The answer is option e that is e. Iron and magnesium.
Dark silicates have a specific gravity of 3.2 to 3.6 and are composed primarily of silica tetrahedral and iron and magnesium.
Iron and magnesium is a component of dark silicates that have a specific gravity of 3.2 to 3.6.
So the answer is iron and magnesium.
Answer:
2390 CuO
Explanation:
2 NH3(g) + 3 CuO(s) ---> 3 Cu(s) + N2(g) + 3 H2O(g)
from reaction 3 mol 1 mol
given x mol 10.0 mol
x = 3*10.0/1 = 30.0 mol
M(CuO) = 63.5 + 16.0 = 79.5 g/mol
m(CuO) = 30.0 mol CuO * 79.5 gCuO/1 mol CuO = 2390 g CuO