Q:

How many atoms of hydrogen are there in 18 grams of water?

A:

Quick Answer

There are 1.204 x 10^24 atoms of hydrogen present in 18 grams of water. In order to calculate this, it is necessary to compute the number of hydrogen moles present in the sample.

Continue Reading

Full Answer

A molecule of water consists of a single atom of oxygen and two atoms of hydrogen. Oxygen has an atomic weight of 15.9994. One mole of oxygen, therefore, has a mass of just under 16 grams. Hydrogen has an atomic weight of 1.0079, and so a mole of hydrogen weighs just over 1 gram. This means that 18 grams of water contains one 16-gram mole of oxygen and two 1-gram moles of hydrogen. The number of particles in a mole is a constant known as Avogadro's number, which has a value of 6.022 x 10^23. Two moles of hydrogen, therefore, is double Avogadro's number.

Learn more about Atoms & Molecules

Related Questions

  • Q:

    How many different elements are in a water molecule?

    A:

    Water contains two types of elements, hydrogen and oxygen, and three atoms in total. Because hydrogen is the most abundant element in the universe and oxygen is also common, water is thought to be a common chemical throughout the universe.

    Full Answer >
    Filed Under:
  • Q:

    What is a hydrated compound?

    A:

    Hydrated compounds are any compounds that have chemically attached water molecules or hydrogen and oxygen atoms. These compounds can dissociate into water and other compounds. Hydrated compounds may be either organic, containing carbon atoms, or inorganic.

    Full Answer >
    Filed Under:
  • Q:

    What is the difference between ribose and deoxyribose?

    A:

    The difference between ribose and deoxyribose is that in ribose, the second carbon atom carries a combination of hydrogen and oxygen atoms known as a hydroyxl group. In deoxyribose, on the other hand, the second carbon atom carries only a hydrogen atom. Ribose and deoxyribose, along with a phosphate atom and a nucleobase, are the building blocks of nucleotides. They make up the backbone chains of RNA and DNA, respectively.

    Full Answer >
    Filed Under:
  • Q:

    What is the difference between NH3 and NH4?

    A:

    The compound NH3 contains one atom of nitrogen and three atoms of hydrogen, whereas NH4 contains one atom of nitrogen and four atoms of hydrogen. NH3 is the chemical formula for ammonia, and NH4 is the chemical formula for ammonium.

    Full Answer >
    Filed Under:

Explore