Elements
Vocab
Counting atoms
Calculating Molar Mass
100

What element does H stand for

Hydrogen

100

What is avogardos number

6.02 x 1023

100

Count the atoms in H2SO4

7 atoms

100

What is the mass of 1.45 Moles of NaCI

84.742g

200

What element does He stand for

Helium

200

What is the difference between atomic mass and molar mass

Molar mass is the mass of one mole of a substance and atomic mass is the mass of one atom

200

Count the atoms in MgNH4

6 atoms

200

How many moles are in 64 g of CaCl2

0.57 mol

300

What element does Nb stand for

Niobium

300

True or false 1 mol of Nitrogen and 1 mol of iron have the same mass. Why?

False, 1 mol of nitrogen has different mass compared to 1 mol of iron

300

Count the atoms in CH3COOH

8

300

How many molecules are present in a 2.5 mole sample of water

1.50 x 1024 molecules

400

What element does Dy stand for.

Dysprosium

400

True or False, 1 mole Nitrogen and 1 mole of iron have the same number of atoms, Why?

True both have 6.02 x 1023 atoms
400

Count the atoms in N(CH4)2

11

400

If a sample of C4H10 has a mass of 121.5g, how many molecules of C4H10 are present in the sample

1.25x1024 molecules

500

What element does Pa stand for

Protactinium

500

What are the 7 diatomic elements

Hydrogen, Nitrogen, Flourine, Oxygen, Iodine, Chlorine, Bromie

500

Count the atoms in Ca(H2PO4)2

15

500

A balloon contains 0.45 moles of helium. How many atoms of helium are in the balloon

2.70 x 1023 molecules

O=36.7%

S=18.40%

K=44%

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