Calculate the [OH−] value with [H3O+]=3.0×10−9M.

How much heat energy is required to melt 337.1 g of HBr? The molar heat of fusion of HBr is 2.41 kJ/mol.

Kitty [74]

$m=337,1g\\
M_{HBr}=81\frac{g}{mol} \ \ \Rightarrow \ \ n=\frac{m}{M}=\frac{337,1g}{81\frac{g}{mol}}=4,2mol$

If 2,41kJ --- require ----- 1mol
so
Q ---- require ----- 4,2mol

$Q=\frac{4,2mol*2,41kJ}{1mol}=10,122kJ$

3 0

3 years ago

Read 2 more answers

What is name of: 1.Ca(H2PO4)2, 2.Fe(HSO4)2, 3.(CaOH)2SO4 4.Al(OH)Cl2

Sever21 [200]

1. Calcium hydrogen phosphate

2. Iron(II) Hydrogen Sulfate

3. Calcium hydroxide

4. Aluminum chloride hydroxide

7 0

2 years ago

Which of these solutes raises the boiling point of water the most?

VMariaS [17]

Raising of the boiling point is a colligative property. That means that it depends on the number of particles dissolved. The greater the number of particles the greater the increase in the boiling point. So, you can compare the effect of these solutes in the increase of the boiling point by writing the chemical equations and comparing the number of particles dissolved: 1)ionic lithium chloride, LiCl(s) --> Li(+) + Cl (-) => 2 ions; 2) ionic sodium chloride, NaCl(s) --> Na(+) + Cl(-) => 2 ions; 3) molecular sucrose, C12H22O11 (s) ---> C12H22O11(aq) => 1 molecule; 4) ionic phosphate, Na3PO4 --> 3Na(+) + PO4 (3-) => 4 ions; 5) ionic magnesium bromide, MgBr2 --> Mg(2+) + 2 Br(-) => 3 ions. So, ionic phosphate produces the greatest number of particles and it will cause the greatest increase of the boiling point.

4 0

3 years ago

A 5.0-gram sample of Fe(s) is to be placed in 100. milliliters of HCl(aq). Which changes will result in the fastest rate of reac

sveta [45]

The answer is increasing the surface area of Fe(s) and increasing the concentration of HCl(aq).

the rate of reaction can be increased if the interaction between the reactants in better. by increasing the surface area of a solid, such as Fe, you make more possible each molecule of Fe to interact with HCl. Also, by increasing the concentration of HCl, it mean there is more molecule of HCl to interact with Fe.

6 0

3 years ago

Small quantites of hydrogen gas can be prepared in the laboratory by the addition of aqueous hydrochloric acid to metallic zinc.

ira [324]

Answer: The mass or zinc reacted is 0.624 grams.

Explanation:

We are given:

Total pressure = 1.032 atm

Vapor pressure of water = 32 torr = 0.042 atm (Conversion factor: 1 atm = 760 torr)

To calculate partial pressure of hydrogen gas, we use the equation:

$p_{H_2}=p_T-p_{H_2O}\\\\p_{H_2}=1.032-0.042=0.99atm$