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Mila [183]
4 years ago
11

How many protons are in an atom of strontium?

Chemistry
1 answer:
Stells [14]4 years ago
7 0

Answer:

38

Explanation:

Symbol: Sr

Atomic mass: 87.62 u

Electrons per shell: 2,8,18,8,2

Atomic number: 38

Electron configuration: [Kr] 5s2

Van der Waals radius: 255 pm

Valence electrons: two

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What is the limiting reactant and theoretical yield if 0.483 mol of Ti and 0.911 mol Clare used in this reaction: Ti + 2Cl2 → Ti
Mariana [72]

Answer : The limiting reactant is Cl_2 and the theoretical yield will be 86.45 grams.

Explanation : Given,

Moles of Ti = 0.483 mole

Moles of Cl_2 = 0.911 mole

Molar mass of TiCl_4 = 190 g/mole

First we have to calculate the limiting and excess reagent.

The given balanced chemical reaction is,

Ti+2Cl_2\rightarrow TiCl_4

From the balanced reaction we conclude that

As, 2 moles of Cl_2 react with 1 mole of Ti

So, 0.911 moles of Cl_2 react with \frac{0.911}{2}=0.455 moles of Ti

From this we conclude that, Ti is an excess reagent because the given moles are greater than the required moles and Cl_2 is a limiting reagent and it limits the formation of product.

Now we have to calculate the moles of TiCl_4.

As, 2 moles of Cl_2 react to give 1 moles of TiCl_4

So, 0.911 moles of Cl_2 react to give \frac{0.911}{2}=0.455 moles of TiCl_4

Now we have to calculate the mass of TiCl_4.

\text{Mass of }TiCl_4=\text{Moles of }TiCl_4\times \text{Molar mass of }TiCl_4

\text{Mass of }TiCl_4=(0.455mole)\times (190g/mole)=86.45g

Therefore, the theoretical yield will be 86.45 grams.

4 0
3 years ago
Please help me! I put the max brainly points!
Diano4ka-milaya [45]

Answer:

579 mL, .96 kPa, 34.21 c

Explanation:

8 0
3 years ago
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Elements placed in the same group have similar chemical properties. Which one of the following has different chemical property?
Westkost [7]

Answer:

Na has the different chemical property

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3 years ago
What are anibiotcs made of<br>just interested
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Answer:

please mark as brainliest

Explanation:

Any substance that inhibits the growth and replication of a bacterium or kills it outright can be called an antibiotic. Antibiotics are a type of antimicrobial designed to target bacterial infections within (or on) the body. This makes antibiotics subtly different from the other main kinds of antimicrobials widely used today:

Antiseptics are used to sterilise surfaces of living tissue when the risk of infection is high, such as during surgery.

Disinfectants are non-selective antimicrobials, killing a wide range of micro-organisms including bacteria. They are used on non-living surfaces, for example in hospitals.

Of course, bacteria are not the only microbes that can be harmful to us. Fungi and viruses can also be a danger to humans, and they are targeted by antifungals and antivirals, respectively. Only substances that target bacteria are called antibiotics, while the name antimicrobial is an umbrella term for anything that inhibits or kills microbial cells including antibiotics, antifungals, antivirals and chemicals such as antiseptics.

Most antibiotics used today are produced in laboratories, but they are often based on compounds scientists have found in nature. Some microbes, for example, produce substances specifically to kill other nearby bacteria in order to gain an advantage when competing for food, water or other limited resources. However, some microbes only produce antibiotics in the laboratory

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Which of the following is made up only of one type of atom?
erastova [34]

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