To calculate the number of moles, the equation is mass of substance divided by the molar mass of substance.
Molar mass of Fe2O3 is the relative atomic mas of all the elements from the substance added up, which makes 55.845x2 + 16.0 x3 = 159.69g mol-1
So the number of moles is
545g / 159.69gmol-1
=3.41 mol (corrected to 3 sig. fig.)
The carbon = carbon double bonds in unsaturated fatty acids are restricting the movement of the molecule branches. They are more "kinked" up and do not pack as tightly. whereas, saturated fatty acids have more freedom of movement and tend to pack together better. Therefore, in the case of unsaturated fatty acids they can not compact tightly together and there are less van der Waals interactions between the molecules, and so the melting point is reduced.
Una dieta saludable proporciona la energía y los nutrientes necesarios para sobrevivir y mantenerse saludable. Combinar una dieta saludable con un estilo de vida activo tiene enormes beneficios y ayuda a reducir el riesgo de enfermedades cardíacas, cáncer y obesidad.
Answer:
when the velocity of an object changes,it is acted upon by an external force
Gravity holds the earth together with gravity because of the earth's axis the earth spins causing seasons. And that also effects the period of orbit.
