Ions stick together with<br> A . Covalent bonds <br> B. Negative bonds<br> C. Ionic bonds

A polyatomic ion contains 18 protons and 20 electrons. the net charge if this ion is ___?

andrew11 [14]

-2 cuz 20 negative minus 18 positive is -2

6 0

1 year ago

2Al(s) + 3H2SO4(aq) → Al2(SO4)3(aq) + 3H2(g)a. Determine the volume (mL) of 15.0 M sulfuric acid needed to react with 45.0 g of

Ira Lisetskai [31]

Answer:

a. 167 mL.

b. 39.3 %.

Explanation:

Hello!

In this case, for the undergoing chemical reaction, since 45.0 g of aluminum react, based on the 2:3 mole ratio with sulfuric acid, we can compute the required moles as shown below:

$n_{H_2SO_4}=45.0gAl*\frac{1molAl}{27.0gAl} *\frac{3molH_2SO_4}{2molAl} =2.50molH_2SO_4$

Next, since the molarity of a solution is computed based on the moles and volume (M=n/V), we can compute the required volume of sulfuric acid as shown below:

$V=\frac{n}{M}=\frac{2.50mol}{15.0mol/L}=0.167L$

That in mL is 167 mL.

Moreover, for the percent yield, we compute the grams of aluminum sulfate that are produced based on the required 2.50 moles of sulfuric acid:

$m_{Al_2(SO_4)_3}=2.50molH_2SO_4*\frac{1molAl_2(SO_4)_3}{3molH_2SO_4}*\frac{342.15gAl_2(SO_4)_3}{1molAl_2(SO_4)_3} \\\\m_{Al_2(SO_4)_3}=285.13gAl_2(SO_4)_3$

Therefore the percent yield is:

$Y=\frac{112g}{285.13g}*100\%\\\\Y=39.3\%$

Best regards!

6 0

2 years ago

Classify the following specific inhibitors or inhibitor characteristics according to one of three types of inhibition: reversibl

Paraphin [41]

Answer:

A inhibitor structure resembles substrate structure B inhibitor binds non covalently at site other than active site.C inhibitors bind covalently and permanently at active site.

Explanation:

A Reversible competitive inhibitors structurally resembles the substrate and competes with the substrate to bind to the active site of the target enzyme.

B Reversible noncompetitive inhibitors binds no covalently at site of the target enzyme that is different from the active site.

C irreversible inhibitors interacts very tightly to the active site of an enzyme by covalent bond which cannot be overcome.

5 0

3 years ago

Use the following terms to complete the concept map below: South America Pangaea North America Laurasia Gondwana

mario62 [17]

You need to add the map thing

4 0

3 years ago

Read 2 more answers

What is the difference between mass number and atomic number?

astra-53 [7]

Answer:

They are found the same way but use different symbols when found.

Explanation:

3 0

2 years ago

Ions stick together with A . Covalent bonds B. Negative bonds C. Ionic bonds