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Nata [24]
2 years ago
12

A compound with an approximate molar mass of

Chemistry
1 answer:
Sauron [17]2 years ago
4 0
G about the answer if I don’t do this I Will fail!!!!!! NO LINKS NO LYING
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The pH of a solution is measured as 4.5. What is the hydrogen ion concentration of the solution?
Bond [772]

Answer:

[H⁺] =  3.16 × 10⁻⁵ mol/L

Explanation:

Given data:

pH of solution = 4.5

Hydrogen ion concentration = ?

Solution;

pH = -log [H⁺]

we will rearrange this formula:

[H⁺] =  10∧-pH

[H⁺] = 10⁻⁴°⁵

[H⁺] =  3.16 × 10⁻⁵ mol/L

4 0
2 years ago
Which events represents a chemical change ?
8_murik_8 [283]
D milk turning sour 
the other options are physical changes
5 0
3 years ago
Read 2 more answers
Consider the reaction:
murzikaleks [220]

<u>Answer:</u> The formation of given amount of oxygen gas results in the absorption of 713 kJ of heat.

<u>Explanation:</u>

To calculate the number of moles, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}

Given mass of oxygen gas = 83 g

Molar mass of oxygen gas = 32 g/mol

Putting values in above equation, we get:

\text{Moles of oxygen gas}=\frac{83g}{32g/mol}=2.594mol

For the given chemical equation:

2Fe_2O_3\rightarrow 4Fe+3O_2;\Delta H^o_{rxn}=+824.2kJ

<u>Sign convention of heat:</u>

When heat is absorbed, the sign of heat is taken to be positive and when heat is released, the sign of heat is taken to be negative.

By Stoichiometry of the reaction:

When 3 moles of oxygen gas is formed, the amount of heat absorbed is 824.2 kJ

So, when 2.594 moles of oxygen gas is formed, the amount of heat absorbed will be = \frac{824.2kJ}{3mol}\times 2.59mol=713kJ

Hence, the formation of given amount of oxygen gas results in the absorption of 713 kJ of heat.

7 0
3 years ago
Determine the empirical formula for a compound containing 85.6 g of carbon and 14.4 g of hydrogen. Please show work
photoshop1234 [79]

Answer:C_{1}H_{2}

Explanation:

take gram & convert to mol (using the mm of the element) ,

85.6g C \frac{1 mol }{12.01g} = 7.12          14.4g H\frac{1 mol}{1.01g}  =14.2 then take the smallest number & divide  7.12/7.12 =1  14.2/7.12= 2. since the numbers are in whole numbers the answer is C_{1}H_{2}.

4 0
2 years ago
Which kind of force is a dipole-dipole force?
puteri [66]

Answer:An ion-dipole force is a force between an ion and a polar molecule. A hydrogen bond is a dipole-dipole force and is an attraction between a slightly positive hydrogen on one molecule and a slightly negative atom on another molecule.

Hope it helps ;)

8 0
3 years ago
Read 2 more answers
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