How many moles of hcl are in a 20 ml sample of 0.10 mole hcl

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Convert from mL to L:

20/1000 = 0.02

n = c x v

Substitute values in:

n = 0.1 x 0.02 = 0.002 moles

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0.002 moles HCl.

Explanation:

There is 0.10 moles in 1 liter so in 20 mls the number of moles

= 0.10 *  20  / 1000

= 0.002 moles.

i just calculated it all out, and not including weekends, and all the different days off. as of this school year (2018-2019) students are spending 2198 hours in school this year