Gases, fluids, and other solids in contact with a moving object will produce heat flow due to friction. This is called heat transfer where heat energy is transferred from the high to low.
If you have to prepare the reactants by dissolving 1.00 g of BaCl₂ and 1.00 g of NaOH in water,
(a) What is the limiting reactant?
(b) How many grams of Ba(OH)₂ are produced?
(c) If your experiment produced 0.700 g of Ba(OH)₂, what is the percent yield of Ba(OH)₂?
(d) Based on this percent yield, how much limiting reactant should be used to achieve the target Ba(OH)₂ theoretical yield?
Answer:
The answer to your question is:
a) BaCl2
b) 0.8208 g
c) yield = 85.3 %
d)
Explanation:
BaCl₂(aq) + NaOH(aq) ----> Ba(OH)₂(s) + 2NaCl(aq)
Data
a) 1 g of BaCl₂
1 g of NaOH
MW BaCl2 = 137 + (35.5x2) = 208 g
MW NaOH = 23 + 16 + 1 = 40 g
208 g of BaCl2 ------------- 1 mol
1 g of BaCl2 ------------- x
x = ( 1 x 1) / 208 = 0.0048 mol of BaCl2
40 g of NaOH ------------ 1 mol
1 g of NaOH ------------ x
x = (1 x 1) / 40
x = 0.025 mol of NaOH
The ratio BaCl2 to NaOH is 1:1 (in the equation)
But experimentally we have 0.0048 : 0.025, so the limiting reactant is BaCl2, because is in lower concentration.
b)
1 mol of BaCl2 -------------- 1 mol of Ba(OH)2
0.0048 mol --------------- x
x = (0.0048 x 1) / 1
x = 0.0048 mol of Ba(OH)2
MW Ba(OH)2 = 137 + 32 + 2 = 171 g
171 g of Ba(OH)2 -------------------- 1 mol
x -------------------- 0.0048 mol
x = (0.0048 x 171) / 1
x = 0.8208 g
c)Data
Ba(OH)2 = 0.700 g
% yield = 0.700 / 0.8208 x 100
% yield = 85.3
d)
Sorry, i don't understand this question
True
False
Answer: The answer is False (No). All helium atoms have 2 protons in their nucleuses (nuclei). If an atom has only 1 proton it its nucleus, then it is a hydrogen atom. (it behaves like other hydrogen atoms, not like a helium atom.)
Answer:
FALSE
Explanation:
The answer is False (No). All helium atoms have 2 protons in their nucleuses (nuclei). If an atom has only 1 proton it its nucleus, then it is a hydrogen atom. (it behaves like other hydrogen atoms, not like a helium atom.)