You dissolve 2.83g of HBr in 2.68L of water. What would be the pH of the resulting solution

28 Which of the following compounds contains a transition metal? A. magnesium bromide (MgBr2) B. sodium chloride (NaCl) C. potas

kari74 [83]

D iron oxide Fe is a transition metal

3 0

3 years ago

How many carbons are present in the hydrocarbon 3-ethyl-2,3,4-trimethylpentane

fiasKO [112]

I would say there is 10 (2 in the ethyl group, 3 in the three methyl groups and 5 in the pent chain)

4 0

3 years ago

Which of the following is a helpful addition to your observations?

Pavlova-9 [17]

The answer to that question would be C

3 0

3 years ago

Hydrogen is 99% 1H, 0.8% 2H, and 0.2% 3H. Calculate its average atomic mass.

AlekseyPX

The average atomic mass of hydrogen (99% H-1, 0.8% H-2, and 0.2% H-3) is 1.012 amu.

The average atomic mass of hydrogen can be calculated with the following equation:

$A = m_{H-1}\%_{H-1} + m_{H-2}\%_{H-2} + m_{H-3}\%_{H-3}$

Where:

$m_{H-1}$ : is the mass of protium (H-1) = 1

$m_{H-2}$ : is the mass of deuterium (H-2) = 2

$m_{H-3}$ : is the mass of tritium (H-3) = 3

$\%_{H-1}$ : is the abundance percent of H-1 = 99%

$\%_{H-2}$ : is the abundance percent of H-2 = 0.8%

$\%_{H-3}$ : is the abundance percent of H-3 = 0.2%

The average atomic mass is:

$A = 1*99\% + 2*0.8\% + 3*0.2\%$

Changing all the percent values into decimal ones, we have:

$A = 0.99 + 2*0.008 + 3*0.002 = 1.012$

Therefore, the average atomic mass of hydrogen is 1.012 amu.

Learn more about average atomic mass here brainly.com/question/8575403?referrer=searchResults

I hope it helps you!

6 0

2 years ago

) In order to plate a steel part having a surface area of 200 in.2 with a 0.002 in.-thick layer of nickel: (a) how many atoms of

Fiesta28 [93]

Answer:

(a). 5.4 × 10^23 atoms.

(b). 0.8928 moles Ni.

Explanation:

The first thing to do is to convert surface area from the in^2 to cm^2 and also the thickness unit to cm.

Therefore, 200 in^2 = 1290.3 cm^2 and 0.002 in = 0.00508 cm.

The next thing to do is to calculate the volume by using the formula below;

Volume= A × d. Where A = area and d = thickness.

Then, volume = 1290.3 × 0.00508= 6.55 cm^3.

Although not given but the Density if Nickel = 8 g/cm^3.

We know that the formula for Calculating density = mass / volume. So, we have ; mass = density × volume.

Mass= 8 × 6.55 = 52.4 g.

(a). The number of atoms of Nickel= moles × Avogrado's number.

Numbers of moles= mass / molar mass.

==> 52.4 / 58.6934 = 0.8928 moles.

Then, the number of atoms of Nickel = 0.8928 × 6.02 × 10^23.

= 5.4 × 10^23 atoms.

(b). The number of moles of Nickel has been Calculated in (a) above to be = 0.8928 moles Ni.

5 0

4 years ago

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