CHEMISTRY HIGH SCHOOL

How many grams of sodium oxide can be produced when 55.3 g Na react with 64.3 g O2? Unbalanced equation: Na + O2 → Na2O

Show, or explain, all of your work along with the final answer.

Answers

Answer 1
Answer:

Answer : The amount of sodium oxide produced is, 74.40 grams

Solution : Given,

Mass of sodium = 55.3 g

Mass of O_2= 64.3 g

Molar mass of sodium = 23 g/mole

Molar mass of O_2 = 32 g/mole

Molar  mass of Na_2O = 61.9 g/mole

First we have to calculate the moles of sodium and oxygen.

Moles of Na = \frac{\text{ given mass of Na}}{\text{ molar mass of Na}}= (55.3g)/(23g/mole)=2.404moles

Moles of O_2 = \frac{\text{ given mass of }O_2}{\text{ molar mass of }O_2}= (64.3g)/(32g/mole)=2.009moles

Now we have to calculate the limiting and excess reagent.

The balanced chemical reaction will be,

4Na+O_2\rightarrow 2Na_2O

From the balanced reaction we conclude that

4 moles of sodium react with 1 mole of oxygen

2.404 moles of sodium react with (2.404)/(4)=0.601 moles of oxygen

Excess moles of oxygen = 2.009 - 0.601 = 1.408 moles

That means sodium is a limiting reagent and oxygen is an excess reagent.

Now we have to calculate the moles of sodium oxide.

From the reaction we conclude that,

4 moles of sodium react to give 2 moles of sodium oxide

2.404 moles of sodium react to give (2)/(4)* 2.404=1.202 moles of sodium oxide

Now we have to calculate the mass of sodium oxide.

\text{Mass of }Na_2O=\text{Moles of }Na_2O* \text{Molar mass of }Na_2O

\text{Mass of }Na_2O=(1.202moles)* (61.9g/mole)=74.40g

Therefore, the amount of sodium oxide produced is, 74.40 grams
Answer 2
Answer: Given the two amounts of reactants, we get the limiting reactant between the two. We convert each to mole and divide them to their corresponding stoichiometric coefficient. we balance first above, that is 4Na+O2=2Na2O. hence, for Na that is 0.60 mole and oxygen is 2.00 mole. We follow the smaller amount, Na, hence the amount of sodium oxide in grams is 74.53 grams. 

Related Questions

Light of a certain energy shines on a metal and causes electrons to be emitted. Based on the research of Albert Einstein, what change would most likely result in stopping the emission of electrons from this metal?
What is the mass of 2.50 ×1022 molecules of NaOH (Molar mass = 40.0 g/mol)?
HELP!!!!!! Multiple choiceDuring transmutation...A. the number of neutrons always decreases.B. the number of neutrons always increases.C. the number of protons always increases.D. the number of protons always decreases.
True or False a gas that ignites a glowing splint is oxygen
Uses a special type of paper to separate liquids based on their different densitiesa. filtrationb. distillationc. crystallizationd. chromatography

A chemist wants to calculate the amount of heat that is absorbed by a sample of copper as it is melted. Which constant should she use?

Answers

She needs to use the heat of fusion (ΔH(fusion)) and the equation q=mΔH(fusion) or q=nΔH(fusion)  depending on whether or not ΔH(fusion) is given in J/g or J/mol.  The reason why temperature is absent from the equation is that temperature does not change at a phase change, only the enthalpy does.

I hope his helps.  Let me know in the comments if anything is unclear.

Answer:

Hfus

Explanation:

This is correct on edge.

Discuss the shapes of Nh3 and H2O on the basis of VESPER theory?​

Answers

Answer:

Ammonia has 4 regions of electron density around the central nitrogen atom (3 bonds and one lone pair). These are arranged in a tetrahedral shape. The resulting molecular shape is trigonal pyramidal with H-N-H angles of 106.7°.

Explanation:

Describe the motions of particles in three common states of matter

Answers

gas- less particles move fast and freely, not contained
liquid- particles move a bit slower, more particles
solid- particles barely move, many particles in a confined space

Suppose that a substance in a beaker is heated over a burner in a science lab. Which observation would most likely indicate that a chemical change has occurred in the substance?1) If the substance is a liquid or solid, an increase in temperature would indicate a chemical change.

2) If the substance is a liquid, a change of some of the liquid to gaseous form would indicate a chemical change.

3) If the substance is a solid, a change of some of the solid to liquid form would indicate a chemical change.

4) If the substance is a liquid or solid, the production of an odor would indicate a chemical change.

Answers

Answer:

4

Explanation:

took the test on edge

In an energy diagram, the reactants are at a higher potential energy compared to the products. Which of the following best describes this reaction?A)

It is endothermic and will have a positive enthalpy.

B)

It is endothermic and will have a negative enthalpy

C)

It is exothermic and will have a positive enthalpy.

D)

It is exothermic and will have a negative enthalpy.

Answers

Answer is (D) - It is exothermic and will have a negative enthalpy.


If the reactants are at a higher potential energy compared to the products, it means reactants have more energy than the products. That energy is released to the environment as heat. Due to the releasing of heat to the surrounding, the reaction is exothermic. Since the reaction is exothermic; the enthalpy of the reaction will be negative value.

What is the theoretical yield of H2O if 130 g of H2O is produced from 18 g of H2 and an excess of O2?

Answers

The theoretical yield of H2O if 130g of H2O is produced from 18g of H2 and an excess of O2 is 160g. 

Answer: The theoretical yield of water is 162 grams.

Explanation:

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 hydrogen gas = 18 g

Molar mass of hydrogen gas = 2 g/mol

Putting values in equation 1, we get:

\text{Moles of hydrogen gas}=(18g)/(2g/mol)=9mol

The chemical equation for the formation of water from hydrogen gas and oxygen gas follows:

2H_2+O_2\rightarrow 2H_2O

As, oxygen gas is present in excess. It is considered as an excess reagent.

So, hydrogen gas is considered as a limiting reagent because it limits the formation of product.

By Stoichiometry of the reaction:

2 moles of hydrogen gas produces 2 moles of water

So, 9 moles of hydrogen gas will produce = (2)/(2)* 9=9mol of water

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

Molar mass of water = 18 g/mol

Moles of water = 9 moles

Putting values in equation 1, we get:

9mol=\frac{\text{Mass of water}}{18g/mol}\n\n\text{Mass of water}=162g

Hence, the theoretical yield of water is 162 grams.
Other Questions
In a biochemical reaction, an enzyme acts as a catalyst, causing the(1) activation energy of the reaction to decrease (2) potential energy of the reactants to decrease (3) kinetic energy of the reactants to increase (4) heat of reaction to increase
Is coffee a solution, colloid, or suspension?
Which statement is true about a proton and an electron?(1) They have the same masses and the same charges.(2) They have the same masses and different charges.(3) They have different masses and the same charges.(4) They have different masses and different charges.
Maggie is solving a chemistry riddle her clue is to take the number of valence electrons in halogens and subtract it by the number of valence electrons in alkali metals. what is the answer to the riddle maggie is solving?