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Question #338a0

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Jul 18, 2017

#6 125g=6.125*10^(-3)kg#

Explanation:

Formula is #m_l=m_s*0.5^(t/h)#, where:
#m_l# = mass left
#m_s# = starting mass
#t# = time
#h# = half life

Unit time for #h# and #t# must be the same.

So, we have #m_l=98*0.5^(80/20)#, where #80# and #20# are the same unit of time.

#80/20=4#

#98*0.5^4=6.125g#

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