Question

calculate the number of moles in massas 7.9mg of ca​

Answer 1

Answer:

Given mass = 7.9 mg = 7.9 × 10^-3 g = 0.0079 g

Molar mass of Ca = 40 g

No. of moles = given mass / molar mass = 0.0079/ 40 = 0.0001975 moles.

Answer 2

Answer:

n=0.1975×10-3  OR  0.0001975

Explanation:

hey! at first we have to convert given mass of ca into grams and then put it in formula as we know no.of moles is equal to mass in grams divided by molar mass...

here is ur ans..thanks

hope it will help u!