Question

write 2's complement of -87​

Answer 1

Explanation:

Molar mass of = 1(S) + 2(O) = 1 (32) + 2 (16) = 32+32 = 64g. 1 mole of substance = Molar mass of the substance. Conclusion: 0.75 moles of have same mass as 3 moles of oxygen.