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2 years ago

5. Given the reaction:

Chemistry

1 answer:

Alja [10]2 years ago

6 0

Answer:

48 g of oxygen is needed to produced 54 g of water.

Explanation:

Given data:

Mass of O₂ = ?

Mass of H₂O = 54 g

Chemical equation:

O₂ + 2H₂ → 2 H₂O

Number of moles of H₂O:

Number of moles of H₂O= Mass /molar mass

Number of moles of H₂O= 54 g / 18/mol

Number of moles of H₂O= 3 mol

Now we will compare the moles of water with oxygen .

H₂O : O₂

2 : 1

3 : 1/2 × 3 =1.5

The 3 moles of H₂O produced by 1.5 moles of oxygen.

Mass of O₂ :

Mass of O₂ : = number of moles × molar mass

Mass of O₂ : = 1.5 mol ×32 g/mol

Mass of O₂ : = 48 g

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Daniel [21]

Answer:

C. They have the same number of protons.

Explanation:

Even though in isotopes, there's uneven number of neutrons, there's always same number of protons.

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The empirical formula of a molecule is C2H6. In an experiment, the Molar mass of the molecule was determined to be 90.21g/mol. U

Firlakuza [10]

Answer:

C₆H₁₈

Explanation:

Let's say x is the subscript of carbon and y is the subscript of hydrogen. We know from the empirical formula that the ratio of x to y is 2 to 6.

x / y = 2 / 6

We also know from the molar mass that:

12.01x + 1.01y = 90.21

Solving the system of equations:

2y = 6x

y = 3x

12.01x + 1.01(3x) = 90.21

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2 years ago

Pluto is a planet<br><br> True<br> False

koban [17]

Answer:

False

Explanation:

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Assuming all other conditions remain the same, which of the following will cause an object's density to increase?

Elanso [62]

Taking into account the definition of density, assuming all other conditions remain the same, increasing mass will cause an object's density to increase.

Density is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space. That is, density is a quantity referred to the amount of mass contained in a given volume.

Density is an intensive property since it does not vary with the amount of substance.

Since density is the relationship between the mass and the volume of a substance, its calculation is defined as the quotient between the mass of a body and the volume it occupies:

$density=\frac{mass}{volume}$

In the previous expression it can be observed that the density is inversely proportional to the volume: the smaller the volume occupied by a certain mass, the greater the density.

On the other hand, density is directly proportional to mass: the greater the mass, the greater the density.

Finally, assuming all other conditions remain the same, increasing mass will cause an object's density to increase.

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2 years ago