Question

1 / 2
CO2= 12 + 16x2 =44u
Molar mass = 44g
44g is 1mole
So 1g is 1/44 moles
So 88 g is (1/44)x88 moles =2 moles
So for 54 g of water ????????
Water molar mass is 1x2 + 16 =18g
Given mass =54g
So 18 g=1mole
Now 1g =1/18 moles
Hence 54g = (1/18)x54 moles =54/18 =3 moles
For 64 g of methane (CH4)
CH4= 12 + 1x4 =16u
Molar mass of methane =16g
16 g of methane = 1mole
So 1g of methane = 1/16 moles
Hence 64g of methane =(1/16)x64 moles =64/16 = 4 moles
Number of moles = Given mass /molar mass
Q1. Find the number of moles in 6 g of carbon. (C=12u)
2 / 2
Q2. How many grams of oxygen will make 2 moles of oxygen gas?(O=16u)
O2=32g
No of moles =Given masss/ molar mass
2 = x/32
X=2x32=64g
Q3. What is a mole? What is the unit of mole? How many molecules are there in 1 mole of a substance?
Q4. Calculate te molar mass of the following substances:
i. Ethyne, C2H2
ii. Sulphur molecules, S8
Q5.What is the mass of :
i. 0.2 mole of oxygen atoms.
ii. 4 mol of Al atoms (Al =27u)
Q6. Find the number of moles in:
i. 12g of oxygen gas
ii. 22g of Carbon dioxide.

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Answer 1

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Step-by-step explanation:

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