Home > Chemistry > Mole Ratios

If 10 raise to power 21 molecules are removed from 200 mg of CO2,then how many moles of CO2 are left?(Old and urgently dear experts)

Answer 1

Olivia Anton

#"Molar mass of "CO_2"=44g/"mol"#

#"Amount of "CO_2 " taken"=200mg=(0.2g)/(44g/"mol")# #=4.55xx10^-3mol#

#"Number of mlecules of "CO_2" removed"=10^21#

#"1 mol = "6.023xx10^23 "molecules of "CO_2#

#10^21" molecules "=10^21/(6.023xx10^23)mol#

#=1.66xx10^-3mol#

#CO_2" left"=(4.55-1.66)xx10^-3mol# #=2.89xx10^-3mol#

By signing up, you agree to our Terms of Service and Privacy Policy

Answer 2

Naomi Aronson

If 10^21 molecules are removed from 200 mg of CO2, then approximately 0.3307 moles of CO2 are left.

By signing up, you agree to our Terms of Service and Privacy Policy

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.