CHEMISTRY HIGH SCHOOL

5 moles of H2O to grams

Answers

Answer 1
Answer: Mass = moles x molar mass
molar mass of H2O is 18
therefore mass = 18 x 5
=90 g
Answer 2
Answer: Mass = Molar mass × No. of moles
Molar mass of Water(H2O) = 1+1+16 = 18 gm
No. of moles = 5
Therefore, total mass = 18 × 5 = 90 gm

Related Questions

MIDDLE SCHOOL

What will happen to the balloon and cloth if they are brought close together without touching? Explain.

Answers

They will repeal(that is the correct answer to the question)
MIDDLE SCHOOL

How small do you think an individual atom is

Answers

Tiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiiny. atoms are smaller than anything else
Here is your answer:

Its so small that scientist need a special microscope just to see them.

Your answer is really tiny.
COLLEGE

A sample of solid naphthalene is introduced into an evacuated flask. Use the data below to calculate the equilibrium vapor pressure of naphthalene (C10H8) in the flask at 35°C. Hf (25C) Gf (25C) C10H8(s) 78.5 kJ/mol 201.6 kJ/mol C10H8(g) 150.6 kJ/mol 224.1 kJ/mol

Answers

Answer: The vapor pressure of naphthalene in the flask is atm.

Explanation:

For the conversion of naphthalene solid to naphthalene gas, the equilibrium reaction follows:

  • The equation used to calculate enthalpy change is of a reaction is:  

The equation for the enthalpy change of the above reaction is:

We are given:

Putting values in above equation, we get:

  • The equation used to calculate gibbs free change is of a reaction is:  

The equation for the enthalpy change of the above reaction is:

We are given:

Putting values in above equation, we get:

  • To calculate the (at 25°C) for given value of Gibbs free energy, we use the relation:

where,

= Gibbs free energy = 22.5 kJ/mol = 22500 J/mol  (Conversion factor: 1kJ = 1000J)

R = Gas constant =

T = temperature =

= equilibrium constant at 25°C = ?

Putting values in above equation, we get:

  • To calculate the equilibrium constant at 35°C, we use the equation given by Arrhenius, which is:

where,

= Equilibrium constant at 35°C = ?

= Equilibrium constant at 25°C =

= Enthalpy change of the reaction = 72.1 kJ/mol = 72100 J

R = Gas constant =

= Initial temperature =

= Final temperature =

Putting values in above equation, we get:

  • To calculate the partial pressure of naphthalene at 35°C, we use the expression of , which is:

Partial pressure of solid is taken as 1 at equilibrium.

So, the value of will be equal to

Hence, the partial pressure of naphthalene at 35°C is atm.

MIDDLE SCHOOL

What is an unsaturated solution?

Answers

An unsaturated solution is a chemical solution in which the solute concentration is lower than its equilibrium solubility.

MIDDLE SCHOOL

What is The atomic mass number of tin

Answers

Answer:

50

Explanation:

The atomic number is 50

Answer:

50

Explanation:

the atomic mass number of tin is 50

COLLEGE

Which term names elements that are usually shiny and good conductors of heat and electricity? A. gases B. metals C. solids D. nonmetals

Answers

Elements that are usually shining and good conductors of electricity are known as metals.

What are metallic elements?

They are elements that are metallic in nature. Metals are known for certain characteristics, which include:

  • They are good conductors of electricity
  • They shine when polished
  • They have high densities
  • They are malleable
  • They are good conductors of heat

More on the characteristics of metals can be found here: brainly.com/question/948126

#SPJ2

Which term names elements are usually shiny and good conductors of heat and electricity? 
MIDDLE SCHOOL

The speed of sound waves through two different media, steel and air, was recorded. According to the graph, sound waves travel

Answers

Answer:

This question is incomplete

Explanation:

Sound wave is a longitudinal wave that requires a medium to move through. This medium could be either solid, liquid or gas. However, sound waves travel faster in solids than in liquids or gases; this is because sound is a vibration and vibration moves faster in solid medium. The molecules in solids are closely linked and hence it's easier for vibration to be passed amongst them than in liquid or gas with molecules that are freely/distant apart.

From the explanation above, it is clear that the speed of sound will travel faster in steel (solid) than in air (gas).

Answer:

Faster through steel than through air, B.

brainliestt?

Explanation:

HIGH SCHOOL

What is the relationship between atoms, elements and compounds?

Answers

Different elements combine to make a compound. That means, hydrogen can combine with oxygen to create a compound called 'Water'. A compound is 'impure', that means it contains more than one type of atom. When a group of atoms combine, they create a molecule.
Hope it helped

MIDDLE SCHOOL

You are on a guided tour looking at stone statues from historical events. You observe that the newer statues are the same color, but seem to be much sharper and have more detail than the others. Which explanation best explains these differences?


A
Acid rain has dissolved the older statues over time.

B
Wind has slowly broken aways bits of the older statues.

C
Dirt and pollution has covered the features of the older statues.

D
Animals have probably scratched away at the older statues of time.

Answers

The best explanation would be that acid rain has dissolved the older statues over time.
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