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3 years ago

Can y’all help with question 17

Chemistry

1 answer:

GalinKa [24]3 years ago

5 0

Answer:

7. Option 2. Atom 1 and Atom 4

8. The same number of valence electron

Explanation:

7. Determination of which symbol represent an isotope.

Isotopes are atoms having the same atomic number but different mass number due to the difference in the neutron number.

From the question given above, the following were obtained:

Z => atomic number

A => mass number

Atom >>> Isotope >>>>> Z >>>> A

1 >>>>>>> ¹⁷₇E >>>>>>>> 7 >>>> 17

2 >>>>>>> ¹⁷₈E >>>>>>> 8 >>>> 17

3 >>>>>>> ¹⁸₆E >>>>>>> 6 >>>> 18

4 >>>>>>> ¹⁸₇E >>>>>>> 7 >>>> 18

From the table above, only atom 1 and 4 has the same atomic number. Hence, atom 1 and atom 4 are isotopes.

8. To know the correct answer to the question, we shall write the electronic configuration of magnesium and calcium. This can be obtained as follow:

Mg (12) => 1s² 2s²2p⁶ 3s²

Valence electron => 2

Ca (20) => 1s² 2s²2p⁶ 3s²3p⁶ 4s²

Valence electron => 2

We can see that magnesium and calcium both have the same valence electron. Hence, they will have similar chemical properties.

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Answer:

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Explanation:

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4 years ago

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3 years ago

The reaction for photosynthesis producing glucose sugar and oxygen gas is:

Anvisha [2.4K]

1.5 grams of glucose is produced from 2.20 g of CO₂.

To find the mass of glucose produced, first you must know the balanced reaction. For this, the Law of Conservation of Matter is followed.

The law of conservation of matter states that since no atom can be created or destroyed in a chemical reaction, the number of atoms that are present in the reagents has to be equal to the number of atoms present in the products.

So, in this case, the balanced reaction is:

6 CO₂ + 6 H₂O → C₆H₁₂O₆ + 6 O₂

By stoichiometry of the reaction (that is, the relationship between the amount of reagents and products in a chemical reaction), the amounts of moles of each reactant and product participate in the reaction:

CO₂: 6 moles
H₂O: 6 moles
C₆H₁₂O₆: 1 mole
O₂: 6 moles

So, you know that 2.20 g of CO₂ react, whose molar weight is 44.01 g/mole. By definition of molar mass, 1 mole of CO₂ has 44.01 g. So, the number of moles that 2.20 grams of the compound represent is calculated as:

$moles of CO_{2} =2.20 grams*\frac{1 mole}{44.01 grams}$

moles of CO₂= 0.05 moles

Now you must follow the following rule of three: if by stoichiometry of the reaction 6 moles of CO₂ produce 1 mole of C₆H₁₂O₆, 0.05 moles of CO₂ produce how many moles of C₆H₁₂O₆?

$moles of C_{6} H_{12} O_{6} =\frac{0.05moles of CO_{2} *1 mole of C_{6} H_{12} O_{6}}{6moles of CO_{2}}$

moles of C₆H₁₂O₆= 8.33*10⁻³

Being the molar mass of glucose 180.18 g/mole, the mass that 8.33*10⁻³ moles of the compound represent is calculated as:

$mass of glucose =8.33*10^{-3} moles*\frac{180.18 grams}{1 mole}$

mass of glucose= 1.5 grams

Then, 1.5 grams of glucose is produced from 2.20 g of CO₂.

5 0

3 years ago