If all the reactants will react and become products, the mass will be 12.5 g. Because the mass of the matter amount will not change during the reaction.
Answer:
You answer is correct
Electrons have a negative charge. The charge on the proton and electron are exactly the same size but opposite. Neutrons have no charge.
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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.
Detrivores; i.e, Earth Worms, Rolly Pollies etc.
Answer:
4066 decay/s
Explanation:
Given that:-
The weight of the person is:- 190 lb
Also, 1 lb = 453.592 g
So, weight of the person = 86182.6 g
Also, given that carbon is 18% in the human body. So,
Carbon-14 is 
of the carbon in the body. So,
Also,
14 g of Carbon-14 contains 
atoms of carbon-14
So,
of Carbon-14 contains 
atoms of carbon-14
Atoms of carbon-14 = 
Given that:
Half life = 5730 years
Where, k is rate constant
So,
The rate constant, k = 0.00012 years⁻¹
Also, 1 year = 
s
So, The rate constant, k = 
s⁻¹ = 
Thus, decay events per second = 
= 
= 4066 decay/s
