Chemistry help ! ! !?

You don't have to answer all if you don't want to, I'm just confused on this . Thanks :) Question 1 One mole of calcium ions has the same number of representative particles as which of the following? one mole of calcium nuclei one mole of calcium atoms 6.02 x 1023 calcium... show more You don't have to answer all if you don't want to, I'm just confused on this .
Thanks :)

Question 1

One mole of calcium ions has the same number of representative particles as which of the following?


one mole of calcium nuclei

one mole of calcium atoms

6.02 x 1023 calcium ions

all of the above
Question 2

How did Amedeo Avogadro contribute to the development of the mole concept?


He proposed that under identical conditions, equal volumes of all gases contain the same number of particles.

He calculated the mass of one mole of carbon-12 atoms.

He hypothesized that samples of equal mass contain the same number of diatomic molecules.

He proved that volumes of reactant and product gases are related by small, whole-number ratios.
Question 3
The mole is most similar to:


a pound (a measure of weight)

a liter (a measure of volume)

a dozen (a measure of number)

a gram (a measure of mass)
Question 4

If you are given the number of molecules in an unidentified chemical compound, can you calculate the number of moles in this sample?


yes, because you know that each mole contains 6.02 x 1023 molecules

yes, as long as you can also measure the mass of the sample

no, because the number of moles depends on the volume of the sample

no, because the number of moles depends on the identity of the substance
Question 5

There are 1.204 x 1024 molecules of H2 in a sample. How many moles does this represent?


2 moles

4 moles

10 moles

20 moles
Question 6

What is the molar mass of Fe2Br3?


1.35 x 102 g/mole

3.27 x 102 g/mole

3.51 x 102 g/mole

8.14 x 102 g/mole
Question 7

What does the molar mass of an element represent?


the value of the element's atomic weight in units of grams per mole

the mass of 1 mole of the element

the mass of 1000 atoms of the element

both choices a and b
Question 8

What is the molar mass of Mg(ClO2)2 ?


77.76 g/mole

91.76 g/mole

127.21 g/mole

159.21 g/mole
Question 9

How many potassium atoms are in 250.0 grams of potassium?


1.66 x 10−24 atoms K

3.85 x 1024 atoms K

1.51 x 1026 atoms K

5.88 x 1027 atoms K
Question 10

How many grams are in 23.0 moles of carbon?


0.522 grams

2.76 x 102 grams

1.67 x 1026 grams

8.87 x 10−22 grams
2 answers 2