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3 years ago

Pleaze help im gonna fail this semester

2 answers:

7 0

when hydrogen peroxide mixed with vinegar makes peracetic which is potentially toxic and irritate skin, eyes and respiratory system.

alexandr1967 [171]3 years ago

3 0

Hydrogen peroxide mixed with vinegar makes peracetic acid, which is a toxic gas that irritates the skin and respiratory system

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1220 pounds / 1.45 inches =? What do you get when you quadruple 22.34 cm?

Brilliant_brown [7]

(a) 841 lb/in; (b) 89.36 cm

(a) 1220 lb/1.45 in = 841 lb/in

(b) To quadruple a measurement is to multiply it by 4.

∴ 4 × 22.34 cm = 89.36 cm

8 0

4 years ago

Find percent yield:

saveliy_v [14]

Answer: The percent yield of the reaction is 91.8 %

Explanation:

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

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$ .....(1)

For $B_5H_9$ :

Given mass of $B_5H_9$ = 4.0 g

Molar mass of $B_5H_9$ = 63.12 g/mol

Putting values in equation 1, we get:

$\text{Moles of }B_5H_9=\frac{4g}{63.12g/mol}=0.0634mol$

For oxygen gas:

Given mass of oxygen gas = 10.0 g

Molar mass of oxygen gas = 32 g/mol

Putting values in equation 1, we get:

$\text{Moles of oxygen gas}=\frac{10g}{32g/mol}=0.3125mol$

The chemical equation for the reaction of $B_5H_9$ and oxygen gas follows:

$2B_5H_9+12O_2\rightarrow 5B_2O_3+9H_2O$

By Stoichiometry of the reaction:

12 moles of oxygen gas reacts with 2 moles of $B_2H_5$

So, 0.3125 moles of oxygen gas will react with = $\frac{2}{12}\times 0.3125=0.052mol$ of $B_2H_5$

As, given amount of $B_2H_5$ is more than the required amount. So, it is considered as an excess reagent.

Thus, oxygen gas is considered as a limiting reagent because it limits the formation of product.

By Stoichiometry of the reaction:

12 moles of oxygen gas produces 5 moles of $B_2O_3$

So, 0.3125 moles of oxygen gas will produce = $\frac{5}{12}\times 0.3125=0.130moles$ of water

Now, calculating the mass of $B_2O_3$ from equation 1, we get:

Molar mass of $B_2O_3$ = 69.93 g/mol

Moles of $B_2O_3$ = 0.130 moles

Putting values in equation 1, we get:

$0.130mol=\frac{\text{Mass of }B_2O_3}{69.63g/mol}\\\\\text{Mass of }B_2O_3=(0.130mol\times 69.63g/mol)=9.052g$

To calculate the percentage yield of $B_2O_3$ , we use the equation:

$\%\text{ yield}=\frac{\text{Experimental yield}}{\text{Theoretical yield}}\times 100$

Experimental yield of $B_2O_3$ = 8.32 g

Theoretical yield of $B_2O_3$ = 9.052 g

Putting values in above equation, we get:

$\%\text{ yield of }B_2O_3=\frac{8.32g}{9.052g}\times 100\\\\\% \text{yield of }B_2O_3=91.8\%$

Hence, the percent yield of the reaction is 91.8 %

6 0

4 years ago

Hydrogen H 2. helium Mg 3. sodium K 4. magnesium He 5. potassium Na

ira [324]

umm. what's your question? i'll answer it cause these r just the elements...

4 0

3 years ago

What is a force, provide an example

alexandr1967 [171]

Answer:

A force involves an interaction between two or more objects, and it causes a push or pull between the objects. ... Good examples of opposing force include drag due to interaction with an air mass and the force due to friction between two objects.

6 0

3 years ago

Carbon becomes a part of the ground soil when:

I am Lyosha [343]

I would say
A. Living things decay
Because when living things break down/decay, it becomes a nutrient for the soil like a fertilizer. B is wrong because although plants is a living thing, humans is also, but they don’t go through photosynthesis, which is transforming sunlight into food. C is wrong because runoff enters the nearby bodies of water, this is just water coming down (like raining, snowing, hailing) somewhere into the runoff to go into the nearby bodies of water and goes over the same water cycle over and over again. Although bacteria does convert carbon in the air (D) and form the plant host can use, but it’s part of the ground soil, so it’s not D.

6 0

3 years ago