Question

*express your final answer to the correct number of significant figures*
1. How many moles of Be are in 43.2 g of Be?
2. How many atoms of chlorine are in 143.2 grams of SrCl2?
3. 3.45 x 1024 atoms of Au is how many moles of Au?
4. How many atoms of Pt are in 2.05 g of Pt?
5. What is the mass of 1.2 mol of mercury?
6. How many O atoms are in 4.39 moles of CaSO3?
7. How much does 3.55mol of SiO2 weigh?
8. How many Cl atoms are in 2.15 mol of CCl4?
9. How many Ag atoms are in 9.25 moles of Ag?
10. How many NH4OH molecules are in 12.34 moles of NH4OH?

Answer 1

ope this helps!

Answer 2

Hope*

Answer 3

The mole map provided is a good place to start.
For all your calculations, you should put in units since it serves as a check that you did things correctly.
So for question 1...you have 43.2 grams of Be, what is the molar mass of Be?

Answer 4

Molar mass values are located on the periodic table...try to find the molar mass for Be please

Answer 5

9.01 gmol-1

Answer 6

good now if I want to find the number of moles, look at the mole map and
see how we convert from mass (grams) to moles
Hint: it involves using the molar mass

Answer 7

Atomic weight multiplied by the molar mass constant?

Answer 8

no it is divided notice the direction of the arrow from mass to moles...
ok divide mass by molar mass and include the units to see if your final answer is in moles....go ahead

Answer 9

I will help you with the first one...

n = m/M

where n = number of moles, m is the mass in grams, M is the molar mass in g/mol

you have the mass of Be in grams and its molar mass in g/mol....use the above equation and solve for the number of moles

Answer 10

I am still so confused I am sorry