All categories

2 years ago

What percent of magnesium bromide, MgBr2, is magnesium?

1 answer:

7 0

First, we need to calculate the molar mass of the whole compound by adding the masses of each atom from the periodic table.

Mg= 24.3 g/mol
Br= 80.0 g/mol

molar mass MgBr2= 24.3 + 2 x 80.0= 184.3 g/mol

to find the percent of magnesium doing "parts over the whole"
the mass of magnesium over the total mass. then times 100 because it is a percentage value

24.3/184.3x 100= 13.2%

You might be interested in

If 6.96 mol of C 5 H 12 reacts with excess O 2 , how many moles of CO 2 will be produced by the following combustion reaction? C

kati45 [8]

Answer:

34.8 moles of CO₂ are produced

Explanation:

This is the reaction:

1C₅H₁₂ + 8O₂ → 6H₂O + 5CO₂

Ratio is 1:5. We make a rule of three

1 mol of pentane can produce 5 moles of CO₂

Then, 6.96 moles of pentane may produce (6.96 .5) / 1 = 34.8 moles

7 0

3 years ago

Who finna talkkkk????????????????????

FrozenT [24]

Answer: Not me

Explanation:

Not me

5 0

2 years ago

A possible mechanism for the gas phase reaction of NO and H2 is as follows: Step 1 2NO N2O2 Step 2 N2O2 + H2 N2O + H2O Step 3 N2

mel-nik [20]

Answer: Option (d) is the correct answer.

Explanation:

Steps involved for the given reaction will be as follows.

Step 1: $2NO \Leftrightarrow N_{2}O_{2}$ (fast)

Rate expression for step 1 is as follows.

Rate = k $[NO]^{2}$

Step 2: $N_{2}O_{2} + H_{2} \rightarrow N_{2}O + H_{2}O$

This step 2 is a slow step. Hence, it is a rate determining step.

Step 3. $N_{2}O + H_{2} \rightarrow N_{2} + H_{2}O$ (fast)

Here, $N_{2}O_{2}$ is intermediate in nature.

All the steps are bimolecular and it is a second order reaction. Also, there is no catalyst present in this reaction.

Thus, we can conclude that the statement step 1 is the rate determining step, concerning this mechanism is not directly supported by the information provided.

4 0

2 years ago

What are the three types of nuclear particles emitted when a radioactive atom decay?

Alenkasestr [34]

Alpha, Beta, and Gamma Decay

4 0

3 years ago

Read 2 more answers

Use the equation: 2Mg + O2→ 2MgO

ludmilkaskok [199]

Answer:

3 moles of O2 needed

Explanation:

2 moles of Mg to one mole O2

so 3 moles of O2 needed

6 0

1 year ago