PLEASE HELP (25 POINTS) I've done the rest but these last 3 questions, I need help on :) We are given the answer but need to show the work to getting that answer for credit. Even just instructions will help, thank you!
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1.) Calculate the mass in grams of 3.50 x 10^25 atoms of lithium.
404g Li
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2.) How many molecules of Mg3N2 (magnesium nitride) are formed when excess Mg (magnesium) reacts with 24.3 moles of N2 (nitrogen gas)?
3Mg(s) + N2(g) → Mg3N2(2)
43.1 molecules Mg3N2
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3.) 32.5 grams of NaOH (sodium hydroxide) reacts an excess of CO2 (carbon dioxide).
2NaOH(s) + CO2(g) → Na2CO3(s) + H2O(I)

a.) What is the theoretical yield of Na2CO3 in grams?
43.1g Na2CO3

b.) If 16.45g of Na2CO3 is formed, what is the percent yield?
38.2%
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Will mark brainliest! :)

In meteorology, a  cloud  is an aerosol consisting of a visible mass of minute liquid droplets, frozen crystals, or other particles suspended in the atmosphere of a planetary body. nephology is the science of  clouds, which is undertaken in the  cloud  physics branch of meteorology.cirrus clouds  usually describe clouds high in the atmosphere that can include wispy clouds, typically with ice crystals. variations include cirrus, cirrocumulus and cirrostratus as defined by the cloud's position in the atmosphere.layered stratus clouds  have both flat tops and bases, and can appear as if they take up the whole sky, stretching from horizon to horizon. other combinations and variations include stratus, stratocumulus, nimbostratus and altostratus.cumulus clouds  often pile up in multiple layers of the atmosphere, representing clouds that develop vertically. cumulus clouds often look like pillars with anvil-type tops or columns of clouds stacked vertically. variations include cumulus, cumulus-congestus, cumulonimbus and altocumulus.

Temperature and pressure

If you open the bottle of perfume then nothing but the smell will come out of it and yes it is a type of gas smell because it’s say it in english so i can understand better and you

The answer is celsius