Help with Molecular Weight and Molar Mass

Practice Questions

High School Chemistry › Help with Molecular Weight and Molar Mass

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1

What is the mass of 25 iron atoms?

2

Blood contains various dissolved ions including calcium , which is involved in many biological processes (like muscle contraction). One liter of blood from an unknown animal was shown to contain $6.00*10^{16} atoms$ of . Calculate the mass of calcium atoms in one liter of blood.

3

Consider the following reaction:

$N_{2} + 3H_{2} \rightarrow 2NH_{3}$

How much ammonia will be created if $\small 50g$ of nitrogen gas is used in the reaction?

4

What is the atomic number of calcium?

5

What is the mass in grams of $7.5*10^{15} \textup{ atoms}$ of ?

6

How many atoms of sulfur are in $4.00\textup{ g}$ of ?

7

How many moles of potassium are there in $4.3\textup{ g}$ of potassium?

8

How many atoms are in $2.436\textup{ mol}$ of ?

9

How many grams of are in 5.61mol of ?

10

A silicon microchip weighs 7.2mg. How many atoms of silicon are in the microchip?

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