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

kuchisake

kuchisake-onna (口裂け女, "slit mouth woman ") is a malevolent figure appearing in japanese ghost stories, possibly dating back to the edo period. she takes the form of a masked woman who approaches people and asks them if they believe she is pretty.

explanation:

in scientific notation, the value of the  speed of light in a vacuum

  will be written as 2.995 * 10^8. when this value is represented in the form of

  a * 10^b, then, a = 2.995 and b = 8.

the value of the speed of light in a vacuum given above can also be rounded up to approximately 300000000. in this case, the scientific notation will be written as 3 *10^8.