Answer:
Mass= 314.96 grams
Explanation:
The density of the substance is defined as mass per unit volume of it.
The formula is :
![density=\frac{mass}{Volume}](https://tex.z-dn.net/?f=density%3D%5Cfrac%7Bmass%7D%7BVolume%7D)
<u><em>Unit conversion:</em></u>
1 liter = 1000 ml
![1dm^{3}=1Liter](https://tex.z-dn.net/?f=1dm%5E%7B3%7D%3D1Liter)
So
....(1)
![1dm^{3} = (10cm)^{3}](https://tex.z-dn.net/?f=1dm%5E%7B3%7D%20%3D%20%2810cm%29%5E%7B3%7D)
![1dm^{3}=1000cm^{3}](https://tex.z-dn.net/?f=1dm%5E%7B3%7D%3D1000cm%5E%7B3%7D)
Replace The dm3 by cm3 in (1)
![1000cm^{3}=1000mL](https://tex.z-dn.net/?f=1000cm%5E%7B3%7D%3D1000mL)
<u>
</u>
<u>Volume = 254 mL = 254 cm3</u>
<em><u>Calculation of mass</u></em>
![density=\frac{mass}{Volume}](https://tex.z-dn.net/?f=density%3D%5Cfrac%7Bmass%7D%7BVolume%7D)
![1.24=\frac{mass}{254cm^{3}}](https://tex.z-dn.net/?f=1.24%3D%5Cfrac%7Bmass%7D%7B254cm%5E%7B3%7D%7D)
![mass=1.24\times 254](https://tex.z-dn.net/?f=mass%3D1.24%5Ctimes%20254)
Mass= 314.96 grams(or 315 grams)
Note: Always makes same units before solving the question. You can not determine the mass if Volume is in mL and Density is in g/cm3. Change mL into cm3 first
Answer:
A = 0.023 m
Explanation:
The relation between the frequency of a radiation and its wavelength is given by the following expression.
where,
c is the speed of light (it has a constant value of 3.00 x 108 m/s)
A is the wavelength of the radiation v is the frequency of the radiation
In this case, the frequency is 13 GHz = 13 x
10° Hz = 13 x 1o° s-
The wavelength associated with this frequency is:
A = c/v = (3.00 x 10° m/s)/(13 x 10° s-") = 0.023
Hydrofloric acid is weak because of the weak bond between H and F..
which can be easily broken by applying little energy and resultant will be water
Answer:
Amount of salt
Explanation:
Since he is testing the speed of rusting depending on the mass of salt, the variable he should change in the experiment is the amount of salt.
The type of nail and the time the nail is left in the test tube should not change in order to keep the experiment fair. How much of the nail has gone rusty is a dependent variable and depends on the amount of salt.
Answer:
An ion is a charged atom or molecule. Ions are formed by the addition of electrons to, or the removal of electrons from, neutral atoms or molecules or other ions. Positive ions are called cations and negatively charged ions are called anions.