10 gram of caco3 contains how many moles?
a) 1
b) 0.01 c) 0.1
d) 0.001

C, 0.1 mol.

Explanation:

According to the periodic table, the molar mass of Ca is 40.1, C is 12.0, O is 16.0,

so the molar mass of CaCO3 is 40.1 + 12.0 + 16.0 x 3 = 100.1

Using this formula:

no. of moles = mass / molar mass

No. of moles of CaCO3 = 10 / 100.1

= 0.1 mol (corrected to 1 d.p.)

Therefore, the answer is C, 0.1 mol.

b. accuracy of the data matters alot more than its number of digits, organization or amount of detail. quantitative observation is more accepted than the qualitative observation.