float in a lake because it is less dense than the water while an unopened 350 mL can of REGULAR Dr. Pepper will sink because it is more dense than water.

Hence, the DIET type of soda is the least dense

7 0

3 years ago