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3 years ago

If you had a sample of natural carbon containing exactly 10,000 atoms, determine the number of 12c and 13c atoms present.

1 answer:

8 0

Carbon 12 and carbon 13 are two naturally occurring isotopes of the element. Carbon 12 accounts for approximately 98.9 percent of naturally occurring carbon while carbon 13 accounts for approximately 1.1 percent. Therefore if a sample has 10,000 atoms, 9890 atoms would be carbon 12 and 110 atoms would be carbon 13.

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Which statement best describes how photosynthesis follows the law of conservation of mass?

leva [86]

Answer:

O The number of oxygen atoms in the reactants used by this process equals the total number of oxygen atoms in the products.

Explanation:

The statement that best describes how photosynthesis follows the law of conservation of mass is that the number of oxygen atoms in the reactants used by this process is equal to the total number of oxygen atoms in the products.

The equation of photosynthesis reaction is given as:

6CO₂ + 6H₂O → C₆ H₁₂ O₆ + 6O₂

According to the law of conservation of mass, matter is neither created nor destroyed during the course of a chemical reaction.

By the virtue of this, the number of oxygen atom on both sides of the expression must be the same. Also, the number of carbon and hydrogen atoms must also be the same.

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3 years ago

Atoms of nonmetallic elements form covalent bonds, but they can also form ionic bonds. how is this possible?

Olin [163]

No ionic bond is between metal and non metal and covalent bond is between two non metals

5 0

4 years ago

Can you plz help me with this question? thanks! question 6

spayn [35]

Sorry can't see clearly

8 0

3 years ago

How many atoms are in 2.70 moles of iron (Fe) atoms? (2 points)

Travka [436]

Hey there!

2.70 moles of Fe x (6.022 x 10^23) atoms of Fe = 1.63 x 10^24 atoms of Fe
_______________________
1 mole of Fe

Answer: 1.63 x 10^24 atoms of Fe

Hope this helps :)

7 0

3 years ago

How many dm3 of hydrogen are released when 3 g of potassium is reacted with hydroiodic acid?

nlexa [21]

Answer:

V = 0.0859dm³

Explanation:

Hydroiodic acid, HI, reacts with potassium, K, to produce potassium iodide, KI, and hydrogen, as follows:

2HI + 2K → 2KI + H₂(g)

To solve this question we have to find the moles of hydrogen produced knowing that 2 moles of K produce 1 mole of H₂. With the moles of hydrogen we can find the volume of hydrogen assuming there are STP conditions:

Moles K -Molar mass: 39.0983g/mol-

3g * (1mol / 39.0983g) = 0.0767 moles of K

Moles H₂:

0.0767 moles of K * (1mol H₂ / 2mol K) = 0.03836 moles H₂

Using: PV = nRT; V = nRT / P

Where V is volume in dm³,

n are moles of gas: 0.03836 moles,

R is gas constant = 0.082atm*dm³/molK

T is absolute temperature = 273.15K at STP

and P is pressure = 1atm

The volume of the gas is:

V = 0.03836mol*0.082atm*dm³/molK*273.15K / 1atm

8 0

3 years ago