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3 years ago

Write 2,700,000 in scientific notation

Chemistry

2 answers:

Aleonysh [2.5K]3 years ago

6 0

The answer to the question is B

aliina [53]3 years ago

6 0

Answer:

its b check it and that's it u know

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Part B When carbon is burned in air, it reacts with oxygen to form carbon dioxide. When 22.8 g of carbon were burned in the pres

aksik [14]

Answer: The amount of carbon dioxide gas produced in the reaction is 83.6 grams

Explanation:

As, some amount of oxygen gas is left after the reaction is completed. So, it is present in excess and is considered as an excess reagent.

Thus, carbon is considered as a limiting reagent because it limits the formation of product.

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$ .....(1)

Given mass of carbon = 22.8 g

Molar mass of carbon = 12 g/mol

Putting values in equation 1, we get:

$\text{Moles of carbon}=\frac{22.8g}{12g/mol}=1.9mol$

The chemical equation for the reaction of carbon and oxygen gas follows:

$C+O_2\rightarrow CO_2$

By Stoichiometry of the reaction:

1 mole of carbon produces 1 mole of carbon dioxide gas

So, 1.9 moles of carbon will produce = $\frac{1}{1}\times 1.9=1.9moles$ of carbon dioxide gas

Now, calculating the mass of carbon dioxide from equation 1, we get:

Molar mass of carbon dioxide = 44 g/mol

Moles of carbon dioxide = 1.9 moles

Putting values in equation 1, we get:

$1.9mol=\frac{\text{Mass of carbon dioxide}}{44g/mol}\\\\\text{Mass of carbon dioxide}=(1.9mol\times 44g/mol)=83.6g$

Hence, the amount of carbon dioxide gas produced in the reaction is 83.6 grams

6 0

3 years ago

A 1.2 L weather balloon on the ground has a temperature of 25°C and is at atmospheric pressure (1.0 atm). When it rises to an el

natita [175]

Answer: 44.37 degrees C

Explanation:

Use combined gas law: (P1)(V1)/T1=(P2)(V2)/T2

For most gas laws, you must convert to Kelvin:

K=deg C+273

K=25+273=298 K

Plug and chug:

(1.0 atm)(1.2 L)/(298 K)=(0.71 atm)(1.8 L)/(x)

Solve for x and get 317.37 K

Subtract 273 from this to convert to degrees Celsius. You will get 44.37 degrees Celsius.

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8 0

3 years ago

A block of aluminum occupies a volume of 15ml and weighs 40.5 g, what it its density?

san4es73 [151]

<h2>Answer:3 $gmL^{-1}$ </h2>

Explanation:

Let $v$ be the volume of the given material.

Let $m$ be the mass of the material.

Let $d$ be the density of the material.

Density of a material is defined as the ratio of its mass to its volume.

$d=\frac{m}{v}$

Given,

$m=45g\\v=15ml$

So, $d=\frac{45}{15}=3gmL^{-1}$

5 0

3 years ago

How many grams of ethylene (C2H4) are needed to produce 140 grams of carbor dioxide?

Leto [7]

Answer:5

Explanation:

just trust me 5

4 0

3 years ago

The reaction 2 no(g) + cl2(g) → 2 nocl(g) is carried out in a closed vessel. if the partial pressure of no is decreasing at a ra

BARSIC [14]

Answer:

92.0 torr/min.

Explanation:

For the reaction: 2NO(g) + Cl₂(g) → 2NOCl(g).

∵ The rate of the reaction = - 1/2(ΔP)NO/Δt = - (ΔP)Cl₂/Δt = 1/2(ΔP)NOCl/Δt.

∵ (ΔP)NO/Δt = - 184 torr/min.

∴ The rate of change of the total pressure in the vessel = - 1/2(ΔP)NO/Δt = (- 1/2)(- 184 torr/min) = 92.0 torr/min.

4 0

4 years ago