stoichiometry practice 2
for each of the problems below:
a. write the balanced chemical equation.
b. identify the given (with units) and what you want to find (with units).
c. show set up with units. check work, give final answer with units and label.
1. using the hoffman apparatus for electrolysis, a chemist decomposes 36 g of water
into its gaseous elements. how many grams of hydrogen gas should she get
(theoretical yield)?
bal. equation:
ven: 3log of water
ant;

me noww

the child will have heterozygous dominant chromosomes as characters of his father are dominant over the characters of his mother.

the child is heterozygous

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer

answer is: nuclear fusion produces elements that are heavier than helium.

nuclei combine to form a heavier nucleus, releasing energy.  

for example, fusion of hydrogen atoms at the sun.  

this fusion nuclear reaction is in the inner core of the sun and hydrogen (atomic number 1) is conveted into helium (atomic number 2).  

the inner core is the central region of the sun and all solar energy is produced in the core by nuclear fusion.