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Balance this chemical equation
C3 H8 +O2 - CO2 + H2O
A sample of 0.892 g of potassium chloride (KCl) is dissolved in 54.6 g of water (H2O). Determine the percent mass of KCl in the solution and its molality if the molar mass of KCl is 74.5513 grams
per mole.
CH4 + 2O2 = CO2 + 2H2O
How many grams of O2 is needed to produce 37.5 g of CO2.
30.0 g H2O at an unknown temperature is mixed with 27.0 g of water at 15.8oC in a coffee-cup calorimeter. If the final temperature of the mixture is 29.1oC, what is the initial temperature of the water?
What is the ∆S of N2(g) + 3H2(g) ---> 2NH3(g)?
Given
N2(g)
(J/mol x K) = 191.5
H2(g)
(J/mol x K) = 130.6
NH3(g)
(J/mol x K) = 192.3
What is the total entropy change for the decomposition of hydrogen peroxide.
2H2O2(l) ---> 2H2O(l) + O2(g)
Given
H2O2(l)
(J/mol x K) = 109.6
(kJ/mol) = -187.8
H2O(l)
(J/mol x K) = 69.9
(kJ/mol) = -285.8
O2(g)
(J/mol x K) = 205.0
(kJ/mol) = 0
An 88.5 –g piece of iron whose temperature is 78.8 0 C is placed in a beaker containing 244 g of water at 18.8 0 C.
When thermal equilibrium is reached, what is the final temperature? (Assume no energy is lost to warm the
beaker and its surroundings). Cp of water is 4.184 J/g0C and the Cp of iron is 0.446 J/g 0C.
Write the equilibrium expression, K eq , for each of the following reactions:
1. 2 NO (g) + O 2(g) ⇌2 NO 2(g)
2. 4 HCl (g) + O 2(g) ⇌2 H 2 O (g) + 2 Cl 2(g)
3. NOCl (g) ⇌NO (g) + ½ Cl 2(g)
4. Fe 3+ (aq) + SCN - (aq) ⇌FeSCN 2+ (aq)
5. CaCl 2(s) ⇌Ca 2+ (aq) + 2Cl - (aq)
6. HC 2 H 3 O 2(aq) + H 2 O (l) ⇌ H 3 O + (aq) + C 2 H 3 O 2 - (aq)
7. MgO (s) + CO 2(g) ⇌ MgCO 3(s)
8. C (s) + CO 2(g) + 2Cl 2(g) ⇌ COCl 2(g)
9. Ca 3 (PO 4 ) 2(s) ⇌ 3 Ca 2+ (aq) + 2 PO 4 3- (aq)
10. ZnO (s) + CO (g) ⇌ Zn (s) +CO 2(g)
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DEADLINE : 04/23/2022 11 : 00 PM
The head of a golf club might contain 250 grams of titanium. How many moles is this?
How to round off 0.01887006076 moles
#339914 on Dec 2023