All categories

3 years ago

5. Given the reaction:

Chemistry

1 answer:

Alja [10]3 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

You might be interested in

A lab technician needs a 40% solution of a certain chemical for an experiment, but the lab that she works in only has a 20% solu

Snezhnost [94]

To determine the volume of both concentration of the solution to make another concentration of solution, we need to set up two equations since we have two unknowns. 

For the first equation, we do a mass balance:

mass of 50% solution + mass of 20% solution = mass of 40% solution
M1 + M2 = M3

For the second equation, we do a component balance,

M1(50%) + M2(20%) = M3(40%)
.50M1 + .20M2 = .40M3

To determine the ratio, we assume we have to make a 100 g of the 40% solution. So, the equation would change to

M1 + M2 = 100

.50M1 + .20M2 = (100)(.40) = 40

Solving for M1 and M2,

M1 = 66.67 g

M2 = 33.33 g

So, the ratio of the 20% and the 50% would be approximately 33.33/66.67 = 0.5.

8 0

3 years ago

What type of compound can be described by the following image?

uranmaximum [27]

Answer:

Covalent molecule

Explanation:

i just had got the answer right

5 0

2 years ago

From the diagram, when the temperatures of reactants are raised from 20°C to 30°C:

sveta [45]

Answer: D. The number of molecules having Er or greater doubles.

Explanation: As the temperature increases from 20°C to 30°C, the number of molecules with maximum energy decreases, but the number of effective collisions which result into the formation of product doubles.

This is due to doubling of molecules which possess energy equal to or greater than $E_r$ which means now double number of molecules will be able to cross the energy barrier and hence the formation of product increases and hence the rate increases to double.

5 0

4 years ago

Read 2 more answers

The Solubility Product Constant for calcium bromide is > 1. If calcium bromide is dissolved in water you can say that the equ

DiKsa [7]

Answer: (1). If calcium bromide is dissolved in water you can say that the equilibrium concentrations of calcium and bromide ions are high.

(2). The solubility of calcium bromide in water is high.

Explanation:

We know that for a reaction its solubility product is equal to the product of concentration of ions present.

For example, $CaBr_{2} \rightarrow Ca^{2+} + 2Br^{-}$

$K_{sp} = [Ca^{2+}][Br^{-}]^{2}$

As it is given that for this reaction $K_{sp}$ > 1. Hence, the product of concentration of both these ions will be greater than 1 which means that products are favored.

Therefore, equilibrium concentrations of calcium and bromide ions are high.

Also, more is the number of these ions formed more will be the solubility of the compound ( $CaBr_{2}$ ).

As a result, the solubility of calcium bromide in water is high.

7 0

4 years ago

Ten of the sixteen nonmetals are _____ at room temperature.

anyanavicka [17]

It is A) solids........

5 0

3 years ago

Read 2 more answers