Asked by PaulinaScience 🔬

How do you find out a mole?

Profile picture

VERIFIED

Verified tutor tick

Nathan Rawle

Oxford Master of Biochemistry - boss of Biology, Chemistry, Physics, and Maths

Find the atomic or molecular mass of a solid ⛰ or liquid ☔️ and stick a “g” for grams after it. There is one mole of that substance in that many grams of it. To find the number of moles in any mass of the substance, calculate: [mass (in grams)] / [relative atomic or molecular mass] For a gas 💨, there is one mole of that gas in 24 litres of it (or 24 dm^3) at room temperature and pressure (20°C and 1 atm). To find the number of moles in any volume of a gas (at rtp), calculate: [given volume (in dm^3)] / 24 Eg1: Lithium has an atomic weight of 6.941. Therefore, 6.941 grams of lithium contain 1 mole of lithium. Eg2: Sodium chloride has a molecular mass of 58.44. Therefore, 58.44 grams of sodium chloride contain 1 mole of sodium chloride. Eg3: Hydrogen is a gas at rtp. Therefore, at room temperature and pressure, 24 dm^3 of hydrogen gas contain 1 mole of hydrogen. Eg4: water has a molecular weight of 18.015. A litre of water weighs 1kg. 1kg = 1000g. 1000 / 18.015 = 55.509. There are 55.509 moles of water in 1 litre. Eg5: Oxygen is a gas at rtp. 6 dm^3 oxygen gas contains 6/24 = 0.25 moles of oxygen. If you’d like more chemistry tuition, please contact me through my profile 👨‍🔬! ⚛️

Nathan also answered

Asked in Science 🔬

ASKED BY JENIFFER

SCIENCE 🔬

Can you explain the processes of condensation, evaporation, and precipitation in the water cycle?

There is an abundance of water on Earth as it is already. Let’s start off with evaporation. The water that’s on the surface of the earth is turned f...

ASKED BY LIAM

SCIENCE 🔬

What are the stages of the death of a star? Are they different for different types of stars?

For all stars, It starts off with: Nebula > Protostar > Main sequence star (e.g Sun) Then comes the ‘dying’ stages: Small stars- main sequence star ...

ASKED BY LILA

SCIENCE 🔬

Why do we like sugar so much?

There are a number of strands you could consider when you answer this question, and so narrowing down what you want to focus on will help you to pla...

ASKED BY KATHRYN

SCIENCE 🔬

What does biodiversity mean?

Biodiversity can very simply be defined as the variety of living life - both plant and animal - in the world or a specific habitat. It often is a co...

ASKED BY JESSICA

SCIENCE 🔬

What is the difference between a disease and infection ?

The primary difference is that infection refers to the process of introducing a malicious foreign body into another, such as a virus into a human, w...

ASKED BY LIAM

SCIENCE 🔬

What is the most powerful type of thunderstorm?

Supercells are the most powerful types of thunderstorms. They produce very severe weather including high speed winds of 100mph or 162km/hr, large ha...

ASKED BY AUDREY

SCIENCE 🔬

In which type of rock would you be most likely to find layers?

You would be most likely to find layers in sedimentary rocks. This is because the rock is formed when silt, sand and other materials in rivers are p...

ASKED BY SHAHD

SCIENCE 🔬

Why does potential energy mean?

Potential energy is the energy stored in a body due to its position or deformation. It is called “potential” energy simply because it has the potent...

ASKED BY AYA

SCIENCE 🔬

How can you memorize different topics ?such as science b1 b2 b3 as well as the extra 6 topics to memorize all of physics and chemistry and how long should I do it for I'd I start from the first day as a yr 11 student 😯😯😯😯?

Start off small. If you try to suddenly learn all the content and do loads of revision you will quickly lose motivation. If you start off just doing...

ASKED BY AI

SCIENCE 🔬

To which extent can renewable energy replace fossil fuels?

That is a question that should be answered with another question, to which extent we want to save or at least reduce the dramatic impact that fossil...

Find me a tutor

We take your privacy seriously. View our policy.