1.Calculate the mass of 0.5 moles of bromine atoms. 2.Calculate the mass of 0.5 moles of bromine molecules.

3. How many moles of oxygen molecules are in 54 g of oxygen?

Explanation is in the file

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d . all of the above

Explanation:

A buffer system can be formed in one of two ways:

Which of the following combinations would form a buffer solution?

a. HF and LiF. YES. HF is a weak acid and F⁻ (from LiF) is its conjugate base.

b. NH₃ and NH₄Br. YES. NH₃ is a weak base and NH₄⁺ (from NH₄Br) is its conjugate acid.

c. HNO₂ and NaNO₂. YES. HNO₂ is a weak acid and NO₂⁻ (from NaNO₂) is its conjugate base.