Answers edited by Jarni Renz

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Question #d0f0e
Question #719a9
1.91 g H2 is allowed to react with 9.86 g N2, producing 1.74 g NH3. What is the theoretical yield in grams for this reaction under the given conditions? Express your answer to three significant figures and include the appropriate units.
What mass of $potassium chlorate$ $"potassium chlorate"$ is necessary to generate a $5.5 \cdot g$ $5.5*g$ mass of oxygen gas?
Question #e7d7a
Question #3dbe1
Question #a1c07
Question #1bdae
Question #8994e
Question #06d81
Question #1830f
What is the density of a piece of wood that has a mass of $25.0$ $25.0$ $g$ $g$ and a volume of $29.4$ $29.4$ $c m^{3}$ $cm^3$ ?
Question #fb855
A wood fire burns at 260 °C. What is the temperature in Fahrenheit?
How do you use PEMDAS to simplify $4 {(9 - 6)}^{2}$ $4(9-6)^2$ ?
Question #1cb20
Question #b5376
Question #f16a3
How do you simplify each expression using positive exponents $m^{3} n^{- 6} p^{0}$ $m^3 n^-6 p^0$ ?
How do you solve $x = y + 3$ $x = y + 3$ and $2 x + y = 9$ $2x + y = 9$ using substitution?
What is the volume of a solution that has a specific gravity of 1.2 and a mass of 185 g?
Question #54da7
Question #55b04
Question #a0976
How to simplify $6.2 \times 10^{3} + 4.5 \times 10^{2}$ $6.2 times 10^3 + 4.5 times 10^2$ in scientific notation?
Question #1aa06
An astronaut with a mass of $85 k g$ $85 kg$ is floating in space. If the astronaut throws an object with a mass of $20 k g$ $20 kg$ at a speed of $\frac{5}{8} \frac{m}{s}$ $5/8 m/s$ , how much will his speed change by?
How to simplify $(2 \times 10^{- 4}) (3 \times 10^{2})$ $(2times10^-4) (3times10^2)$ in scientific notation?
Question #e7eb1
The annual interest rate of Erika's savings account is 6.4%, and simple interest is calculated quarterly. What is the periodic interest rate of Erika's account?
How do you write $0.045$ $0.045$ in scientific notation?
How do we represent the heat evolved in exothermic reactions?
Question #41282
Use the tabulated density of water at 17 degrees celsius to calculate the theoretical mass of water (in grams) that should be delivered by a $10.00 mL$ $"10.00 mL"$ pipet? Density of water at $17^{\circ} C$ $17^@ "C"$ $=$ $=$ $0.998778 g/mL$ $"0.998778 g/mL"$
Question #425b9
How do you prove $cos x = \frac{1}{cos x - sin x tan x}$ $cosx= 1/(cosx-sinx tanx)$ ?
The density of platinum is $21.5$ $21.5$ $g$ $g$ $/$ $/$ $c m^{3}$ $cm^3$ at 25°C. What is the volume of 79.5 g of platinum at this temperature?
In the reaction $4 F e + 3 O_{2} \to 2 F e_{2} O_{3}$ $4Fe + 3O_2 -> 2Fe_2O_3$ , how many grams of $F e_{2} O_{3}$ $Fe_2O_3$ are produced from $73.2 g$ $73.2g$ $F e$ $Fe$ ?
Aluminum sulfate, $A l_{2} {(S O_{4})}_{3}$ $Al_2(SO_4)_3$ , decomposes to form aluminum oxide, $A l_{2} O_{3}$ $Al_2O_3$ , and sulfur trioxide, $S O_{3}$ $SO_3$ . How do you write the balanced equation for this reaction?
Question #71843
An object with a mass of $120 g$ $120 g$ is dropped into $800 m L$ $800 mL$ of water at $0^{\circ} C$ $0^@C$ . If the object cools by $30^{\circ} C$ $30 ^@C$ and the water warms by $5^{\circ} C$ $5 ^@C$ , what is the specific heat of the material that the object is made of?
How do you solve $4 y - \frac{1}{10} = 3 y + \frac{4}{5}$ $4y - 1/10 = 3y + 4/5$ ?
What was the heat lost from the system if $5.25 g$ $"5.25 g"$ of water was cooled from ${64.8}^{\circ} C$ $64.8^@ "C"$ to ${5.5}^{\circ} C$ $5.5^@ "C"$ ? $C_{P} = {4.184 J/g}^{\circ} C$ $C_P = "4.184 J/g"^@ "C"$
Sharon purchased land in 1970 for $40,000. That land increased in value approximately 3% per year. In 2005 Sharon decided to sell the land. How much could she reasonably ask as a selling price?
The combustion of butane, $C_{4} H_{10}$ $C_4H_10$ , produces carbon dioxide water. When one sample of butane was burned, 4.46 grams of water was formed. How many grams of oxygen gas were consumed?
Question #c87b5
In the reaction $2 N a O H + H_{2} S O_{4} \to 2 H_{2} O + N a_{2} S O_{4}$ $2NaOH+H_2SO_4 -> 2H_2O+Na_2SO_4$ , how many grams of sodium sulfate will be formed if you start with 200.0 grams of sodium hydroxide and you have an excess of sulfuric acid?
How do you solve $7 x + 30 = - 5$ $7x+30 =-5$ ?
Question #89a6e
How many grams of $C u S O_{4}$ $CuSO_4$ are present in 652 mL of .250 M $C u S O_{4}$ $CuSO_4$ solution?
Question #449b7
If 0,5kg of dextrose is dissolved in 600ml of water to produce a solution with a final volumeof 1000ml what is the percentage w/w strength of the solution?
Question #c65e7
Question #292bf
How do you balance $N H_{3} (g) + O_{2} (g) \to N_{2} (g) + H_{2} O (g)$ $NH_3(g) + O_2(g) -> N_2(g) + H_2O(g)$ ?
Question #8d154
How do we represent the $sulfate ion$ $"sulfate ion"$ ?
Question #115aa