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30 December, 11:17

Suppose you have 81.8 g of Cd. How many Cd atoms are present? Report your answer in scientific notation using the format of 6.022E23 for 6.022 x 1023.

Suppose you have 39.1 g of Ti. What number of moles of Ti is present?

Salicylic acid has the formula C7H6O3. What is the molar mass of salicylic acid?

Sildenafil, sold as the brand name Viagra among others, has a molar mass of 474.5828. Suppose you have 0.118 g of sildenafil. How many moles of sildenafil are present? Report your answer to 3 significant figures. If you choose to use scientific notation in reporting your answer, use the format of 6.022E23 for 6.022 * 1023

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Answers (1)
  1. 30 December, 11:33
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    1. number of Cd atoms = 4.384 * 10²³

    2. number of moles of Ti = 0.817 mol

    3. molar mass of C₇H₆O₃ = 138.077 g/mol

    4. moles of Sildenafil = 0.249 mmol

    Explanation:

    1. given data

    mass of Cd = 81.8 g

    number of Cd atoms = ?

    molar mass of Cd = 112.411 g/mol

    Solution

    1st we find out the number of moles of Cd

    number of moles = mass / molar mass

    number of moles of Cd = 81.8 g / 112.411 g. mol⁻

    number of moles of Cd = 0.728 mol

    Now we find out the number of Cd atoms

    number of atoms = moles * 6.022 * 10²³

    number of Cd atoms = 0.728 (6.022 * 10²³)

    number of Cd atoms = 4.384 * 10²³

    2. Given data

    Mass of Ti = 39.1 g

    moles = ?

    molar mass Ti = 47.867 g/mol

    Solution

    Now we will find out the number of moles

    number of moles = mass / molar mass

    number of moles of Ti = 39.1 g / 47.867 g. mol⁻

    number of moles of Ti = 0.817 mol

    3. Given data

    chemical formula of Salicylic acid = C₇H₆O₃

    molar mass of salicylic acid = ?

    molar mass of carbon = 12.011

    molar mass of hydrogen = 1.008

    molar mass of oxygen = 15.999

    molar mass of molecule = number of moles of atoms * molar mass of atoms

    molar mass of C₇H₆O₃ = 7 (12.011) + 6 (1) + 3 (16)

    molar mass of C₇H₆O₃ = 84.077 g + 6 g + 48 g

    molar mass of C₇H₆O₃ = 138.077 g/mol

    4. Given data

    molar mass of Sildenafil = 474.5828 g/mol

    mass given = 0.118 g

    moles of Sildenafil = ?

    Solution

    Now we find out the number of moles

    number of moles = mass / molar mass

    number of moles Sildenafil = 0.118 g / 474.5828 g/mol

    number of moles Sildenafil = 0.0003 mol

    as this is very small amount we convert it into millimoles

    millimoles = moles * 1000

    millimoles of Sildenafil = 0.000249 * 1000

    millimoles of Sildenafil = 0.249 mmol
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