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>
A closed economy<span> is self-sufficient, meaning no imports are brought in and no exports are sent out, the goal being to provide consumers with everything they need from within the </span>economy's borders. An example would be how <span>Brazil's is an unusually </span>closed economy<span> as measured by trade penetration, with exports plus imports equal to just 27.6 per cent of GDP in 2013.</span>
Answer:
Mn
Explanation: 4th shell so 4th row and count 7 from the left most column
We have different colored eyes because of the result of the amount of melanin that each person has in their genes. People who have very little will usually have lighter colored eyes like blue while people with more melanin usually have darker colored eyes . like brown
1 mole MgS2O3=24+2*32+3*16=136g
229g MgS2O3 = 229/136=1.6838 moles