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3 years ago

3. Define isobar 75 points

Chemistry

1 answer:

steposvetlana [31]3 years ago

5 0

Answer:

meteorology A line drawn on a map or chart connecting places of equal or constant pressure.

nuclear physics Either of two nuclides of different elements having the same mass number.

thermodynamics A set of points or conditions at constant pressure.

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HELP ME OUT PLEASE!! I NEED HELP !

lisov135 [29]

It’s b secondary sector

4 0

3 years ago

For the chemical reaction, 2HCl + Ca(OH)2 ➡️ CaCl2 + 2H2O what mass of calcium hydroxide in grams is needed to produce 3.63 mol

wlad13 [49]

Answer:

2HCl (aq) + Ca

(

)

(aq) ---------> Ca

(ppt) + 2

O (aq)

let us calculate the number of moles , as per the chemical reactions;

2 moles of HCl solution reacts with one mole Calcium Hydroxide

(

)

One mole of HCl has mass : 36.5 g/mol, two moles of HCl will have mass, 73 g.

One mole of Ca

(

)

has mass 74.1 g

as per equation; 73 g of HCl reacts with 74.1 g of Ca

(

)

1g of HCl reacts with 74.1g / 73 of Ca

(

)

1g of HCl reacts with 1.015 g of Ca

(

)

NOW AS PER THE QUESTION MOLARITY AND VOLUME OF HYDROCHLORIC ACID IS GIVEN, IT CAN BE USED TO CALCULATE THE MASS OF HYDROCHLORIC ACID IN THE SOLUTION.

NUMBER OF MOLES of HCl ; Molarity of solution x Volume of Solution

# of moles of HCl = (0.40 mol/L ) x 350 mL

= (0.40 mol/L ) x 0.350 L = 0.14 mol

mass of HCl that makes 0.14 mol of HCl = # of moles x molar mass of HCl

mass of HCl = 0.14 mol x 36.5 g/ mol

mass of HCl = 5.11g

As per Stoichiometry , 1g of HCl reacts with 1.015 g of Ca

(

)

, 5.11g of HCl can react with 5.11 x 1.015 = 5.1865 g or 5.2 g of

(

)

5 0

3 years ago

Oxalic acid can remove rust (Fe2O3) caused by bathtub rings according to the reaction Fe2O3(s) - 6H2C2O4(aq) rightarrow 2Fe(C2O4

Katena32 [7]

Answer: The mass of rust that can be removed is 1.597 grams

Explanation:

To calculate the number of moles for given molarity, we use the equation:

$\text{Molarity of the solution}=\frac{\text{Moles of solute}}{\text{Volume of solution (in L)}}$ .....(1)

Molarity of oxalic acid solution = 0.1255 M

Volume of solution = $6.00\times 10^2mL$ = 600 mL = 0.600 L (Conversion factor: 1 L = 1000 mL)

Putting values in equation 1, we get:

$0.100M=\frac{\text{Moles of oxalic acid}}{0.600L}\\\\\text{Moles of oxalic acid}=(0.100mol/L\times 0.600L)=0.06mol$

For the given chemical reaction:

$Fe_2O_3(s)+6H_2C_2O_4(aq.)\rightarrow 2Fe(C_2O_4)_3^{3-}(aq.)+3H_2O(l)+6H^+(aq.)$

By Stoichiometry of the reaction:

6 moles of oxalic acid reacts with 1 mole of ferric oxide (rust)

So, 0.06 moles of oxalic acid will react with = $\frac{1}{6}\times 0.06=0.01mol$ of ferric oxide (rust)

To calculate the mass of rust for given number of moles, we use the equation:

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

Molar mass of rust (ferric oxide) = 159.7 g/mol

Moles of rust = 0.01 moles

Putting values in above equation, we get:

$0.01mol=\frac{\text{Mass of rust}}{159.7g/mol}\\\\\text{Mass of rust}=(0.01mol\times 159.7g/mol)=1.597g$

Hence, the mass of rust that can be removed is 1.597 grams

5 0

3 years ago

If the first energy level can hold 2 electrons, the second holds 8, and the third can hold 8, what if the atomic number is bigge

sergejj [24]

You're wrong because the third energy level can contain 18 electrons. And the 4th have up to 32 elections.

The pattern go by 2-8-18-32

4 0

3 years ago

What does the data mean for people involved in farming and agriculture?

posledela

Answer:

ummmmmmmmmmmmmmmm

Explanation:

6 0

2 years ago