How many moles are there in 15.0 grams of SiO2?
a
0.170 mol
b 0.340 mol
c 0.534 mol
d 0.250 mol
e 0.208 mol
Check it

Option C (0.534 mol)

Explanation:

To find number of moles:

Moles = given mass ÷ mass of 1 mole

=> moles of SiO2 = 15 ÷ 28

= 0.534

Note: 28 is the molar mass of SiO2 and 1 mole equals to its molar mass that's why 1 mole of SiO2 is 28

state the principle of separating two immiscible liquids by separating funnel. describe an activity with diagram to separate a mixture of water and kerosene oil. answer: immiscible layers separate out in layers depending on their densities in separating funne