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Blababa [14]
3 years ago
7

What is the mass of 4.00 moles of helium

Chemistry
2 answers:
BlackZzzverrR [31]3 years ago
6 0

Answer:

The total mass of four moles of helium (He) is 16.0104 grams.

Explanation:

MrMuchimi3 years ago
4 0
The total mass of four moles of helium (He) is 16.0104 grams. Helium has an atomic mass of 4.0026 atomic mass units, which is the average mass of ...
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What relationship exists between an enzyme and a catalyst?
shepuryov [24]

A catalyst is a chemical that increases the rate of a chemical reaction without itself being changed by the reaction. The fact that they aren't changed by participating in a reaction distinguishes catalysts from substrates, which are the reactants on which catalysts work. Enzymes catalyze biochemical reactions.

5 0
2 years ago
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212 pb 82 is the isotope notation for iron. what is the atomic number, mass number, and number of both protons and neutrons?
o-na [289]

Hello!

The mass number in isotope notation is denoted A, the atomic number is denoted as Z, and the element is denoted as X.

In the given isotope, the mass of the isotope is 212 amu, and the atomic number is 82.

We know that the number of electrons, and protons are equal to the atomic number. Therefore, there are 82 protons. Also, to find the number of neutrons, we subtract the atomic number from the atomic mass.

212 - 82 = 130 neutrons

<u>Final answers</u>:  

  1. Atomic Number: 82
  2. Mass number: 212
  3. Number of Protons: 82
  4. Number of Neutrons: 130
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3 years ago
Which compounds represent the
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compounds in right hand side of the equation is called products.

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Explanation:

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2 years ago
Which mineral can be found in the rocks phyllite, sandstone, and granite?
Dominik [7]

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Describe the chemical calcium-oxide.
timama [110]

Answer:

Explanation:

Mallabone’s tests suggest there’s no risk the jacket liner will explode or heat up so much that it risks causing burns. The reaction also doesn’t produce acidic byproducts. And because calcium oxide doesn’t react with humidity (water vapor in the air), the liners can be stored for long periods and still work when needed.

Calcium oxide: A substance that gives off heat as it chemically reacts with water. Its chemical formula is CaO (which means each molecule is made up of one calcium atom and one oxygen atom).

Exothermic reaction: A chemical reaction that generates heat as it proceeds. (In Greek, “exo” means outside and “therm” means heat.)

Thought this might help ;)

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