Decomposition of stone due to acid rain<span />
Answer:
2,981g
Explanation:
Firstly, we need to find the number of moles of MgCl that we have by using the formula: mass = No. Moles x Molar Mass, which we can rearrange so that we are solving for no. moles:
No. Moles = mass / Molar Mass
We are given a mass of 621g, and we can calculate the molar mass of MgCl by adding the two molar masses together: 24.31+35.45 = 59.76
Now we can calculate number of moles by substituting these values into the formula:
n = 621 / 59.76
No. moles = 10.4
Now we can use the co-efficients in the formula to tell us how many moles of AgCl will be formed. The coefficient of MgCl is 1, and the coefficient of AgCl is 2. This means that every 1 mol of MgCl will form 2 moles of AgCl. So, to find the no. moles of AgCl, we multiply our no. moles by 2:
10.4 x 2 = 20.8 moles
Finally we convert this back into mass by multiplying the no. moles by the Molar mass of AgCl:
m = 20.8 x (107.87+35.45)
m = 2,981g
Answer is (4) - 4.
The atomic number of Germanium (Ge) is 32 and it is placed in 14th group of periodic table. In the neutral atom, 32 electrons are present. The electron configuration of Ge is [Ar] 3d¹⁰ 4s² 4p².
Valence electrons are the electrons which are in outer shell of the atom. There are 4 electrons in outer shell of Ge atom at ground state.
Answer:
no only physical
Explanation:
for both of those their chemical properties do not change but their physical properties do making them physical changes
