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Amixture was found to contain 1.50 g #NH_4Cl#, 0.80 g #NaCl#, and 1.20 g #SiO_2#. What is the percentage of sand in this mixture?

Answer 1

Avery Adams

#"Percentage of sand"# #=# #"Mass of sand"/"Mass of mixture"xx100%#

#"Percentage of sand"# #=# #(1.20*g)/(1.20*g+1.50*g+0.80*g)xx100%# #~=# #30%?#

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Answer 2

Noah Aldrich

To find the percentage of sand in the mixture, first calculate the total mass of the mixture, then subtract the mass of NH4Cl and NaCl from the total mass to find the mass of SiO2, and finally calculate the percentage of SiO2 in the mixture using its mass and the total mass of the mixture.

Total mass of the mixture = Mass of NH4Cl + Mass of NaCl + Mass of SiO2

Mass of SiO2 = Total mass of the mixture - (Mass of NH4Cl + Mass of NaCl)

Percentage of SiO2 in the mixture = (Mass of SiO2 / Total mass of the mixture) * 100%

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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.