<span>The correct answer among
the choices given is the last option. Galaxies are classified according to
their shapes or visual morphology. There three main types of galaxies
currently. They are the elliptical, spiral and irregular. Elliptical galaxies
are like a spheroid or an elongated sphere. Spiral galaxies are characterized
and distinguished by having a bulge, a disk and a halo. Lastly, irregular
galaxies do not have regular or symmetrical shape.</span>
This problem is describe the mole-ratio composition of an allow composed by tin, lead and cadmium. Ratios are given as Sn:Pb 2.73:1.00 and Pb:Cd is 1.78:1.00, and we are asked to calculate the mass percent compositon of Pb in the allow.
In this case, according to the given information, it turns out possible realize that the following number of moles are present in the alloy, according to the aforementioned ratios:
Next, we calculate the masses by using each metal's atomic mass:
Thus, the mass percent composition of each metal is shown below:
So that of lead is 34.9 %.
Learn more:
Answer:
Substances that absorb energy in the form of heat are
b)endothermic.
hope it helps :)
In a solid, molecules are packed together, and it keeps its shape. Liquids take the shape of the container. ... Molecular motion for the particles in a solid is confined to very small vibrations of the atoms around their fixed positions; therefore, solids have a fixed shape that is difficult to change. That’s all if you want brainliest would be nice
