The precision of a balance is +0.02 g. the accepted value for a measurement is 26.86 g. which measurement is in the
accepted range?
• 26.029
26.82 g
26.87 g
26.90 g

26.87 g  

Explanation:

Acceptable measurements can range between

26.86 g + 0.02 g = 26.88 g and

26.86 g -   0.02 g = 26.84 g

C. is correct. A measurement of 26.87 g is within the acceptable range of 26.84 g - 26.88 g.

A, B, and D are wrong. The measurements are all outside the acceptable range.

1. 1 mole of anything contains 6.022x10^23 pieces  

d  

2. a  

3. c, number  

5. 1.24x10^24atoms / 6.022x10^23atoms/mole = 2moles h2 atoms  

6. fe2br3 mass = 2moles x mass fe + 3 moles x mass br  

molar mass = grams / number of moles = g/mole  

to find moles = g / molar mass  

to find mass = g = molar mass / moles

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