Astudent buys a rope at the store. the label on the packaging says that he rope is 2.15 meters in length. the student measures the rope at 1.85cm. what is the student's percent error?

percent error =  - 99.134 %

Explanation:

Given data:

measured length = 1.85 cm

accepted or given value length = 2.15 m

percent error = ?

Solution:

First of all we will convert the length in meter into cm.

1 meter = 100 cm

2.15 × 100 = 215 cm

Formula:

percent error = (measured value - accepted value/ accepted value) × 100%

Now we will put the values in equation

percent error = (1.85 cm - 215 cm/ 215 cm) × 100%

percent error = -0.9914 × 100%

percent error =  - 99.134 %

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.