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Total questions: 10
Worksheet time: 5mins
there are equal numbers of nitrogen atoms in 17g of NH3 and 28g of N2
True - both formulas contain one nitrogen atom for each gram of substance
True - Even though N2 has double the mass, there are double the particles so equal atoms
False - The masses of NH3 and N2 are different so there has to be different number of particles
False - each of the substances (NH3 and N2) are exactly one mole therefore nitrogen gas has double the nitrogen atoms as NH3
considering the compound BaCl2 the compound is about 1/3 or 33% Barium by mass
True - there are 3 total atoms to make the compound (1 Ba and 2 Cl) so Barium is 1 part of the total of 3
True - Barium is around 3 times more massive than Chlorine so it is about 1/3 of the total mass of the compound
False - each Barium atom is about 3 times more massive than each chlorine atom. since there are 2 chlorine atoms Barium would be closer to 3/5 or 60% by mass
False - there are 3 total atoms to make the compound and barium is more massive so it is 2/6 or 66.7% by mass
estimate the molar mass of calcium hydroxide Ca(OH)2
74 grams/mol
74 amu
57 grams/mol
57 amu
46 grams/mol
What would you call 1 particle of Calcium hydroxide Ca(OH)2
atom
molecule
formula unit
polyatomic ion
provided x moles of NH3 how many mols of nitrogen?
x
3x
1/4 x
3/4 x
provided x mols of NH3 how many mols of hydrogen present?
x
3x
1/4 x
3/4 x
provided x moles of NH3 what mass of nitrogen is expected
14x
28x
3*14*x
(1/4)*14*x
(3/4)*14*x
as the atomic masses of the elements on the periodic table increases, the number of atoms in one mole of each element
increases
decreases
is very small value
stays the same
provided a 9 gram sample of water, what mass of oxygen could be extracted from that sample of water?
3 grams
6 grams
8 grams
10 and 1/8 grams
1/8 grams
Using lab data, the following ratio was found:
0.99 mol X / 1.497 mol Y
what would a reasonable formula for the compound be?
XY
XY1.5
X3Y2
X2Y3
XY2
