Answer:
46 g
Explanation:
First we <u>convert 1.2 x 10²⁴ atoms of sodium into moles</u>, using <em>Avogadro's number</em>:
- 1.2x10²⁴ atoms ÷ 6.023x10²³ atoms/mol = 2.0 mol
Then we <u>convert 2.0 moles of sodium into grams</u>, using <em>sodium's molar mass</em>:
- 2.0 mol Na * 23 g/mol = 46 g
Thus, there are 46 grams in 1.2x10²⁴ atoms of sodium.
The kinda of energy the involves the flow of positive charge is Electrical
Answer:
![0.8696\ \text{J/g}^{\circ}\text{C}](https://tex.z-dn.net/?f=0.8696%5C%20%5Ctext%7BJ%2Fg%7D%5E%7B%5Ccirc%7D%5Ctext%7BC%7D)
Explanation:
= Mass of metal = 19 g
= Specific heat of the metal
= Temperature difference of the metal = ![99-23=76^{\circ}\text{C}](https://tex.z-dn.net/?f=99-23%3D76%5E%7B%5Ccirc%7D%5Ctext%7BC%7D)
V = Volume of water = 150 mL = ![150\ \text{cm}^3](https://tex.z-dn.net/?f=150%5C%20%5Ctext%7Bcm%7D%5E3)
= Density of water = ![1\ \text{g/cm}^3](https://tex.z-dn.net/?f=1%5C%20%5Ctext%7Bg%2Fcm%7D%5E3)
= Specific heat of the water = 4.186 J/g°C
= Temperature difference of the water = ![23-21=2^{\circ}\text{C}](https://tex.z-dn.net/?f=23-21%3D2%5E%7B%5Ccirc%7D%5Ctext%7BC%7D)
Mass of water
![m_w= \rho V\\\Rightarrow m_w=1\times 150\\\Rightarrow m_w=150\ \text{g}](https://tex.z-dn.net/?f=m_w%3D%20%5Crho%20V%5C%5C%5CRightarrow%20m_w%3D1%5Ctimes%20150%5C%5C%5CRightarrow%20m_w%3D150%5C%20%5Ctext%7Bg%7D)
Heat lost will be equal to the heat gained so we get
![m_mc_m\Delta T_m=m_wc_w\Delta T_w\\\Rightarrow c_m=\dfrac{m_wc_w\Delta T_w}{m_m\Delta T_m}\\\Rightarrow c_m=\dfrac{150\times 4.186\times 2}{19\times 76}\\\Rightarrow c_m=0.8696\ \text{J/g}^{\circ}\text{C}](https://tex.z-dn.net/?f=m_mc_m%5CDelta%20T_m%3Dm_wc_w%5CDelta%20T_w%5C%5C%5CRightarrow%20c_m%3D%5Cdfrac%7Bm_wc_w%5CDelta%20T_w%7D%7Bm_m%5CDelta%20T_m%7D%5C%5C%5CRightarrow%20c_m%3D%5Cdfrac%7B150%5Ctimes%204.186%5Ctimes%202%7D%7B19%5Ctimes%2076%7D%5C%5C%5CRightarrow%20c_m%3D0.8696%5C%20%5Ctext%7BJ%2Fg%7D%5E%7B%5Ccirc%7D%5Ctext%7BC%7D)
The specific heat of the metal is
.
The density of the cube in grams per cubic centimeter = D = 2 gram / cm³
Explanation:
The Volume Of the Cube is V = a³
Its is given that the cube has sides measuring 5 cm each side.
V = ( 5 )³
= 5cm 5cm 5cm
V = 125 cm³
The Density Formula, Density= Mass / Volume.
Given that this cube has a mass of 250 grams.
to calculate density
D = ρ = m / V
= 250 / 125
= 2
D = 2 gram / cm³
We have gravity here on earth while in space there’s none