I choose the letter c witch is density I believe that it’s useful for determining identifying relationships between substances
Answer:
They attract or repel other charged objects without touching them.
Explanation:
My chemistry teacher always says like repels like opposite attracts.
Answer:
These three numbers, n, ℓ, and s can be used to describe an electron in a stable atom.
Explanation:
Each electron's quantum numbers are unique and cannot be shared by another electron in that atom. This property is called the Pauli Exclusion Principle.
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Answer:
D) all of the above
Explanation:
<em>Which of the following represents 1 mol of phosphine gas, PH₃? </em>
<em>A) 6.02 x 10²³ phosphine molecules.</em> YES. Considering Avogadro's number, 1 mole of a substance contains 6.02 x 10²³ molecules of such substance.
<em>B) 34.00 g phosphine gas.</em> YES. The molar mass of phosphine is equal to the sum of the molar masses of the elements that form it.
MM(PH₃) = MM(P) + 3 × MM(H) = 31.00 g/mol + 3 × 1.00 g/mol = 34.00 g/mol.
<em>C) 22.4 L phosphine gas at STP.</em> YES. At standard temperature (0 °C) and pressure (1 atm), 1 mole of any gas occupies a volume of 22.4 L.
B it is a molecule. Not really much to explain about it.