09/26/22

Help! How would I answer the following chemistry questions?

A) what’s the mass in grams of a sample of OF2 containing 5.5e+23 fluorine atoms? B) When hydrochloric acid reacts with aluminum metal it will produce diatomic hydrogen and aluminum(III) chloride.... more
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09/26/22

Calculate the energy for 1 mol of photons (an einstein) for light absorbed at 695 nm.

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09/26/22

Determine the wavelength and frequency for light with energy of 252.4 kJ/mol

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09/25/22

how many grams of Br are in 105 g CaBr2?
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09/25/22

Change in Oxidation

2I- + Br2I2 + 2Br- In the above redox reaction, use oxidation numbers to identify the element oxidized, the element reduced, the oxidizing agent and the reducing agent. name of the element... more
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09/25/22

CHEM HW PLZ HELP
A silicon wafer with dimensions 14.00 cm × 14.00 cm × 0.0400 cm contains 0.650 moles of silicon. How many grams of Si does this represent? 
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09/25/22

Chemistry limiting reagents
The following is a balanced equation 6co2+6H2O>C6H12O6+6O2if you started with 30.16 moles of co2 how many moles of h2O would be necessary to fully react all of the carbon dioxide?second question... more
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09/25/22

calculation adjusting the flow rate
Ordered: 500 mL 0.45% NS at 62 mL/h. Calculate the total time to infuse.
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09/24/22

Lithium reacts with nitrogen gas according to the following reaction: 6Li(s)+N2(g)→2Li3N(s) What mass of lithium (in g ) reacts completely with 72.9 mL of N2 gas at STP?
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09/24/22

Calculate the kinetic energy of CH4 at 215K.

The root mean square was 578 m/s
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09/24/22

What is the value of K of this equilibrium?
At equilibrium, an aqueous solution of formic acid (HCHO2) has these concentrations: [H+]=0.0061 M; [CHO−2]=0.0061 M; and [HCHO2]=0.207 M.HCHO2(aq)↽−−⇀H+(aq)+CHO−2(aq)What is the value of K of this... more
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09/24/22

A mixture of 0.482 M H2, 0.314 M I2, and 0.879 M HI is enclosed in a vessel and heated to 430 °C.
A mixture of 0.482 M H2, 0.314 M I2, and 0.879 M HI is enclosed in a vessel and heated to 430 °C.H2(g)+I2(g)↽−−⇀2HI(g)𝐾c=54.3 at 430 ∘CCalculate the equilibrium concentrations of each gas... more
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09/24/22

What is the mass in grams of magnesium chloride that can be produced from 2.30 moles of chlorine gas reacting with excess magnesium?
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09/22/22

Calculate the mass of the excess reactant remaining in the crucible
a mixture of 20.0 g of iron(ii) oxide ad 10.0 g of aluminum metal is placed in a crucible and heated in a high temp oven, where a reduction of the oxide occurs. Calculate the mass of the excess... more
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09/22/22

Determine the identity of a 2.97 mole sample of an unknown substance if the sample occupies a volume of 41.6 cm3 and has a density of 6.51 g/cm3.
Element Hafnium Molar Mass of 178.49 Vanadium Molar Mass of 50.9415 Berkelium Molar Mass of 247.07 Zirconium Molar Mass of 91.224 Cobalt Molar Mass of... more
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09/22/22

A cubed platinum measures v=7.92×103 cm3 and d=21.45g/cm3. However, the cube was dropped and you were left with a chunk with a volume of 1.05×103 cm3. How many atoms of platinum did you lose?
5.24×1026 atoms lost4.55×1026 atoms lost (Correct answer)6.95×1025 atoms lostBecause density is an extensive property, the number of atoms cannot be determined.Because density is an intensive... more
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09/22/22

What is the mass (in g) of oxygen in 0.417 mol of Al2(SO4)3?
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09/22/22

net ionic equation
Write a net ionic equation for the reaction that occurs when excess hydroiodic acid and manganese(II) sulfide are combined.
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09/22/22

Net ionic equations
Write a net ionic equation for the reaction that occurs when excess nitric acid(aq) and ammonium carbonate(aq) are combined.(Be sure to specify states such as (aq) or (s). If a box is not needed... more
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09/22/22

Chemical Equations
Write a net ionic equation for the reaction that occurs when aqueous solutions of sodium hydroxide and hypochlorous acid are combined.
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09/22/22

Chemical Equations
Consider the reaction when aqueous solutions of magnesium bromide and barium hydroxide are combined. The net ionic equation for this reaction is:
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09/22/22

Chemical equations
Consider the reaction when aqueous solutions of sodium carbonate and chromium(III) sulfate are combined. The net ionic equation for this reaction is:
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09/22/22

Chemical equations
Write a balanced equation for the double-replacement precipitation reaction described, using the smallest possible integer coefficients.A precipitate forms when aqueous solutions of lead(II)... more
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09/22/22

Chemical equation
Write a balanced equation for the double-replacement precipitation reaction described, using the smallest possible integer coefficients.A precipitate forms when aqueous solutions of silver(I)... more
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09/21/22

How does one find the formula name of a hydrated ionic compound when the ionic compound is unknown?
I know how to find the ratio between the ionic compound and water, I just can't identify what ionic compound it is. The only thing I know about the compound is that its molar mass is 180.0 g/mol,... more
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