What is the mass percentage composition of potassium in saltpeter, #KNO_3#?

Answer 1

#%K# by mass in #KNO_3="Mass of metal"/"Mass of compound"xx100%#

And thus...............we interrogate the molar masses of the compound, and of potassium.....

#K%=(39.1*g*mol^-1)/(101.1*g*mol^-1)xx100%~=39%#

How did I know the atomic mass of potassium?

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Answer 2

The mass percentage composition of potassium in saltpeter, KNO3, is approximately 38.7%.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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