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4 years ago

NEED HELP QUICKLY!!!!! Calculate the mass of each substance. Show your work.

Chemistry

1 answer:

Sphinxa [80]4 years ago

7 0

Answer:

Explanation:

Given data:

A) Moles of H₂O₂ = 7.00

Mass of H₂O₂ = ?

Solution:

Number of moles = mass/ molar mass

Now we will rearrange this formula:

Mass = Number of moles × molar mass

Mass = 7.00 mol × 34 g/mol

Mass = 238 g

B) Moles of NaOH = 5.60 mol

Mass of NaOH = ?

Solution:

Number of moles = mass/ molar mass

Now we will rearrange this formula:

Mass = Number of moles × molar mass

Mass = 5.60 mol × 40 g/mol

Mass = 224 g

C) Moles of Ca(CN)₂ = 0.780

Mass of Ca(CN)₂ = ?

Solution:

Number of moles = mass/ molar mass

Now we will rearrange this formula:

Mass = Number of moles × molar mass

Mass = 0.780 mol × 92.11 g/mol

Mass = 71.85 g

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Select all the true statements regarding chemical equilibrium. the concentrations of reactants and products are equal. the conce

lys-0071 [83]

The true statements are B, C, and D
-first ( A ) the concentrations of reactants and products are equal is false, As the concentrations of reactants and products may be different from each other.
- But (B) the concentrations of reactants and product remains constant is true, as the equilibrium remains when there is no change in the concentration of the reactants and products.
-(c) reactants are being converted to products (and vise verse) is true also, as there are reactions still happened at a constant rate so it looks like nothing is happening.

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4 years ago

FOR 100 POINTS, IF INCORECT...

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Answer:

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6 0

1 year ago

What else is produced when sodium carbonate decomposes? Na2CO3 → Na2O + _________

cricket20 [7]

Answer:

CO2

cardon dioxide is produced

3 0

3 years ago

For the most effective hot pack, should the Temperature change be positive or negative ?

bazaltina [42]

Answer:

Positive

Explanation:

For the most effective hot pack, the temperature change should be positive.

Hot packs are generally utilized for their heat-producing abilities. Hence, the reactions leading to the activation of hot packs are usually exothermic, that is, heat energy generating. In other words, positive or increased temperatures must be generated when hot packs are activated.

This is unlike cold packs which are utilized for the cold-generating abilities. Reactions leading to their activations must be endothermic, that is, heat-absorbing.

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3 years ago

An iron ore was found to contain 92.0% pyrite (fool's gold). Pyrite has the formula FeS2and is 46.5% iron. How many grams of iro

Liula [17]

Firstly calculate the grams in the last 8 percent before moving onto the pyrite section.
50.8x0.08=4.064g
We know that iron ore in this case has 92 percent pyrite which contains 46.5 percent iron so we do 50.8x0.92=46.736g from this we need to find 46.5 percent of the iron content in the 92 percent pyrite section then add this answer to the 8 percent of iron ore we found at the start.46.736x0.465=21.73224g
21.73224g+4.064=25.79624g of iron ore 25.8g(3sf)

4 0

4 years ago