The molar mass is the mass of a given chemical element or chemical compound (g) divided by the amount of substance (mol). The molar mass of a compound can be calculated by adding the standard atomic masses (in g/mol) of the constituent atoms.
Answer:
A manually-operated lawn mower needs a lot of force to move. The mower mechanism and the energy needed to cut through the grass causes a lot of friction. In order to cut the grass faster, you need to overcome all that friction and get a net positive force on the lawn mower. Thus, you need to apply more force to it. It also helps a lot to reduce friction, so oil the mower and keep the blades sharp.
Explanation:
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White gold is yellow gold that has had other alloys added to it to make it appear white. New polished white gold has a bright white metal color. Depending of the type of alloys used in the fabrication of white gold, white gold jewelry tends to have a faint yellowish tint with wear.
Since the compound is 72.2% Mg then there would be 27.8% N. Then you can just change it to 72.2 g Mg and 27.8 g N.
then convert to moles by dividing by molecular mass.
72.2÷24.31=2.96 moles Mg
27.8÷14.01=1.98 moles N
then divided by the lowest number.
2.96÷1.98=1.5
Since it is 1.5 you multiply by 2. so you have 3 Mg
1.98÷1.98=1 N
so the empirical formula is Mg3N