how many C2H4 molecules are contained in 45.8 mg C2H4 when the molar mass of C2H4 is 28.05g/mol
moles=45.8/28.05
molecules= moles*avagradros number.
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To determine the number of C2H4 molecules in 45.8 mg, you need to follow these steps:
Step 1: Calculate the number of moles of C2H4 in 45.8 mg.
To find the number of moles, divide the mass (in grams) by the molar mass (in grams/mole).
Number of moles = Mass / Molar mass
Number of moles = 45.8 mg / (28.05 g/mol × 1000 mg/g)
Number of moles = 0.00163 moles
Step 2: Use Avogadro's number to convert moles to molecules.
Avogadro's number is approximately 6.022 × 10^23 molecules/mole.
Number of molecules = Number of moles × Avogadro's number
Number of molecules = 0.00163 moles × (6.022 × 10^23 molecules/mole)
Number of molecules = 9.807 × 10^20 C2H4 molecules
Therefore, there are approximately 9.807 × 10^20 C2H4 molecules in 45.8 mg of C2H4.
To determine the number of C2H4 molecules in 45.8 mg of C2H4, we can use the following steps:
Step 1: Find the number of moles of C2H4 using its molar mass.
Molar mass of C2H4 = 28.05 g/mol
Number of moles = Mass / Molar mass
Number of moles = 45.8 mg / (28.05 g/mol)
Note: The units of mass must be consistent, so we convert 45.8 mg to grams.
1 gram (g) = 1000 milligrams (mg)
45.8 mg = 45.8 mg * (1 g / 1000 mg) = 0.0458 g
Number of moles = 0.0458 g / 28.05 g/mol
Step 2: Determine the number of molecules using Avogadro's number.
Avogadro's number is approximately 6.022 x 10^23 molecules/mol.
Number of molecules = Number of moles * Avogadro's number
Number of molecules = 0.0458 mol * 6.022 x 10^23 molecules/mol
Therefore, there are approximately 2.76 x 10^22 molecules of C2H4 in 45.8 mg of C2H4.