Answer: 1.9 moles SO₂
Explanation:
1) The chemical formula SO₂ shows that for every mol of SO₂ there are 1 mol of S and two moles of O.
2) Then you can state the proportion between the number of moles of SO₂ and O to find how many moles of SO₂:contains 3.8 moles of O.
1 mol SO₂ x
-------------------- = --------------------------
2 moles O 3.8 moles O
3) Now, you can clear x:
x = 3.8 moles O × 1 mol SO₂ / 2 moles O.
x = 1.9 moles SO₂.
Answer:
This reaction can be expressed as a word equation: copper + silver nitrate → silver + copper nitrate You can replace each part of the word equation by a chemical formula: Cu + AgNO3 → Ag + Cu(NO3)2 Looking at both sides of this equation, you can see that it is not balanced.
Answer:
1. 0.35 moles NaOH
2. 
moles 
3. 505.4 g Pb
4. 1.46 g HCl (if that is wrong it's 1.5 g HCl due to sig figs)
5. 
atoms of Ag
6. 
atoms of Cu
Explanation:
1. The mass of NaOH is 40g. 22.99(Na)+16(O)+1.01(H)=40 g
14 g NaOH *
= 0.35 moles of NaOH
2. Mass of 
0.05 g ×
3. mass of Pb = 106.4 g
4.75 moles Pb×
4. mass of HCl = 1.01 +35.45 = 36.36 g
0.04 mol HCl x 
5. 5.00 mol Ag x
6. 
Cu x
atoms of Cu
The speed of sound depends on the elasticity and density of the medium through which it is traveling, a.k.a sound travels faster in liquids than in gases and faster in solids than in liquids. The greater the elasticity and the lower the density, the faster sound travels in a medium.
The statement that best explains how the structure of a starch molecule related to the function of the molecule is " A branching structure provides many points where enzyme digestion can take place and release glucose molecules." The correct answer is A.
