Chemistry College

The molar mass of gallium (Ga) is 69.72 g/mol.
Calculate the number of atoms in a 27.2 mg sample of Ga.
Write your answer in scientific notation using three significant figures.
atoms Ga

Answers

Answer 1

Answer:

2.35 x 10²⁰ atoms Ga

Explanation:

After converting from mg to g, use the molar mass as the unit converter to convert to moles. Then using Avogadro's number, 6.022 x 10²³ convert from moles to atoms of Ga.

[tex]27.2mgGa*\frac{1g}{1000mg} *\frac{1 mol Ga}{69.72gGa} *\frac{6.022*10^2^3 atoms Ga}{1 molGa} = 2.349 * 10^2^0 atoms Ga[/tex]

Then round to 3 significant figures = 2.35 x 10²⁰ atoms Ga.

Answer 2

The number of atoms in 27.2 mg sample of Ga is 2.35 × 10²⁰ atoms

Stoichiometry

From the question, we are to calculate the number of atoms in a 27.2 mg sample of Ga.

First, we will determine the number of moles of Ga present

Using the formula,

[tex]Number\ of\ moles = \frac{Mass}{Molar\ mass} [/tex]

Mass = 27.2 mg = 0.0272 g

Molar mass = 69.72 g/mol

Then,

[tex]Number\ of\ moles \ of\ Ga = \frac{0.0272}{69.72} [/tex]

[tex]Number\ of\ moles \ of\ Ga = [/tex] 0.000390132 moles

Now, for the number of atoms present

From the formula

Number of atoms = Number of moles × Avogadro's constant

Then,

Number of Ga atoms = 0.000390132 × 6.022×10²³

Number of Ga atoms = 2.35 × 10²⁰ atoms

Hence, the number of atoms in 27.2 mg sample of Ga is 2.35 × 10²⁰ atoms

Learn more on stoichiometry here: https://brainly.com/question/14464650

Related Questions

In the laboratory you dissolve 18.7 g of copper(II) bromide in a volumetric flask and add water to a total volume of 375mL.

Required:
a. What is the molarity of the solution?
b. What is the concentration of the copper(II) cation?
c. What is the concentration of the acetate anion?

Answers

Answer:

a) - 0.2 M

b) - 0.2 M

c)- 0

Explanation:

The chemical formula of copper (II) bromide is CuBr₂. Its molar mass (MM) is calculated as follows:

MM(CuBr₂)= MM(Cu) + (2 x MM(Br) = 63.5 g/mol + (2 x 80 g/mol)= 223.5 g/mol

a). Molarity = moles CuBr₂/1 L solution

moles CuBr₂ = mass/MM = 18.7 g x 1 mol/223.5 g = 0.084 mol

Volume in L = 375 mL x 1 L/1000 mL = 0.375 L

M = 0.084 mol/(0.375 L) = 0.223 M ≅ 0.2 M

b). When is added to water, CuBr₂ dissociates into ions as follows:

CuBr₂ ⇒ Cu²⁺ + 2 Br⁻

We have 1 mol Cu²⁺ (copper (II) cation) per mol of CuBr₂. Thus, the concentration of copper (II) cation is:

0.2 mol CuBr₂ x 1 mol Cu²⁺/mol CuBr₂ = 0.2 M

c). The concentration of acetate anion is 0. There is no acetate anion in the solution (the anion from CuBr₂ is bromide Br⁻).

Solid diarsenic trioxide reacts with fluorine gas (F2) to produce liquid arsenic pentafluoride and oxygen gas (O2). Write the Qc for this reaction.

Answers

Answer:

QC= [O2]^3/[F2]^10

Explanation:


1. What 2 subatomic particles have charges? List the particle name and its charge.

Answers

Answer: Proton - positive charge (+)

Neutron - neutral charge (0)

Electron - negative charge (-)

Explanation:

Other Questions
Non example of complex fraction. what are the mood of the religous songs The specific The specific identification inventory costing method: Select one: A. Measures the ending inventory at the actual prices of the specific units sold during the period B. Is more appropriate for a firm selling construction equipment than for a firm selling greeting cards C. Is not a generally accepted method of pricing inventories D. Uses expected future acquisition costs rather than historical costs to measure the ending inventoryinventory costing method: Solid diarsenic trioxide reacts with fluorine gas (F2) to produce liquid arsenic pentafluoride and oxygen gas (O2). Write the Qc for this reaction. What is the approximate diameter of the Zika virus? The Question is Below; Mamie Clark was a psychologist who is known for her research on __________. A. intellectual and developmental disabilities and gifted children B. racism and its adverse effects on child development C. identity development among Asians living in the US D. academic development of children in desegregated schools 3xsquared +13x-10HELPP PLEASE What is the quotient of -32/8? Hygiene is a part of? In what way was it difficult to amend the Articles of Confederation? the first 5 multiples of 18 after 0 are? Source: Hadith, collection of sayings of the Prophet Muhammad"The Prophet said: 'Seek knowledge even in China."The teaching above best explains which historical development in the Islamicworld?A. The sponsorship of innovation and exchange in Dar al-Islam.OB. The establishment of universal education in Islamic states.c. Islamic scholars were prevented from studying subjects not mentioned in theHadithD. Arabic unified Dar al-Islam as the sole language of the Quran. 1. What African country was the site of colonization efforts for freed slaves?neitherbothSierra LeoneLiberia2. What compromise had a strong Fugitive Slave Law added to it?Missouri CompromiseKansas Nebraska ActCompromise of 1850Bleeding Kansas3.Which describes northern soil?productive lush soilrocky poor soilclay based soilfertile rich soil4. Which group caused Georgians to fear for the end of slavery?small farmersabolitionistssecessionistsplantation owners5.Why did the north have to use immigrant labor in the factories?Cheap western lands had attracted northerners.Disease caused many workers to die.Those in the north refused to work in the factories.War had killed much of the population. The process of photosynthesis requires the starting materials In the laboratory you dissolve 18.7 g of copper(II) bromide in a volumetric flask and add water to a total volume of 375mL. Required:a. What is the molarity of the solution?b. What is the concentration of the copper(II) cation?c. What is the concentration of the acetate anion? A rectangular table top needs to be divided into six equal sections. Suppose that you are only able to determine the halfway mark between any interval. Explain how you would use these benchmarks to estimate 1/6 of the length of the table top. A music player app has 2 gigabytes of storage and can hold about 500 songs. A similar, but larger app has 80gigabytes of storage. About how many songs can the larger app hold? 12. ROSCALCULATE THE ARCLENGTH. ROUND TO THENEAREST TENTH.18063 11IQS 4(3x + 1)What is the answer to 4(3x + 1)