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How many significant figures are justified in a measurement of a length that is between 9 and 10 centimeters if the measuring device ruler has smallest divisions of 0.1 cm?
Wiki User
∙ 12y ago
You would need to record to the 0.1 cm, then estimate the next significant figure. So you should have a measurement to the 0.01 cm.
Wiki User
∙ 12y ago
Two significant figures are justified in this measurement. Since the measuring device ruler has smallest divisions of 0.1 cm, the uncertainty lies in the last digit. The measurement falls between 9.0 cm and 10.0 cm, so the two digits, 9 and 0, are significant.
Wiki User
∙ 6y agoTwo significant figures is enough.
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What is the mass of 2.47 moles of fluorine atoms?
The gram atomic mass of fluorine is 18.9984. Therefore, the mass of 2.47 moles is 2.47 times the gram atomic mass, or about 46.9 grams, to the justified number of significant digits.
When you have 46 grams of sodium react with 160 grams of oxygen how many moles of sodium oxide are obtained?
The equation for the reaction is 4 Na + O2 -> 2 Na2O. This shows that, for complete reaction, one mole of oxygen is required for each four gram atomic masses of sodium. The gram atomic mass of sodium is 22.9898; therefore, 46 grams of sodium constitutes 2.00 moles of sodium, to more than the justified number of significant digits. The gram molecular mass of diatomic oxygen is 31.9988; therefore 160 grams of oxygen constitutes 5.000 moles of diatomic oxygen, to more than the justified number of significant digits. This is well over the minimum amount of oxygen required for complete reaction of all the sodium present. Each two gram atomic masses of sodium produces one gram formula mass of sodium oxide; therefore, the number of gram formula masses of sodium oxide produced is 1.00, to at least the justified number of significant digits.
What is the normality of the solution which is prepared by the adding 100g NACL in 1 liter of solution?
For NaCl [note correct capitalization], normality is the same as molarity, the number of moles or, for ionically bonded compounds such as NaCl, gram formula masses per liter of solution, because the ions produced from NaCl in water are monovalent. The gram formula mass of NaCl is 58.44. Therefore 100 g of NaCl constitute 100/58.44 or 1.71 gram formula masses, to the justified number of significant digits. If the final volume of the solution is 1 litre, this is also the normality. If the volume is not considered exact, only one significant digit would be justified for normality, which should then be specified as 2.
How many atoms in 3.4 moles of nitrogen atoms?
A mole of any kind of chemical unit, by definition/calculation, contains Avogadro's Number of the chemical units. 3.4 X 6.022 X 1023 is about 2.0 X 1024 nitrogen atoms, to the justified number of significant digits.
What is the chemical equation of barium sulphate?
The formula for barium sulfide is BaS. The gram atomic mass of barium is 137.33 and the gram atomic mass of sulfur is 32.06. Therefore, the mass percent of barium in barium sulfide is 100[137.33/(137.33 + 32.06)] or 81.073 %. (Five significant digits are justified even though the value for sulfur has only four significant digits, because the only use made of the value for sulfur in the calculation is to add it to a number with more significant digits.)
What is 1.2 times 0.26?
0.31, to the justified number of significant digits.
Square Root of 157?
12.529964112.5, to the justified number of significant digits.
79.9 is 99 percent of what?
79.9/0.99 = 81, to the justified number of significant digits.
What is the reciprocal of 2.5400?
1 [exact]/2.5400 = 0.39370, to the justified number of significant digits.
Estimate for 5.07 times 0.81 please?
4.11, to the justified number of significant digits.
What is the percent of 7 divided by 195?
0.0359
What is the volume of the right circular cylinnder with a height of 12cm and a radius of 9cm?
A formula for the volume of a cylinder is 2 X pi X r2 X h, where r is the radius and h is the height. This formula yields about 3053.628059 cubic centimeters if the integers specified are considered exact or 3.1 X 103 cubic centimeters to the justified number of significant digits otherwise.
What percent is 2.58 of 58.45?
100(2.58/58.45) = 4.41 %, to the justified number of significant digits.
What does 8765 times 23 divided by 28 equal?
7200, to the justified number of significant digits.
What is 2.9 percent of 250.00?
250.00 X 0.029 = 7.2, to the justified number of significant digits.
What percent of 1048 equals 943?
100(943/1048) = 90.0 %, to the justified number of significant digits.
What is the answer to 144.00 x 1.5 percent?
144.00(1.5/100) = 2.2, to the justified number of significant digits.
