# Questions tagged [significant-figures]

For questions regarding the digits of a number used to express it to a particular degree of accuracy.

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### Number of significant figures to use in reporting the concentration of the titrand in acid-base titration [closed]

If you perform an acid-base titration yourself, how do you determine the number of significant figures to use when reporting on the concentration of the titrand? Assume you perform seven titration ...
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### Should durations of time be considered to determine final significant figures of answer?

In preparation for AP Chemistry this upcoming semester I've been assigned a number of challenge problems. One of them is as following: Suppose that polluted air has carbon monoxide $(\ce{CO})$ levels ...
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### How do mathematical operations involving exact numbers affect significant figures? [duplicate]

I'm asking for assurance that I'm not making any mistakes because I can't find these rules explicitly stated in my textbook or elsewhere, but it seems to me that: When multiplying/dividing a measured ...
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### What's the purpose of significant figures in measurements?

I have read about significant figures in my chemistry and physics books, but none of them pointed out the significance of the significant figures. Searching the Internet I found two possible answers: ...
1 vote
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### Significant figures in a calculation of atomic mass from isotopic abundance

I had this question: Naturally occurring europium consists of two isotopes with a mass of 151 and 153. Europium-151 has an abundance of 48.030 and, and europium-153 has a natural abundance of 51.970. ...
1 vote
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### Is precision measured by significant digits in chemistry?

I was recently asked this question: An experiment is done 3 times, with a different measuring tool used for each time. The results of the experiment are 1.39, 0.9, and 1.0 (all centimeters). Which ...
63 views

### I need help checking to see if the answer I got is correct answer [closed]

My professor says that the answer is 583.5g. I got 583.0330822g. She says to use her periodic table. Her periodic table says the mass of Ag: 107.87g, N: 14.01g, O: 16.00g, and S: 32.06g. Below is the ...
321 views

### Measuring instruments and significant figures

To start with, I am familiar with the rules that we have for sig-figs. I have two chemistry books by different authors (One by McMurry and the other one by Nivaldo J Tro). I was doing some casual ...
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### Which is more precise? 328.4 or 0.0008? [closed]

What is more precise? 328.4 or 0.0008? I want to know if precision is based on the number of significant figures or the number of places past the decimal?
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### Why do significant figure rules contradict each other? [duplicate]

So I came across a problem in my chemistry textbook that brought up another question. The problem had to do with calculating the mass% composition of chlorine in a certain molecule. So to go about ...
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### What is a reliable way of writing significant figures in multi-step problems? [closed]

I understand the sig fig rules that pertain to addition and multiplication problems, however, in multi-step problems, I have not been able to find a systematic approach to getting the right amount. ...
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### Significant figures and uncertainty [closed]

A narrow-necked volumetric flask with a capacity of 200mL has an uncertainty of ±0.150mL so should the number of significant figures after the decimal point in my final answer be three or two?
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### Division, multiplication, addition and subtraction of significant figures [closed]

$1.$After adding two or more numbers, the number of digits after the decimal in the result=Least no. of digits after the decimal in the numbers being added. $2.$After multilplying two numbers, no. of ...
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### Significant figures of the product [closed]

How is $$\frac{8.925 − 8.904}{8.925} × 100 = 0.24?$$ When I solved I got $$\frac{0.021}{8.925} × 100$$ Now it will have to be $2$ significant numbers $(0.021)$ time $1$ significant number $(100)$ ...
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### A sample must not contain more than 2% contaminants to be pure. Are there instances where 2.12% is ok?

I do not have any background in chemistry, I am asking this on behalf of someone else, twice translated, so I really hope it makes sense. "A maximum of 2%" seems quite a clear specification, but ...
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### How many sig figs should go after this calculation? [closed]

How many significant figures should be reported in the answer to the calculation (Assume all numbers are experimentally determined). $\frac{12.501 \times 3.52}{0.0042}+6.044$ I tried to do this ...
1 vote
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### How to get a precise answer to a textbook precipitation problem?

This question concerns a textbook problem* on precipitation. Briefly, there are $2\cdot10^{-4}$ of Mn$^{2+}$ and Cu$^{2+}$ ions in a liter of solution with $0.003$ M HClO$_4$. This solution is then ...
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### Significant Figures Calculations and Precise Instruments [closed]

I understand the rules for significant figures and how to read instruments, except for one thing. I was told that our digital scale is particularly precise to the 1,000ths decimal place. So in ...
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### Significant figures in percent error calculation?

Consider a percent error calculation where the measured value has 1 significant figure (XmL), and the actual/true value has 3 significant figures (0.XXXmL). Typically I would think that the percent ...
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### How do significant figures work on this computation?

This isn't a homework question although it may seem like one. We've never really discussed significant figures and it was just introduced to us when we were learning how to solve word problems ...
1 vote
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### Why should you round to proper significant figures after you complete a calculation rather than while doing the calculation?

In class, my teacher mentioned that you should complete a calculation without considering significant figures and then at the very end, round to the proper number of significant figures. Why couldn't ...
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### Significant Figures

I recently did my first chemistry lab where we had to find the average mass of our aluminum cylinder. We were required to weigh and record its mass 3 times using an electric balance which gave us a ...
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### Significant Figures Calculations

I am confused regarding significant figures. Consider "Calculate the volume of 2.8 kg of liquid with density of 1.11 g/cm^3" Then, Volume = 2.8 kg * (cm^3 / 1.11 g) = 2522.522 (where 522 is recurring)...
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### Does the addition or multiplication rule have precedence deciding the significant figures in 5×5.364? [duplicate]

How many significant figures should be present in the answer of $5\times 5.364$? Addition rule: The result cannot have more digits to the right of the decimal point than either of the original ... 1 vote
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### When expressing a quantity, do the non-significant figures determine whether you round up the last significant figure?

I had thought that the non significant figures determined whether the least significant figure was to be rounded up. For example, given the number $9.1145$, if the number is to be expressed as three ...
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### How to round significant figures correctly?

Calculate how many grams of p-nitrophenol are required to prepare $\pu{250 mL}$ of a $\pu{11 mM}$ solution. (Answer to 3 significant figures.) I worked it out as \begin{align} \frac{250}{1000}\,\...