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Sladkaya [172]
3 years ago
5

A person's heartbeat is 68 beats per minute. If his/her heart beats 3.1e9 times in a lifetime, how long (in whole years) does th

e person live? Disregard leap years.
Chemistry
2 answers:
kari74 [83]3 years ago
8 0
To determine the number of years for a person to live, we can divide the total number of beats in a lifetime to the number of beats per minute. We first need to check if the units are similar so we can cancel them. We do as follows:

3.1x10^9 beats / 68 beats per minute = 45588235.29 minutes ( 1hr / 60 min ) ( 1 day/24hr) ( 1 year / 365 days ) = 87 years

Hope this answers the question. Have a nice  day.
nata0808 [166]3 years ago
6 0

Answer:

The person has lived 87 years long life.

Explanation:

Rate of the heart beat of the person = 68 beats/min

Let the age of the person be X.

Total heart beats in his X years of life = 3.1\times 10^9 beats

\frac{3.1\times 10^9 beats}{X}=68 beats/ min

X=\frac{3.1\times 10^9 beats}{68 beats/ min}

X = 45,588,235.29 min

1 year = 365 days

1 day = 24 hours

1 hours = 60 mins

1 year = 365 × 24 × 60 min  = 525,600 min

X = \frac{45,588,235.29}{525,600} year=86.73 years\approx 87 years

The person has lived 87 years long life.

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The acid dissociation constant is 1.3 × 10^-3.

<h3>What is acid-dissociation constant?</h3>

The acid-dissociation constant is a constant that shows the extent of dissociation of an acid in solution. We have to set up the reaction equation as shown below;

Let the acid be HA;

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since the pH of the solution is 2.57 then;

[H3O^+] = Antilog(-pH) = Antilog(-2.57) = 2.7 × 10^-3

We can see that; [H3O^+]  = [A^-] so;

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What are the molality and mole fraction of solute in a 22.3 percent by mass aqueous solution of formic acid (HCOOH)?
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Mole fraction for solute = 0.1, or 10%

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Mass of solute = 22.3 g

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Let's convert the mass to moles

22.3 g . 1mol/ 46 g = 0.485 moles

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Total moles = 4.32 moles + 0.485 moles = 4.805 moles

Xm for solute = 0.485 / 4.805 = 0.100 → 10%

Molality → mol/ kg → we convert the mass of solvent to kg

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This method(Using H2So4) will work for all hydrogen hydrogen halide except Hydrogen Iodide and Hydrogen Bromide.

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Explanation:

4 0
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