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Anna [14]
3 years ago
11

Write the chemical formula of the following:

Chemistry
1 answer:
Elan Coil [88]3 years ago
5 0

Answer:

1.Ca(OH)2

2.Mg(OH)2

3.Al2SO4

4.Na2CO3

5.Zn3(PO4)2

6.LiNO3

7.CuCO3

8. K2CO3

9.MgSO4

10.Ca3(PO4)2

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Which element has a greater<br> ionization energy Manganese (Mn) or Selenium (Se)?
jok3333 [9.3K]

Answer:

manganese has greater ionization energy than Selenium

6 0
3 years ago
What is the Molar Mass of Iron(Fe)? and also state how many particles there are in one mole of iron.
Lunna [17]
The atomic mass is useful in chemistry when it is paired with the mole concept: the atomic mass of an element, measured in amu, is the same as the mass in grams of one mole of an element. since the atomic mass of iron is 55.847 amu, one mole of iron atoms would weigh 55.847 grams.
4 0
3 years ago
What will the subscript for NH4 be?
alisha [4.7K]

Answer:

2

Explanation:

The subscript on Ammoniumwhich is (NH4) is 2.

Hope this helped!

4 0
3 years ago
Rn-222 has a half-life of 3.82 days. If 25.0 g of Radon-22 was originally present, approximately how many grams would be left af
horsena [70]

Answer:

Approximately 0.39 g or 0.4 g if you're rounding up

Explanation:

15/3.82 = 3.92

Let's round that up to 4

That means 15 days is around 4 half lives

4 half lives means 1/16 of the original mass will be left

25/16 = 0.390625

6 0
4 years ago
At a certain temperature the vapor pressure of pure heptane (C_7 H_16) is measured to be 170. torr. Suppose a solution is prepar
steposvetlana [31]

Explanation:

The given data is as follows.

       Pressure (P) = 170 torr,      mass of heptane (m) = 86.7 g

First, we will calculate the number of moles as follows.

          No. of moles = \frac{mass}{\text{molar mass}}

                        = \frac{86.7 g}{100 g/mol}

                        = 0.867 mol

Now, the number of moles of CH_{3}COBr are calculated as follows.

     No. of moles =  \frac{mass}{\text{molar mass}}

                           =  \frac{125}{122.9}    

                           = 1.07

Therefore, mole fraction of heptane will be calculated as follows.

     Mole fraction = \frac{\text{moles of heptane}}{\text{total moles}}

                           = \frac{0.867}{0.867 + 1.07}

                           = \frac{0.867}{1.937}

                           = 0.445

Now, we will calculate the partial pressure of heptane as follows.

            P_{A} = x_{A}P^{o}_{A}

                 = 170 \times 0.445      

                 = 75.65 torr

Thus, we can conclude that the partial pressure of heptane vapor above this solution is 75.65 torr.

8 0
4 years ago
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