Zn + 2 hcl zncl2 + h2

you are asked the following question: in the reaction above, if you start with 10 grams of zinc, how many moles of hydrogen will be produced?

before solving for moles of hydrogen produced, you must first solve for moles of zinc. how do you convert grams of zinc to moles of zinc?

30
zn
65.39
zinc

a. multiply 5 grams of zn x (1 mol zn/65.39 g).
b. multiply 10 grams of zn x (1 mol zn/65.39 g).
c. multiply 10 grams of zn x (65.39 g/1 mol zn).
d. multiply 10 grams of zn x (2 mol hcl/36.45 g).

0.153 moles of hydrogen.

B) Multiply 10 grams of Zn x (1 mol Zn/65.39 g)

Explanation:

Given data:

Mass of zinc = 10 g

Moles of hydrogen = ?

Solution:

Chemical equation:

Zn + 2HCl  →  ZnCl₂ +  H₂

Number of moles of zinc:

Number of moles of zinc = mass/ molar mass

Number of moles of zinc = 10 g/ 65.4 g/mol

Number of moles of zinc = 0.153 mol

Now we will multiply the moles of Zn with hydrogen:

                     Zn            :            H₂

                      1              :              1

                     0.153       :            0.153

answers: to make sure that all of the broken pieces of tablet were added to the water, to allow for fair comparison of all three trials, with different particle sizes to avoid experimental error

the seeing the electronic configuration we can say that the element is fluorine.

fluorine is the most electronegative element in the periodic table.

but by only seeing the configuration we cannot say about its reactivity because we don't know if its configuration after excitation or by addition of electrons.

but if not then, it is the lightest halogen and exists as a highly toxic pale yellow diatomic gas at standard conditions. as the most electronegative element, it is extremely reactive: almost all other elements, including some noble gases, form compounds with fluorine.