Chemistry Help Now!?

Question

1. Convert 2.60 atm to torr
19.76 torr
1976 torr
12.66 torr
1.97 torr
179

2. Which of the following describes temperature?
the attractive force among molecules in a substance
the average kinetic energy of the particles in a substance
the heat of a substance
the sublimation of a solid at high temperature

3. 2H2O2 > 2H20 + O2
In the decomposition equation above, how many grams of oxygen is made when 15.0 grams of H2O2 decomposes?
7.06 g
6.65 g
8160 g
3.10 g

Answer 1

1)1 atmosphere = 760 torr
2.6 atmospheres = 1976 torr.

2) Which of the following describes temperature?
the heat of a substance

3) 2 moles of hydrogen peroxide will produce one mole of oxygen. The molar mass of H2O2 is (2*1 + 16*2 = 34g/mole). 15g of H2O2 is equivalent to 15/34= 0.44117moles of that chemical. The number of moles of oxygen produced is 0.44117/2= 0.220588 moles. The mass of oxygen produced is 0.220588*32 = 7.06g.

Answer 2

1) 1976 torr

2) the average kinetic energy of the particles in a substance - temperature is the motion of particles, if it's hotter their moving faster, if it's cooler, their moving slower

3)
15.0 g H2O2 * (1 mol H202/~34 g H202) = 0.44 mol H2O2
0.44 mol H2O2 * (1 mol O2/2 mol H2O2) = 0.22 mol O2
0.22 mol O2 * (~32 g O2/1 mol O2) = 7.04 g O2

So the answer is 7.06 g (it is a little bit off because the molecular weights are approximate).

Answer 3

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