3 March, 10:29

# 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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1. 3 March, 13:04
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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