Viscosity is how well a liquid can flow were as density is the mass per unit volume so if you heat up oil it will become less viscose and flow easier while its density remains about the same.
50cm3 of air is less dense than 50cm3 of lead as though they occupy the same volume their mass is different
hope that helps
Los hongos si son bacterias
inner core,core,outer core,mantle ,crust,water,atmosphere,
The mantle has a mass of around that is around 68.4% of earth's mass.
So to calculate moles we need to first find out the mass of oxygen and silicon present in mantle. It is given that oxygen is 44.8% by mass in mantle and 21.5% by mass in mantle, therefore to calculate its mass, we need to use
Now, to calculate mass percentage of oxygen
Similarly the mass of silicon can be calculated
Now, the moles of any substance is calculated by
where, mass of oxygen in kilograms is
So,
Similarly
Now, to calculate mole ratio we need to divide every moles to the lowest calculated mole that is the moles of Si and round it off to the nearest whole number.