Elements
What element does H stand for
Hydrogen
What is avogardos number
6.02 x 1023
Count the atoms in H2SO4
7 atoms
What is the mass of 1.45 Moles of NaCI
84.742g
What element does He stand for
Helium
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
Count the atoms in MgNH4
6 atoms
How many moles are in 64 g of CaCl2
0.57 mol
What element does Nb stand for
Niobium
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
Count the atoms in CH3COOH
8
How many molecules are present in a 2.5 mole sample of water
1.50 x 1024 molecules
What element does Dy stand for.
Dysprosium
True or False, 1 mole Nitrogen and 1 mole of iron have the same number of atoms, Why?
Count the atoms in N(CH4)2
11
If a sample of C4H10 has a mass of 121.5g, how many molecules of C4H10 are present in the sample
1.25x1024 molecules
What element does Pa stand for
Protactinium
What are the 7 diatomic elements
Hydrogen, Nitrogen, Flourine, Oxygen, Iodine, Chlorine, Bromie
Count the atoms in Ca(H2PO4)2
15
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%