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poizon [28]
2 years ago
7

Write the symbol for every chemical element that has atomic number less than 13 and atomic mass greater than 17.2 u.

Chemistry
1 answer:
forsale [732]2 years ago
4 0
I’m so sorry don’t know just need the points asap
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What reaction might we use to synthesize nickel sulfate, NiSO4?
guapka [62]

As I understand from your question, we should synthesize nickel sulfate first from nickel (II) oxide and sulfuric acid and second from nickel carbonate and sulfuric acid.

The chemical reactions will look like this:

NiO (s) + H₂SO₄ (aq) → NiSO₄ (aq) + H₂O (l)

NiCO₃ (aq)* + H₂SO₄ → NiSO₄ (aq) + H₂CO₃ (aq)

but carbonic acid will decompose to carbon dioxide and water

H₂CO₃ (aq) → CO₂ (g) + H₂O (l)

(*) NiCO₃ has a poor solubility in water, but enough to start the reaction.

8 0
3 years ago
2NO(g) + O2 (g) --> 2NO2
Lorico [155]
Take 46g / 46 g/mol = 1 mol NO2 produced
1 mol * 1/2 = 0.5 mol O2 needed  (1/2 ratio between NO2 and O2)
4 0
2 years ago
15 pts The drop down items have the same options for all sections labeled choose an item
tia_tia [17]

Answer:

#8 : 21.5 L of CH₄

#9 : 36 g of H₂O

#9 : 5.4 x 10²² molecules of CO₂

Explanation:

#8 : Part 1.

Data given:

no. of moles of CH₄ = 0.960 mol

volume of CH₄ = ?

Solution

volume can be calculated by following formula

          No. of moles = Volume of gas / molar volume

Rearrange the above equation

            Volume of gas = No. of moles x molar volume . . . . . . (1)

Where

molar volume = 22.4 L/mol

Put values in equation 1

           Volume of gas = 0.960 mol x 22.4 L/mol

           Volume of gas = 21.5 L

So,

By calculation 0.960 moles have 21.5 L volume of CH₄

_______________

#9 : Part 2.

Data given:

no. of moles of H₂O = 2.0 mol

mass of H₂O = ?

Solution

volume can be calculated by following formula

          No. of moles = mass in grams / molar mass

Rearrange the above equation

            mass in grams = No. of moles x molar mass . . . . . . (2)

Where

molar mass of H₂O = 2 (1) + 16

molar mass of H₂O = 18 g/mol

Put values in equation 2

      mass in grams = 2.0 mol x 18 g/mol

        mass in grams = 36 g

So,

By calculation 2.0 moles have 36 g mass of H₂O

________________

#10 : Part 3.

Data given:

volume of CO₂ = 2 L

no. of molecules of CO₂ = ?

Solution

First we have to find out number of moles of CO₂

Following formula will be used

          No. of moles = Volume of gas / molar volume

Where

molar volume = 22.4 L/mol

Put values in above equation

           No. of moles = 2 L / 22.4 L/mol

           No. of moles = 0.0893 mol

So,

No. of moles of CO₂ = 0.0893 mol

Now

we will calculate number of molecules by using following formula

          No. of moles = no. of molecules / Avogadro's number

Rearrange the above equation

            no. of molecules = No. of moles x Avogadro's number . . . . . . (3)

Where

Avogadro's number = 6.022 x 10²³

Put values in above equation 3

            no. of molecules =  0.0893 mol x 6.022 x 10²³

            no. of molecules =  5.4 x 10²²

So,

By calculation 2 L of CO₂ have 5.4 x 10²² molecules of CO₂

8 0
3 years ago
Help Me Just One Question Okay
Alex17521 [72]

Answer:

respiration

Explanation:

respiration means break down of food for production of energy

photosynthesis is the process by which plants produce there own food

7 0
3 years ago
2H2 + O2 2H2O
madam [21]

Answer:your have to motpliy

Explanation:This is directly related to the number

7 0
3 years ago
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