3.19 x 10³
Explanation:
The exponential format of the a figure is used to simplify the expression of big numbers to make them easier to work with.
The number is simply raised to the power of tens.
3,186
This is number three thousand one hundred and eighty six
The highest number here is a thousand
A thousand is 10³
So we simply take the rest of the values and express it this way;
3.186 x 10³ or 3.19 x 10³ on rounding up
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Answer:
0.23 g
Explanation:
From the question given above, the following data were obtained:
Mass of solution = 20.3 g
Percentage by mass of KCl = 1.14%
Mass of KCl =?
The mass of KCl in the solution can be obtained as follow:
Percentage by mass = mass of solute / mass of solution × 100
1.14% = mass of KCl / 20.3
Cross multiply
Mass of KCl = 1.14% × 20.3
Mass of KCl = 1.14/100 × 20.3
Mass of KCl = 0.0114 × 20.3
Mass of KCl = 0.23 g
Therefore, the mass of KCl in the solution is 0.23 g
need 0.500 x 0.125 = 0.0625 moles of NaOH. The molecular weight is 23+16+1 = 40, so 0.0625 x 40 = 2.5 grams will do the trick.
A glow stick contains two chemicals and a suitable dye (sensitizer, or fluorophor). This creates an exothermic reaction. The chemicals inside the plastic tube are a mixture of the dye and diphenyl oxalate. The chemical in the glass vial is hydrogen peroxide.
