Chemistry, 27.10.2020 19:40 mprjug6

Sources of energy can come from what?

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Answer from: fatty18

Explanation:

Fossil fuels, nuclear power, renewable resources.

Balanced Equation: 2NaHCO3 → Na2CO3 + H2CO3

Step 1: Convert 3.24 grams NaHCO3 to moles NaHCO3 by dividing by molar mass

- 3.24 g NaHCO3 / (22.99 + 1.008 + 12.01 + 3(15.999)) g/mol NaHCO3 = 0.039 moles

Step 2: Use mol:mol ratio to convert moles NaHCO3 to moles H2CO3

- 0.039 mol NaHCO3 x 1 mol H2CO3 / 2 mol NaHCO3 = 0.0195 moles H2CO3

Step 3: Convert to grams H2CO3 by multiplying by molar mass

- 0.0195 moles H2CO3 x ( 2(1.008) + 12.01 + 3(15.999)) = 1.209 grams H2CO3

Second: Calculate the actual yield of carbonic acid, using the (3.24 - 2.19) 1.05 grams NaHCO3 that actually decomposed.

Step 1: Convert 1.05 grams NaHCO3 to moles NaHCO3 by dividing by molar mass

- 1.05 g NaHCO3 / (22.99 + 1.008 + 12.01 + 3(15.999)) g/mol NaHCO3 = 0.0125 moles

Step 2: Use mol:mol ratio to convert moles NaHCO3 to moles H2CO3

- 0.0125 mol NaHCO3 x 1 mol H2CO3 / 2 mol NaHCO3 = 0.0063 moles H2CO3

Step 3: Convert to grams H2CO3 by multiplying by molar mass

- 0.0063 moles H2CO3 x ( 2(1.008) + 12.01 + 3(15.999)) = 0.388 grams H2CO3

Third: Calculate percent yield by dividing actual yield by theoretical yield, and multiplying by 100

0.388 g H2CO3 / 1.209 g H2CO3 (x 100%) = 32.06% yield.

Answer from: hardyfombu

Primary energy sources take many forms, including nuclear energy, fossil energy -- like oil, coal and natural gas -- and renewable sources like wind, solar, geothermal and hydropower. Our energy supply comes mainly from fossil fuels, with nuclear power and renewable sources rounding out the mix. These sources originate mostly in our local star, the Sun. Electricity falls into its own category because it's an energy carrier and not a primary source.

Answer from: Quest

you need to give more information

Answer from: Quest

clouds form

solid ice forms on leaves.

water droplets form on grass.

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