3 years ago

What is four thing the atmosphere does for us

Chemistry

2 answers:

pogonyaev3 years ago

5 0

Proveds us air to breath and keeps the hot air out sory but only got 2

artcher [175]3 years ago

4 0

Keeps in heat, protects us from radiation, provides oxygen, and protects us from objects coming towards the earth.

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A mechanic needs a radiator to have 50% antifreeze solution. the radiator currently is filled with 4 gallons of 15% antifreeze s

Zanzabum

let x=gallons of current mixture to be drained and replaced with pure antifreeze.
4-x=gallons of current mixture remaining in the car.

0.15(4-x)+1.00x=0.50 x 4
0.6-.15x+x=2
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3 years ago

A 0.187 M weak acid solution has a pH of 3.99. Find Ka for the acid. Express your answer using two significant figures.

Anna35 [415]

Answer:

5.56 × 10⁻⁸

Explanation:

Step 1: Given data

Concentration of the weak acid (Ca): 0.187 M

pH of the solution: 3.99

Step 2: Calculate the concentration of H⁺

We will use the following expression.

pH = -log [H⁺]

[H⁺] = antilog -pH = antilog -3.99 = 1.02 × 10⁻⁴ M

Step 3: Calculate the acid dissociation constant (Ka)

We will use the following expression.

$Ka = \frac{[H^{+}]^{2} }{Ca} = \frac{(1.02 \times 10^{-4})^{2} }{0.187} = 5.56 \times 10^{-8}$

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Shkiper50 [21]

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How many grams is 20 moles of (nh4)2so4 please show work

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n=20 mol

(NH)4 SO4

Atomic masses :

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ruslelena [56]

Answer:

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Explanation:

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