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3 years ago

PLEASE HELP WILL GIVE 20PTS AND WILL MARK BRAINLIEST FOR RIGHT ANSWER!!!

Chemistry

1 answer:

Marysya12 [62]3 years ago

7 0

Answer:

C) 0.457

Explanation:

The ratio between O2 and H2O is 1:2 according to the balanced equation. You can find how many moles is O2 by : 5.12/22.4 = 0.22857 ( 1 mole = 22.4 litters)

Moles of H2O will be 0.22857 * 2 = 0.457142.

Therefore answer C)

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klemol [59]

Empirical formula = mol ratio

mol H = 9.42 x 10²⁴ : 6.02 x 10²³ = 15.648

mol N = 3/9 x 15.648 = 5.216

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2 years ago

3350 J of heat is required to raise the temperature of a sample of AlF3 from 250C to 800C. What is the mass of the sample?

Aleonysh [2.5K]

Answer:

Look up the specific heat capacity of AlF₃
Calculate ΔT
Calculate the mass of AlF₃

Explanation:

The formula for for the heat (q) absorbed by an object is

q = mCΔT, where

m = the mass of the sample

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1. What you must do

Look up the specific heat capacity of AlF₃
Calculate ΔT
Calculate the mass of AlF₃

2. Sample calculation

For this example, I assume that the specific heat capacity of AlF₃ is 1.16 J·K⁻¹mol⁻¹ .

(a) Calculate ΔT

$\Delta T = T_{\text{f}} - T_{\text{i}} = 800 \, ^{\circ}\text{C} -250 \, ^{\circ}\text{C} = 550 \, ^{\circ}\text{C}$

(b) Calculate m

$\begin{array}{rcl}\text{3350 J} & = & m \times 1.16 \text{ J}\cdot\text{K}^{-1} \text{mol}^{-1}\times \text{550 K}\\3350 & = & m \times \text{638 g}^{-1}\\m & = &\dfrac{3350}{\text{638 g}^{-1}}\\\\ & = & \text{ 5.2 g}\\\end{array}\\$

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3 years ago

Complete the two acid dissociation reactions for the ethylenediammonium ion and select the correct symbol for the equilibrium co

murzikaleks [220]

Answer:

Step 1:

(

)

⇌

Step 2:

(

)

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Acid-

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2 years ago

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Answer:

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Explanation:

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