Chemistry Problem Solver

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Chemistry Problem Solver Templates & Examples

  • INPUT

    Calculate the molar mass of H2O

    OUTPUT

    The molar mass of a substance is defined as the mass of one mole of that substance. It is expressed in grams per mole (g/mol). To calculate the molar mass of H2O, we need to know the atomic mass of each element in the molecule.

    The atomic mass of hydrogen (H) is 1.008 g/mol and the atomic mass of oxygen (O) is 15.999 g/mol. Therefore, the molar mass of H2O can be calculated as follows:

    Molar mass of H2O = (2 x atomic mass of hydrogen) + (1 x atomic mass of oxygen)
    = (2 x 1.008 g/mol) + (1 x 15.999 g/mol)
    = 2.016 g/mol + 15.999 g/mol
    = 18.015 g/mol

    Therefore, the molar mass of H2O is 18.015 g/mol.

    Explanation:

    Molar mass is a measurement of the mass of a substance in grams per mole. It is a useful unit when working with chemical reactions and equations because it allows us to easily measure and calculate the amount of substance present.

    In this problem, we are given the chemical formula for water, which is H2O. This means that each molecule of water contains 2 atoms of hydrogen (H) and 1 atom of oxygen (O). To calculate the molar mass of H2O, we need to know the atomic mass of each element.

    The atomic mass of an element is the mass of one atom of that element relative to the mass of one atom of carbon-12. It is measured in atomic mass units (amu). The periodic table displays the atomic mass of each element, and we can use this information to calculate the molar mass of a compound.

    In our case, we have two atoms of hydrogen, each with an atomic mass of 1.008 amu, and one atom of oxygen with an atomic mass of 15.999 amu. So, to find the molar mass of H2O, we simply add the atomic masses of each element, taking into account the number of atoms present in the compound.

    This calculation can be represented as:

    Molar mass of H2O = (2 x atomic mass of hydrogen) + (1 x atomic mass of oxygen)
    = (2 x 1.008 amu) + (1 x 15.999 amu)
    = 2.016 amu + 15.999 amu
    = 18.015 amu

    To convert the value into grams per mole, we simply multiply by the conversion factor of 1 g/mol = 1 amu. This gives us a molar mass of 18.015 g/mol.

    In conclusion, the molar mass of H2O is 18.015 g/mol. This value is important in various applications, such as determining the amount of water produced in a chemical reaction or calculating the amount of a substance needed for a specific reaction.

  • INPUT

    Calculate the molar mass of H2O

    OUTPUT

    To calculate the molar mass of H2O (water), we need to sum the molar masses of each element in the compound based on its chemical formula.

    The chemical formula for water is H2O, which means it contains 2 hydrogen atoms (H) and 1 oxygen atom (O).

    Step 1: Find the atomic masses of hydrogen and oxygen

    The atomic masses can be found on the periodic table:

    • The atomic mass of hydrogen (H) is approximately 1.01 g/mol.

    • The atomic mass of oxygen (O) is approximately 16.00 g/mol.

    Step 2: Calculate the molar mass of H2O

    Since there are 2 hydrogen atoms and 1 oxygen atom in water, the molar mass of H2O can be calculated as follows:

    [ \text{Molar mass of H2O} = (2 \times \text{Atomic mass of H}) + (1 \times \text{Atomic mass of O}) ]

    [ \text{Molar mass of H2O} = (2 \times 1.01 , \text{g/mol}) + (1 \times 16.00 , \text{g/mol}) ]

    [ \text{Molar mass of H2O} = 2.02 , \text{g/mol} + 16.00 , \text{g/mol} ]

    [ \text{Molar mass of H2O} = 18.02 , \text{g/mol} ]

    Conclusion

    The molar mass of H2O (water) is 18.02 g/mol. This value is essential for various calculations in chemistry, such as determining the number of moles in a given mass of water or the mass of water in a given number of moles.

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