The accepted (true) density of aluminum is 2.70 g/cm3. If a student, after performing an experiment, found the value to be 2.45 g/cm3, calculate the percent error for this value.

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a. Using the correct rules for multiplication/division and significant figures provide the answer for the following calculation. 6.98 x 89.44 = b. Using the correct rules for multiplication/division and significant figures provide the answer for the following calculation. 7831 x 76.987 = c. Using the correct rules for addition/subtraction and significant figures provide the answer for the following calculation. 7831 + 76.987 = d. Using the correct rules for addition/subtraction and significant figures provide the answer for the following calculation. 7831.67 + 76.987 = e. Using the correct rules for addition/subtraction and significant figures provide the answer for the following calculation. 7831.67 + 76.987 =

Calculate the mass of glucose (C6H₁2O6) that contains a billion (1.0 × 10°) oxygen atoms. H. Be sure your answer has a unit symbol if necessary, and round it to 2 significant digits. X S

An electric current transports 650. µC of charge in 504. milliseconds. Calculate the size of the electric current. Be sure your answer has the correct unit symbol and 3 significant digits. x10

What do the abbreviations in the equations below mean?  (write next to the equations)   C  +  MU  =  R   C%  +  MU%  =  100%   MU%  =    MU   × 100%                      R     C%  =   C   × 100%    R

A Chemistry 20 student uses a thermometer and a hot plate and measures the boiling point of ethyl alcohol to be 71.1 °C. Then, she looks in a reference book and finds that the actual boiling point of ethyl alcohol is 78.4 °C. What is her percent error? Do not show your work in the space provided. Record only your final answer with the correct number of significant digits and the proper units.

Multiply or divide the following measurements. Be sure each answer you enter contains the correct number of significant digits.

The density of iron is 7.9 g/mL. a) What is the mass of a sample of iron that has a volume of 7.1 mL? b) what is the volume of a sample of aluminum that has a mass of 34.305 g? Fill in blanks.