3 years ago

Can someone help me with these??

Chemistry

1 answer:

ryzh [129]3 years ago

3 0

Answer: let me see I gotta do the work first then I’ll give you the answers

Explanation:

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Using the formula velocity = distance/time, how fast does sound travel in air at 20 degrees C given a distance of 500 m and 3.92

mixas84 [53]

Answer:

B : 127m/s

Explanation:

= 500 ÷ 3.92

= 127.5

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Al+hcl=alcl3+H balance

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Answer:

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How many grams of Ar are there in 2.25 moles of Ar?

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4 years ago

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Working on-board a research vessel somewhere at sea, you have (carefully) isolated 12.5 micrograms (12.5 ×10–6 g) of what you ho

german

Answer:

The value is $Z = 311.33 \ g/mol$

Explanation:

From the question we are told that

The mass of saxitoxin is $m = 12.5 mg = 12.5 * 10^{-6} g$

The volume of water is $V = 3.10 mL = 3.10 *10^{-3} L$

The osmotic pressure is $P = 0.236 = \frac{0.236}{760} = 3.105 * 10^{-4} atm$

The temperature is $T = 19^oC = 19 + 273 = 292 \ K$

Generally the osmotic pressure is mathematically represented as

$P = C * T * R$

Here R is the gas constant with value

$R = 0.0821 ( L .atm /mol. K)$

and C is the concentration of saxitoxin

$3.105 * 10^{-4} = C * 0.0821 * 292$

$C = 1.295 *10^{-5} mol/L$

Generally the number of moles of saxitoxin is mathematically represented as

$n = C * V$

=> $n = 1.295 *10^{-5} *3.10 *10^{-3}$

=> $n = 4.015 *10^{-8} \ mol$

Generally the molar mass of saxitoxin is mathematically represented as

$Z = \frac{m}{n}$

=> $Z = \frac{12.5 * 10^{-6}}{ 4.015 *10^{-8}}$

=> $Z = 311.33 \ g/mol$

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4 years ago

Is MgC2H3O2, a ionic or covalent?

erma4kov [3.2K]

It is ionic. Magnesium is a metal, so it would make a positive ion (cation) with a charge of +2. The c2h3o2, or acetate, is a common polyatomic ion with a charge of -2. Because one charge is positive and one is negative, the bond will be ionic.

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3 years ago