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2 years ago

Which of the following are true statements?

Chemistry

1 answer:

Digiron [165]2 years ago

8 0

Answer:

The first is true

The second is true IF the statement means that the human body contains energy

The third is true

The fourth is false

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If 156 grams of chromium react with an excess of oxygen, as shown in the balanced chemical equation below, how many grams of chr

GenaCL600 [577]

228 grams
start with mass of Cr multiply by molar mass of Cr mole to mole ratio between Cr and Cr2O3 times molar mass of Cr2O3

7 0

3 years ago

Omg pls help i dunno what the frick frack this is

snow_lady [41]

Answer:

1. Mass of KCl produced = 774.8 g of KCl

2. Mass of KNO₃ produced = 13.837g

3. Moles of NaOH made = 0.846 moles

4. Moles of LiCl produced = 0.846 moles

5. Moles of CO₂ produced = 207.6 moles

Explanation:

1. From the equation of reaction, 1 mole of ZnCl₂ produces, 2 moles of KCl.

5.02 moles of ZnCl₂ will produce, 2 × 5.02 moles of KCl = 10.4 moles of KCl

Molar mass of KCl = (39 + 35.5) g/mol = 74.5 g/mol

10.4 moles of KCl = 10.4 × 74.5 g

Mass of KCl produced = 774.8 g of KCl

2. Mole ratio of KNO₃ and KOH = 1:1

O.137 moles of KOH will produce 0.137 moles of KNO₃

Molar mass of KNO₃ = 101 g/mol

Mass of KNO₃ produced = 0.137 × 101 g = 13.837g

3. Molar mas of Ca(OH)₂ = 74.0 g

Moles of Ca(OH)₂ in 31.3 g = 31.3/74.0 = 0.423 moles of Ca(OH)₂

Mole ratio of NaOH and Ca(OH)₂ in the reaction = 2 : 1

Moles of NaOH made = 2 × 0.423 = 0.846 moles

4. Molar mass of MgCl₂ = 95.0 g

Moles of MgCl₂ in 40.2 g = 40.2/95.0 = 0.423 moles

From the reaction equation, mole ratio of MgCl₂ and LiCl = 1:2

Moles of LiCl produced = 2 × 0.423 = 0.846 moles

5. From the equation of reaction, 1 mole of C₆H₁₀O₅ produces 6 moles of cO₂

34.6 moles of C₆H₁₀O₅ will produce 34.6 × 6 moles of CO₂

Moles of CO₂ produced = 207.6 moles

4 0

2 years ago

how much heat in joules would be required to raise the tempurture of 450g of aluminum from 19.5c to 31.2c

Mama L [17]

Answer is 19.5c I think

4 0

3 years ago

An increase in which of the following would increase the boiling point of a<br> liquid?

Doss [256]

Answer:

The boiling point increases with increased pressure up to the critical point, where the gas and liquid properties become identical.

5 0

3 years ago

I’ll mark as brainliest

zysi [14]

First, let's count mole of 10 g Calcium Carbonate

mole = Mass / Molecular Mass

Calcium Carbonate = CaCO₃

Molecular Mass = Ar Ca + Ar C + (3 x Ar O)

Molecular Mass = 40 + 12 + (3 x 16)

Molecular Mass = 100

Mole of CaCO₃ = 10 gram / 100

Mole of CaCO₃ = 0,1 mol

then equal the reaction equation first

CaCO₃ + 2 HCl ==> CaCl₂ + CO₂ + H₂O (Equal)

To count the mass of carbon dioxide that produced we must know the mole of CO₂ first

we can count by coefficient comparison

mole CO₂ = $\frac{coefficient \ of \ CO_2}{coefficient \ of \ CaCO_3}$ x mole CaCO₃

mole CO₂ = (1/1) x 0,1 mole

mole CO₂ = 0,1 mole

Mass of CO₂ = mole CO₂ x Molecular Mass of CO₂

Mass of CO₂ = 0,1 mole x (12 + (2 x 16))

Mass of CO₂ = 0,1 mole x 44

Mass of CO₂ = 4,4 g

so, mass of carbon dioxide that's produced by 10 g of calcium carbonate on reaction with chloride acid is 4,4 g.

6 0

2 years ago