Calculate the number of moles of the following:
188.0 g zn
24.2 l of ch4 at stp
1.4 x 1023 molecules of c6h1206

Number of moles of Zn = 2.88 mol

Number of moles CH₄ = 1.08 mol

0.232 mole of C₆H₁₂O₆

Explanation:

Given data:

Mass of Zn = 188.0 g

Number of moles of Zn = ?

Solution:

Number of moles = mass / molar mass

Number of moles = 188.0 g / 65.38 g/mol

Number of moles = 2.88 mol

24.2 L of CH₄ at STP.

PV = nRT

n = PV/RT

n = 1 atm . 24.2 L / 0.0821 atm. L. mol⁻¹ . K⁻¹ × 273.15 K.

n =  1 atm . 24.2 L / 22.43  atm. L. mol⁻¹

n = 1.08 mol

1.4 ×10³ molecules of C₆H₁₂O₆

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 × 10²³ is called Avogadro number.

For example,

18 g of water = 1 mole = 6.022 × 10²³ molecules of water

1.008 g of hydrogen = 1 mole = 6.022 × 10²³ atoms of hydrogen

For 1.4 ×10²³ molecules of C₆H₁₂O₆

1 mole = 6.022 × 10²³ molecules

(1 mole/6.022 × 10²³ molecules) × 1.4 ×10²³ molecules

0.232 mole of C₆H₁₂O₆

b.final

according to the u.s. department of agriculture, the label of "certified organic" comes with a set of highly regulated standards for environmental stewardship and resource conservation. some of these include maintenance and improvement of soil quality, prevention of ground and surface water contamination, greenhouse gas regulation, encouragement of biodiversity and conservation of water and energy (see references 1). organic practices integrate natural methods such as mulching, plant diversity, native and adapted plants, crop rotation and the introduction of beneficial insects to control pests without synthetic pesticides.

environmental implications of pesticides

synthetic pesticides ensure high crop yields. while effective in achieving this goal, pesticides contaminate soil, air, ground and surface water, as well as the plants and animals that come into contact with these contaminated sources. freshwater and marine organisms are particularly susceptible to pesticides through agricultural runoff. pesticides also reduce soil fertility (necessitating the use of synthetic fertilizers) and can travel far from the original source, contaminating water and air hundreds of miles from the location of application (see references 2).

health implications of organics

although a subject of particular debate, many recent findings show that organic food is healthier than conventionally grown food. according to the usda, an extensive european union-funded study found that organically grown foods contain more beneficial compounds, such as the vitamins and antioxidants needed to combat many diseases (see references 5). organic milk, meat and eggs are regulated to ensure they are free of hormones administered to conventional livestock and poultry.

health implications of pesticides

pesticides affect human health in three ways: through skin contact, inhalation and ingestion. acute and long-term exposure to pesticides can cause serious health problems for farmers who apply them. the majority of other people are affected by drinking contaminated water and eating contaminated marine life (see references 3). pesticides have been linked to neurological disorders, endocrine and reproductive disorders, immune system deficiencies and cancer. according to the world health organization, acute pesticide poisoning (app) is responsible for significant annual mortality, especially in developing nations (see references 4).

other important considerations

not every small farm or business owner can afford the costly certification process required to be considered "certified organic," even if the farm is not using chemicals. "transitional" farms include those that once used chemicals and are now transitioning to organic-only production. in addition, though organic farming methods offer obvious environmental benefit, an organic apple shipped from around the world creates a different set of environmental problems. locally grown food (particularly locally grown, organic food) is key in sustainable food production.