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3 years ago

Which of the following combinations would form a buffer solution?

Chemistry

1 answer:

Schach [20]3 years ago

6 0

Answer:

d . all of the above

Explanation:

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

A weak acid and its conjugate base
A weak base and its conjugate acid

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.

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How many molecules are present in one mole of c6h12o6?

Liula [17]

1.3 × 1010 molecules

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3 years ago

Heating 2.40 g of the oxide of metal X (molar mass of X = 55.9 g/mol) in carbon monoxide (CO) yields the pure metal and carbon d

Korolek [52]

Answer:The molecular formula of the oxide of metal be $X_2O_3$ . The balanced equation for the reaction is given by:

$X_2O_3+3CO\rightarrow 3CO_2+2X$

Explanation:

Let the molecular formula of the oxide of metal be $X_2O_y$

$X_2O_y+yCO\rightarrrow yCO_2+2X$

Mass of metal product = 1.68 g

Moles of metal X = $\frac{1.68 g}{55.9 g/mol}=0.03005 mol$

1 mol of metal oxide produces 2 moles of metal X.

Then 0.03005 moles of metal X will be produced by:

$\frac{1}{2}\times 0.03005 mol=0.01502 mol$ of metal oxide

Mass of 0.01502 mol of metal oxide = 2.40 g (given)

$0.01502 mol\times (2\times 55.9 g/mol+y\times 16 g/mol)=2.40 g$

y = 2.999 ≈ 3

The molecular formula of the oxide of metal be $X_2O_3$ . The balanced equation for the reaction is given by:

$X_2O_3+3CO\rightarrow 3CO_2+2X$

8 0

3 years ago

PLEASE HELP ASAP I will mark brainliest

anyanavicka [17]

Answer:

Please explain the question nicely first

6 0

3 years ago

Read 2 more answers

Which best describes the purpose of this blog post?

Yakvenalex [24]

Answer:

its the first option

Explanation:

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4 years ago

Calcule la normalidad de una solución

tensa zangetsu [6.8K]

Answer:

si por favor

Explanation:

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3 years ago