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Olin [163]
3 years ago
9

Please tell me the answer I will mark you brainliest

Chemistry
2 answers:
Shkiper50 [21]3 years ago
8 0

Answer:

3

Explanation:

third answer might be right

kap26 [50]3 years ago
6 0

Answer:

Answer is the third one

Explanation:

All living organisms are made up of one or more cells, which are considered the fundamental units of life. Even unicellular organisms are complex! Inside each cell, atoms make up molecules, which make up cell organelles and structures.

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What is the difference between measured and accepted value? And how are these values used to determine the precision of these va
serg [7]
Measured values are verified and go under a series of experiments before being accepted as the norm. Accepted values are unanimously accepted values, seen as the norm by a qualified group of individuals (scientists or the people of the intellectual sphere).
7 0
3 years ago
Read 2 more answers
How many moles are in 3.45 g of Na2O?Round your answer to three significant
Neporo4naja [7]

Answer: There are 0.056 moles present in 3.45 g of Na_{2}O.

Explanation:

Given : Mass = 3.45 g

Moles is the mass of substance divided by its molar mass.

Hence, moles of Na_{2}O (molar mass = 61.98 g/mol) is as follows.

Moles = \frac{mass}{molar mass}\\= \frac{3.45 g}{61.98 g/mol}\\= 0.056 mol

Thus, we can conclude that there are 0.056 moles present in 3.45 g of Na_{2}O.

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3 years ago
What 2 energy resources do not rely on photosynthesis
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The sun i believe is one and wind
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3 years ago
Perform the following
Zarrin [17]

This problem is providing a mathematical expression which the result should be expressed with the correct significant figures. At the end, the result is 1209.0 because of the following:

<h3>Significant figures:</h3>

In science, the use of significant figures is crucial as long numbers are not necessarily required when reporting a numerical value, for that reason the importance of reporting measurements with the correct number of significant figures.

In the case of additions, we perform the normal operation as the first step:

1204.2 +4.79613 = 1208.99613

Next, we round the result to the least number of decimal places, in this case one because 1204.2 has just one decimal place, unlike the 4.79613 which has five, so that we round the 8 up to 9 and leave a 0 as the only decimal place:

1209.0

Learn more about significant figures: brainly.com/question/11904364

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