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Vera_Pavlovna [14]
3 years ago
12

What challenges do people in Africa face with regard to water and agriculture?

Geography
1 answer:
abruzzese [7]3 years ago
8 0

Answer:

Efforts to provide adequate water resources for Africa will, therefore, face several challenges, including population pressure; problems associated with land use such as erosion and/or siltation; and possible ecological consequences of land-use change on the hydrological cycle.

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What is the Wt% of SiO2 in augite?<br><br> (Ca, Fe, Mg, Na)(Mg,Fe,Al) (Si,Al)2 O6
vaieri [72.5K]

Answer:

The weight% of SiO_2 in augite is 13.16 %.

Explanation:

Atomic mass of calcium = 40 g/mol

Atomic mass of iron = 56 g/mol

Atomic mass of magnesium = 24 g/mol

Atomic mass of sodium = 23 g/mol

Atomic mass of aluminum = 27 g/mol

Atomic mass of silicon = 28 g/mol

Atomic mass of oxygen = 16 g/mol

Mass of SiO_2=28 g/mol+ 2\time 16 g/mol=60 g/mol

Molar mass of the augite (Ca, Fe, Mg, Na)(Mg,Fe,Al)(Si,Al)_2 O_6 = M

M=40 g/mol+2\times 56 g/mol+2\times 24 g/mol+23 g/mol+3\times 27 g/mol+2\times 28 g/mol+6\times 16 g/mol=456 g/mol

Weight% of SiO_2 in augite:

w\%=\frac{60 g/mol}{456 g/mol}\times 100=13.16\%

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The variety of plant and animal life supported by given habitat is defined as the level of
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The defined as the level of biodiversity
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Does populism provide an effective solution to the nations problems
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