Number 7 and please explain 6. Round the following to 3 significant figures and write it in scientific notation72480000 km7-248 x104 kma.b.0.00004042 mg4.042 x 10-5mg7. Which sample of element is heavier? Show appropriate calculations and circle the correctanswer.2 moles of nitrogen, N21 mole of Iron, Fe1.5 moles of fluorine, F2148. Which metal is denser? Show appropriate calculations and circle the correct answer.A cup of gold colored metal beads wasmeasured to have a mass 415 g. By waterdisplacement, the volume of the beads wascalculated to be 42.0 mL.of gold colored metal beads wascupmeasured to have a mass 425 g. By waterdisplacement, the volume of the beads wascalculated to be 48.0 mL.

Given: The moles of N2 = 2 moles. The moles of Fe = 1 mol. The moles of F2 = 1.5 moles.

b. U.00004042 fng 4.042 x 10-5 mg Which sample of element is heavier? Show appropriate calculations and circle the correct answer. 2 moles of nitrogen, N2 1 mole of Iron, Fe 1.5 moles of fluorine, F2 14

b. U.00004042 fng 4.042 x 10-5 mg Which sample of element is heavier? Show appropriate calculations and circle the correct answer. 2 moles of nitrogen, N2 1 mole of Iron, Fe 1.5 moles of fluorine, F2 14

Chemistry for Engineering Students

4th Edition

ISBN:9781337398909

Author:Lawrence S. Brown, Tom Holme

Publisher:Lawrence S. Brown, Tom Holme

Chapter3: Molecules, Moles, And Chemical Equations

Section: Chapter Questions

Problem 3.37PAE: 3.37 If atypical grain of sand occupies a volume of 1.3 × 10-4 cm3, what is the volume (in cm3) of 1...

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Concept explainers

Mole Concept

Mole concept is a method to determine the amount of any substance that consists of some elemental particles using a grouping unit called ‘mole’. The mole concept enables one to handle the large amount of small elementary particles. The mole concept can be used in many calculations related to mole calculation, molar amount, mole ratio, and so on, which are significant in chemistry.

Question

Number 7 and please explain

6. Round the following to 3 significant figures and write it in scientific notation
72480000 km
7-248 x104 km
a.
b.
0.00004042 mg
4.042 x 10-5
mg
7. Which sample of element is heavier? Show appropriate calculations and circle the correct
answer.
2 moles of nitrogen, N2
1 mole of Iron, Fe
1.5 moles of fluorine, F2
14
8. Which metal is denser? Show appropriate calculations and circle the correct answer.
A cup of gold colored metal beads was
measured to have a mass 415 g. By water
displacement, the volume of the beads was
calculated to be 42.0 mL.
of gold colored metal beads was
cup
measured to have a mass 425 g. By water
displacement, the volume of the beads was
calculated to be 48.0 mL.

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