Answer:
See attached image
Explanation:
I highly recommend doing these yourself. They are very easy. Just move the decimal and add zeros according to the prefixes. The attached chart should help you know how many zeros to add, and where.
A battery
Mitochondria is the power house of a cell
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.
In the sun nuclear reaction called proton-proton cycle occurs. During these processes four hydrogen atoms are combined in a series of reactions to form one Helium atom; this chain of reactions is coupled by release of energy in the form of gamma rays and other particles called neutrons. Therefore, i believe the appropriate answer would be, nuclear reaction fuse atoms of hydrogen to make helium atoms.
The answer is 0.001515, I hope this helps!