Respuesta :
Answer:
Chemistry with Mr.B? me too!
a) 0/17moles
b)1.02x10^23
c) 1.12 x 10^25
Is this correct
Explanation:
Use:
n = m/M
N= n x NA
calculate atoms in C3H8 = 11
The number of moles, molecules and atoms of propane present in 7.35g of sample is 0.166mol, 9.9×10²² molecules & 1.089 × 10²⁰ respectively.
How do we calculate moles?
Moles will be calculated by using the below formula as:
n = W/M, where
W = given mass
M = molar mass
- Moles of propane in sample will be:
n = 7.35g / 44.1g/mol = 0.166mol
- In 1 moles of any substance 6.022×10²³ entities of that substance are present.
In 0.166 mol = (0.166mol)(6.022×10²³ molecules/mol) = 9.9×10²² molecules of propane are present.
- Total atoms in propane (C₃H₈) are 11, so total number of atoms in the given sample is:
No. of atoms = (11)(9.9×10²²) = 1.089 × 10²⁰
Hence 0.166 mole of propane is present in 7.35 grams of sample.
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