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Georgia [21]
3 years ago
15

How is stoichiometry used to calculate amount of product from amount of reactant?

Chemistry
1 answer:
Nadusha1986 [10]3 years ago
5 0

Answer:

D. The coefficients give the ratio of mole reactant to moles product.

Explanation:

In stoichiometric calculations, the amount of product formed from reactants can be determined.

  • Using this approach, the number of moles of reactants and products on both sides of the expression must be balanced.
  • As a rule of thumb, the coefficients give the ratio of moles of reactants to moles of products.
  • This is very useful in a number of calculations using the stoichiometric approach.
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How many atoms are in 3.2 pg of Ca? The molar mass of Ca is 40.08<br> g/mol.
anyanavicka [17]

Answer:

4.81×10¹⁰ atoms.

Explanation:

We'll begin by converting 3.2 pg to Ca to grams (g). This can be obtained as follow:

1 pg = 1×10¯¹² g

Therefore,

3.2 pg = 3.2 pg × 1×10¯¹² g / 1 pg

3.2 pg = 3.2×10¯¹² g

Therefore, 3.2 pg is equivalent to 3.2×10¯¹² g

Next, we shall determine the number of mole in 3.2×10¯¹² g of Ca. This can be obtained as follow:

Mass of Ca = 3.2×10¯¹² g

Molar mass of Ca = 40.08 g/mol

Mole of ca=.?

Mole = mass /molar mass

Mole of Ca = 3.2×10¯¹² / 40.08

Mole of Ca = 7.98×10¯¹⁴ mole.

Finally, we shall determine the number of atoms present in 7.98×10¯¹⁴ mole of Ca. This can be obtained as illustrated below:

From Avogadro's hypothesis,

1 mole of Ca contains 6.02×10²³ atoms.

Therefore, 7.98×10¯¹⁴ mole of Ca will contain = 7.98×10¯¹⁴ × 6.02×10²³ = 4.81×10¹⁰ atoms.

Therefore, 3.2 pg of Ca contains 4.81×10¹⁰ atoms.

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3 years ago
Does a light with low frequency and long wavelength have a lot or little energy?
Rudik [331]
The lower the frequncy the longer the wavelength the longer the wavelength whoch would probably give you more energy.

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3 years ago
How can you turn mechanical energy into electrical energy
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Answer:

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Explanation:

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