23) The law of constant composition states: 23) - A) The nucleus is a dense regi

Question

23) The law of constant composition states: 23) - A) The nucleus is a dense region of positive charge that always contains protons and neutrons. B) Matter cannot be either created or destroyed in a chemical reaction. C) All samples of a given compound have the same proportions of their constituent elements. D) All atoms of a given element have a constant composition and are different than atoms of any other element. E) none of the above 24) How many moles of Cu are in 1.48 1025 Cu atoms? SHOW ALL WORK 24) A) 24.6 B) 6.022 x 1023 C) 1.54 x 1025 D) 0.0408 4

Explanation / Answer

23)

this is a law whose correct statement is C

24)

moles of atoms = number of atoms / Avogadro’s number

= (1.48*10^25) / (6.022*10^23)

= 24.6 mol

Answer: 24.6 mol

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