- What is 4.57 hours before midnight (12)? Considering that .5 = half an hour.?

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Calculate enthalpy for the following reaction A) Ca0(s) + 2HCl(g) => CaCl2(s) + H2O(g) B) 4FeO(s) +O2(g) => 2Fe203(s)? How do I find the volume of an inverted cone? The diameter is 6 in and the slant height is 6 in.? If f(x)=(integral of) (2sinx-sin2x/x^3)dx then limit(x tends to zero) (derivative of f(x) = ? How and why through processes of population adaptation and niche construction has biological evolution modified the hominin brain? Poll: Is the earth round or flat?