Answer:
B. 0.2.
Explanation:
<em>n = mass/molar mass</em>
mass of CaCO₃ = 20 g, molar mass of CaCO₃ = 100.0869 g/mol.
<em>∴ n = mass/molar mass = </em>(20 g)/(100.0869 g/mol) <em>= 0.1998 ≅ 0.2 mol.</em>
<em></em>
<em>So, the right choice is: B. 0.2.</em>
1.75 moles or 1.8 moles if you’re rounding in terms of sig figs
The valence of helium is 0.
Answer: No but yes if that made since
Explanation: unless every male or female suddenly leaves the facility we ain't going nowhere