Answer:
SiO2 + 2C - - > Si + 2CO
Explanation:
Everything should balance out now. The same number of atoms of each kind on each side
Answer:
2.13 × 10²² moles
Explanation:
Relation between Mole and Mass is,
Mole = Mass / M.Mass
Putting values,
Mole = 2.3 × 10²⁴ g / 107.87 g/mol
Mole = 2.13 × 10²² moles
Answer:
16.8%
Explanation:
31% NaOH molar mass 40 gm
69% H2O molar mass 18 gm
1000 gm would be
310 gm NaOH or 310/40 = 7.75 moles
690 gm of H2O or 690/18 = 38.333 moles
7.75 / (7.75 + 38.333) = .168 mole fraction
Each element absorbs light at specific wavelengths unique to that atom. When astronomers look at an object's spectrum, they can determine its composition based on these wavelengths. The most common method astronomers use to determine the composition of stars, planets, and other objects is spectroscopy.
hope this helps you! :-)