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notsponge [240]
3 years ago
7

A farmer wants to expand his fields, but only has hills left. He is worried about water erosion because of the rate at which wat

er is pulled down the hills during rainstorms. What can this farmer do to reduce the water erosion he fears?
a.Rotate his crops so that there is permanent groundcover.
b.Reshape the hills with terraces.
c.Use contour plowing on the hills.
d.Install silt fences at the bottom of the hills.
Chemistry
1 answer:
Aleks04 [339]3 years ago
7 0

Answer:

Reshape the hills with terraces

Explanation:

It is the best way of preventing water eroding when it comes of doing agriculture on hills

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Answer :

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The number of moles of ibuprofen in a single tablet is, 0.000969 moles

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Solution : Given,

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Molar mass of hydrogen = 1.01 g/mole

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1) Now we have to calculate the molar mass of ibuprofen.

Molar mass of ibuprofen, C_{13}H_{18}O_2 = (13\times 12.01)+(18\times 1.01)+(2\times 15.99)=206.29g/mole

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2) Now we have to calculate the moles of ibuprofen.

Formula used : Moles=\frac{Mass}{\text{ Molar mass}}

Given : Mass of ibuprofen = 200 mg = 0.2 g         (1 mg = 1000 g)

\text{ Moles of ibuprofen}=\frac{\text{ Mass of ibuprofen}}{\text{ Molar mass of ibuprofen}}=\frac{0.2g}{206.29g/mole}=0.000969moles

The moles of ibuprofen = 0.000969 moles

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Number of tablets in one dose = 2

Total number of tablets in 4 doses = 4 × 2 = 8

Number of moles of ibuprofen in 8 tablets =

\text{ Number of moles of ibuprofen in 1 tablet}\times \text{ Total number of tablets}=0.000969\times 8=0.007752moles

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