G Aqueous hydrochloric acid will react with solid sodium hydroxide to produce aqueous sodium chloride and liquid water . Suppose 20. g of hydrochloric acid is mixed with 16.3 g of sodium hydroxide. Calculate the minimum mass of hydrochloric acid that could be left over by the chemical reaction. Be sure your answer has the correct number of significant digits.

5.1 gram

Explanation:

To calculate the moles :

According to stoichiometry :

1 mole of require = 1 mole of

Thus 0.41 moles of will require=  of

Thus is the limiting reagent as it limits the formation of product and is the excess reagent.

Moles of HCl left = (0.55-0.41) = 0.14

Mass of left =

Thus 5.1 g of hydrochloric acid  could be left over by the chemical reaction.

it can be observed without changing the identity of the object.

it depends on what substance you're talking about as well as many other factors. in quantum mechanics, the observation of particles affects the observers ability to measure certain properties. for example: you can know the velocity of a particle, but you can't know it's position; or you can know it's position, but not it's velocity. it's like trying to find out where a grain of sand is by throwing other grains of sand at it. once you find out where it is, it's been moved. it's also like trying to find an answer to the question of whether or not a tree falling in a forest makes a sound if nobody is there to hear it. paradoxically, the only way to find out is to be there and hear it.

metric time was an attempt to create a standard unit of time based off of 10, but it never took off an is not included in the metric system (si)