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Kamila [148]
4 years ago
13

2. When multiplying or dividing measured numbers, we use the measurement with the least number of

Chemistry
1 answer:
Goryan [66]4 years ago
4 0

Answer:

a. 105

b. 76.4

c. 0.04

d. 4.000

Explanation:

Question a. has three significant figures

Question b. has three significant figures

Question c. has one significant digit (only the 3 is significant in the question, zeros are only significant if they are trailing with the presence of a decimal point or in between two non-zero numbers)

Question d. has four significant figures

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What is the symbol (including the atomic number, mass number, and element symbol) for the nitrogen isotope with 8 neutrons? Expr
Doss [256]

Answer: The isotope is represented as _7^{15}\textrm{N}

Explanation:

General representation of an element is given as:_Z^A\textrm{X}

where,

Z represents Atomic number

A represents Mass number

X represents the symbol of an element

Atomic number is defined as the number of protons or number of electrons that are present in an atom.

Atomic number = Number of electrons = Number of protons  = 7 (for nitrogen)

Mass number is defined as the sum of number of protons and neutrons that are present in an atom.

Mass number = Number of protons + Number of neutrons = 7+8 = 15

Thus the isotope is represented as _7^{15}\textrm{N}

5 0
3 years ago
19. What is the most significant factor that controls the development of soil?
Nady [450]
<span>The most significant factor that controls the development of soil is B. climate. Depending on what the climate and the weather are like in a particular area, the soil will be either developed and healthy and fertile, or it won't if the conditions are too harsh. If the weather is nice, usually the soil will form which will be suitable for crops and agriculture, but if it's too hot or too cold, the soil won't be used for such things as it won't be fertile.</span>
8 0
4 years ago
What is the volume of a balloon containing 0.75 moles of gas at STP?
disa [49]

Answer:

V = 16.81 L

Explanation:

Given data:

Number of moles = 0.75 mol

Temperature = standard = 273 K

Pressure = 1 atm

Volume of balloon = ?

Solution:

The given problem will be solve by using general gas equation,

PV = nRT

P= Pressure

V = volume

n = number of moles

R = general gas constant = 0.0821 atm.L/ mol.K  

T = temperature in kelvin

Now we will rearrange the formula.

V = nRT/P

V = 0.75 mol ×0.0821 atm.L/mol.K ×273 K / 1 atm

V = 16.81 atm.L/ 1 atm

V = 16.81 L

6 0
3 years ago
First person with the right answer gets brainliest thanks (btw the numbers on the right are the answers choose the right one)
kap26 [50]
Molar mass of FE2O3=2(55.85)+3(16)=159.7

2.56g*1mol/159.7*2mol/1mol*55.85g/1mol=1.79g
6 0
3 years ago
What is the chemical name of the compound
disa [49]
A.) ammonium thiocyanate
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2 years ago
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