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3 years ago

6

Please help me!!!!!!

1 answer:

Natalka [10]3 years ago

7 0

I think it should be 2.358

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Elements are identified by their atomic number because

o-na [289]

I think its Either B or C

7 0

4 years ago

Write the balanced equation for the combustion of isooctane to produce water vapor and carbon dioxide gas.Assuming gasoline is i

tangare [24]

Answer:

The yield is 16 moles of CO2 per 2 moles of isooctane.

The mass of CO2 is 1.15 billion tonnes

Explanation:

First we set the unbalanced equation:

$C_{8}H_{18} + O_{2} \longrightarrow CO_{2} + H_{2}O$

Now we proceed to balance the equation:

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

With the equation balanced, we see that the theoretical yield is 16 moles of CO2 per 2 moles of isooctane and we can proceed to make calculations with the following data:

$\rho _{C_{8}H_{18}}=0.69 g/mL\\Consumption: 142.86x10^{9} gal\\1gal=3785.41 mL\\M_{C_{8}H_{18}}=114.23g/mole\\M_{CO_{2}}=44.01g/mole\\$

Knowing the different relations between mass, density and molar mass, we have the following results:

$V_{C_{8}H_{18}}=5.41x10^{14}mL\\m_{C_{8}H_{18}}=3.73x10^{14}g\\n_{C_{8}H_{18}}=3.27x10^{12}mole\\n_{CO_{2}}=2.62x10^{13}mole\\m_{CO_{2}}=1.15x1015g\\m_{CO_{2}}=1.15x10^{9}tonnes$

8 0

4 years ago

Read the chemical equation. N2 + 3H2 → 2NH3 Using the volume ratio, determine how many liters of NH3 is produced if 1.2 liters o

zmey [24]

Answer : The volume of $NH_3$ produced will be, 0.8 liters.

Explanation : Given,

Volume of $H_2$ = 1.2 L

At STP, 1 mole of substance contains 22.4 L volume of substance.

The given balanced chemical reaction is:

$N_2+3H_2\rightarrow 2NH_3$

From the balanced chemical reaction we conclude that,

As, $3\times 22.4L$ volume of $H_2$ produced $2\times 22.4L$ volume of $NH_3$

So, $1.2L$ volume of $H_2$ produced $\frac{2\times 22.4L}{3\times 22.4L}\times 1.2L=0.8L$ volume of $NH_3$

Therefore, the volume of $NH_3$ produced will be, 0.8 liters.

5 0

3 years ago

Read 2 more answers

If the mass of a material is 118 grams and the volume of the material is 12 cm3, what would the density of the material be?

Sliva [168]

Density is equal to mass divided by volume.

So D=118/12

D=9.83

5 0

3 years ago

Na-23 has 12 neutrons. What is it’s atomic number?

quester [9]

Answer:

11

Explanation:

Data obtained from the question include:

Mass number = 23

Neutron = 12

Atomic number =.?

Next, we shall determine the number of protons present in the element.

This can be achieved by doing the following:

Mass number = Proton + Neutron

Mass number = 23

Neutron = 12

Proton =...?

Mass number = Proton + Neutron

23 = Proton + 12

Collect like terms

Proton = 23 – 12

Proton = 11

The atomic number of an element is equal to the proton number.

Atomic number = proton number

Proton number = 11

Atomic number = proton = 11

Therefore, the atomic number is 11.

5 0

3 years ago