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PilotLPTM [1.2K]
3 years ago
8

When should you start taking Collagen

Chemistry
2 answers:
masya89 [10]3 years ago
8 0
Age 18 is an ideal age. Collagen levels start to deplete after the age of 25. By 30-35 we lose 1-3%, by 45 it's expected that we've lost 20%+
k0ka [10]3 years ago
5 0
After 18 but you could also start at 25 or later
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I NEED HELP ASAP!!!
Rus_ich [418]

Explanation:

To answer this question, we'll need to use the Ideal Gas Law:

p

V

=

n

R

T

,

where

p

is pressure,

V

is volume,

n

is the number of moles

R

is the gas constant, and

T

is temperature in Kelvin.

The question already gives us the values for

p

and

T

, because helium is at STP. This means that temperature is

273.15 K

and pressure is

1 atm

.

We also already know the gas constant. In our case, we'll use the value of

0.08206 L atm/K mol

since these units fit the units of our given values the best.

We can find the value for

n

by dividing the mass of helium gas by its molar mass:

n

=

number of moles

=

mass of sample

molar mass

=

6.00 g

4.00 g/mol

=

1.50 mol

Now, we can just plug all of these values in and solve for

V

:

p

V

=

n

R

T

V

=

n

R

T

p

=

1.50 mol

×

0.08206 L atm/K mol

×

273.15 K

1 atm

= 33.6 L

this is not the answer but it will help you

do by the formula it is on the answer

3 0
3 years ago
Niobium-91 has a half-life of 680 years. After 2,040 years, how much niobium-91 will remain from a 300.0-g sample? 3 g 18.75 g 3
Vadim26 [7]
Amount of Niobium-91 initially
= 300/91 =3.2967mol
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therefore, amount left = 0.4121mol
mass of Niobium-91 remaining = 0.4121 ×91 =37.5g
7 0
3 years ago
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4 0
3 years ago
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ira [324]
I’m pretty sure it’s A.
8 0
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Naya [18.7K]
:  E) 1000 = 10^3 
6-3 = 3 ==> change is 10^3
HOPE I COULD HELP
4 0
3 years ago
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