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Chemistry Chapter 7 Multiple Choice
^ is for superscript and the regular sized numbers are for subscript
Terms in this set (15)
One mol of particles of any substance contains how many particles?
6.022 x 10^23
There are ? hydrogen atoms in 25 molecules of C4H4S2
Calculate the empirical formula of a compound that has a composition of 5.9% hydrogen and 94.1% oxygen.
How many carbon atoms are there in 1.00 mol of C2H6?
1.20 x 10^24
What is the % (by mass) to the nearest tenth of carbon in carbon dioxide, CO2?
How many moles of carbon atoms are there in 0.500 mol of C2H6?
A molecular formula always indicates...?
how many of each atom are in a molecule
The molecular formula of a compound is always ? the empirical formula.
an integral multiple of
The formula weight of a substance is ?
the sum of the atomic weights of each atom in its chemical formula
One million argon atoms is ? mol of argon atoms.
1.7 x 10^-18
What is the percent composition of water to the nearest tenth?
11.2% H, 88.8% O
What is the mass, in grams, of 6.022 x 10^23 molecules of water?
What is the mass, in amu, of 100 helium atoms?
How many ions of potassium are in 0.250 mol of potassium carbonate, K2CO3?
3.01 x 10^23 ions
The empirical formula of a compound is CH2, and its molar mass is about 42.g. What is its molecular formula?
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