1. Considera a molécula de carbonato de cálcio (CaCO3). Ar(Ca)=40; Ar(C)=12; Ar(0) = 16; Ar(Cl) = 35; Ar(H) = 1 ; Ar(S) = 32
a) Calcula a sua massa molecular relativa.
b) Qual é a sua massa molar?
c) O que significa dizer que a massa molar do carbonato de cálcio é de 140 g/mol?
d) Qual é a massa de 3,8 mol de CaCO3.​

The width of a piece of rectangular land is 5m shorter rhan 1/3 of its length .find the width of the land if the length is 60m,150m.

The narrative structure of the popular movies can be broken down into

Evaluate the scenario below and indicate how to handle the matter appropriately. situation: michael received an e-mail from what he thought was his doctor’s office, requesting his social security number. since he had just been in to see his doctor last week, he replied to the e-mail with his social security number.