Answer:
atom is the smallest indivisible particle of an element
Explanation:
The symbol of 20 element are H He li Be B C N O F Ne Na Mg Al Si P S Cl Ar K Ca
element is the simplest pure form of a substance .
Cr₂O₃ ( s ) + 3H₂S ( g ) → Cr₂S₃ ( s ) + 3H₂O ( l )
mol Cr₂S₃ = 421 : 200.19 g/mol = 2.103
mol Cr₂O₃ ≈ mol Cr₂S₃ = 2.103 ( equivalent coefficient)
mass Cr₂O₃ = 2.103 x 151.99 g/mol = 319.63 gr
Molar mass of copper is 63.546
so malar mass of the laccase is
4* 63.546
-------------- = 651.754
0.39
The answer is either number one or two.
Specific heat capacity of any substance comes with the unit : J/(g*degree C)
for molar capacity , change gram -> moles unit ( J / moles * degree C)
4.18 J / mol - degree C
H = 1.01 g * 2 = 2.02 g
O = 16 g
2.02 + 16 = 18.02 g
Now :- 4.18 J / mol- degree C) * 18.02 / 1 mole H2O
molar heat = 75.3 J / mol - degree C
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