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Answer :
Answer:
A: 0.436 moles MgCl2
B: 0.00452 moles Li2O
C: 23.3 moles Cr
D: 0.637 moles H2SO4
E: 0.547 moles C6H6
F: 3.97 moles H2O2
Explanation:
A: Calculate the number of moles of 41.5 grams of MgCl2
Molar mass of MgCl2 = 95.21 g/mol
Moles MgCl2 = 41.5 grams / 95.21 g/mol = 0.436 moles
B: Calculate the number of moles of 135 mg of Li2O
Molar mass of Li2O = 29.88 g/mol
Moles Li2O = 0.135 grams / 29.88 g/mol = 0.00452 moles
C: Calculate the number of moles of 1.21 kg of Cr
Molar mass of Cr = 52.0 g/mol
Moles Cr = 1210 grams / 52.0 g/mol = 23.3 moles
D: Calculate the number of moles of 62.5 grams of H2SO4
Molar mass of H2SO4 = 98.08 g/mol
Moles H2SO4 = 62.5 grams / 98.08 g/mol = 0.637 moles
E: Calculate the number of moles of 42.7 grams of C6H6
Molar mass of C6H6 = 78.11 g/mol
Moles C6H6 = 42.7 grams / 78.11 g/mol = 0.547 moles
F: Calculate the number of moles of 135 grams of H2O2
Molar mass of H2O2 = 34.01 g/mol
Moles H2O2 = 135 grams / 34.01 g/mol = 3.97 moles
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Final answer:
The number of moles for a substance is calculated by dividing its mass by its molar mass. Examples include calculating moles for MgCl2 and Li2O by using their molar masses of 95.21 g/mol and 29.88 g/mol, respectively, and dividing the given masses of the substances by these molar masses.
Explanation:
To calculate the number of moles of a substance, you need the mass of the substance and the molar mass of the substance (the mass of one mole of that substance, typically in grams/mol).
The number of moles (n) is calculated by dividing the mass of the substance (m) by its molar mass (M): n = m / M. Here's how you can calculate the moles for each sample:
- a. Magnesium chloride (MgCl2): First, find the molar mass of MgCl2 by adding the molar masses of Mg (24.31 g/mol) and two Cl atoms (2 x 35.45 g/mol), which equals 95.21 g/mol. Then, divide 41.5 g by 95.21 g/mol to get the moles of MgCl2.
- b. Lithium oxide (Li2O): The molar mass of Li2O is the sum of the molar masses of 2 Li atoms (2 x 6.94 g/mol) and one O atom (16.00 g/mol), which equals 29.88 g/mol. Divide 135 mg (0.135 g) by 29.88 g/mol to find the moles of Li2O.
- Through similar calculations, you can determine the number of moles for each of the other substances given their respective masses and molar masses.
