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2 years ago

Help me please thank you

Chemistry

1 answer:

Damm [24]2 years ago

5 0

The atomic number is equal to proton number : 30

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Classify the following aqueous solutions as: strong acid, weak acid, neutral, weak base, or strong base.

kirill [66]

Vinegar pH 3.2: Weak acid

Battery acid pH 0.5: Strong acid

Shampoo pH 7.0: Neutral

Ammonia pH 11.1 Strong base

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1 year ago

Part 1: Describe the mass and surface temperature of the supergiant stars.

Julli [10]

Part 1 :- Super gaint star have mass from 10 to 70 solar masses and brightness from 30,000 upto hundreds of thousand times the solar luminosity
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3 years ago

Write an equation that shows the formation of a chromium(ii) ion from a neutral chromium atom.

daser333 [38]

The equation that shows the formation of chromium (ii) ion from neutral chromium atom is as follow
Cr ---> cr^2+ + 2e-
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3 years ago

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3. Ammonia, NH3, is a typical ingredient in household cleaners. It is produced through a combination reaction involving N2(g) an

hram777 [196]

N2 + 3H2 ----> 2NH3

you can see 3 moles H2 reacts to form 2 moles NH3 
Therefore moles NH3 = 2 / 3 x moles H2 
= 2/3 x 12.0 mol 
= 8.00 mol NH3 hope this help

6 0

2 years ago

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Given the balanced chemical equation, SiO2(s) + 4 HF(g) → SiF4(g) + 2 H2O(l) ΔH°rxn = −184 kJ Determine the mass (in grams) of H

Ostrovityanka [42]

Answer:

mass HF = 150.05 g

Explanation:

SiO2(s) + 4HF(g) → SiF4(g) + 2H2O(l)

⇒ Q = (ΔH°rxn * mHF) / (mol HF * MwHF )

∴ MwHF = 20.0063 g/mol

∴ mol HF = 4 mol

∴ ΔH°rxn = - 184 KJ

∴ Q = 345 KJ

mass HF ( mHF ):

⇒ mHF = ( Q * mol HF * MwHF ) / ΔH°rxn

⇒ mHF = ( 345 KJ * 4mol HF * 20.0063 g/mol ) / 184 KJ

⇒ mHF = 150.05 g HF

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3 years ago