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3 years ago

PLEASEE HELPPP FASTTTTT

Chemistry

1 answer:

Slav-nsk [51]3 years ago

3 0

Here all the following substances are not pure substances

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Upon combustion, a compound containing only carbon and hydrogen produces 2.67 g<img src="https://tex.z-dn.net/?f=CO_%7B2%7D" id=

Hoochie [10]

Answer:

$\boxed{\text{CH$_{2}$}}$

Explanation:

1. Calculate the mass of each element

$\text{Mass of C} = \text{2.67 g } \text{CO}_{2}\times \dfrac{\text{12.01 g C}}{\text{44.01 g }\text{CO}_{2}}= \text{0.7286 g C}\\\\\text{Mass of H} = \text{1.10 g }\text{H$_{2}$O}\times \dfrac{\text{2.016 g H}}{\text{18.02 g } \text{{H$_{2}$O}}} = \text{0.1231 g H}$

2. Calculate the moles of each element

$\text{Moles of C = 0.7286 g C}\times\dfrac{\text{1 mol C}}{\text{12.01 g C }} = \text{0.060 67 mol C}\\\\\text{Moles of H = 0.1231 g H} \times \dfrac{\text{1 mol H}}{\text{1.008 g H}} = \text{0.1221 mol H}$

3. Calculate the molar ratios

Divide all moles by the smallest number of moles.

$\text{C: } \dfrac{0.06067}{0.06067}= 1\\\\\text{H: } \dfrac{0.1221}{0.06067} = 2.015$

4. Round the ratios to the nearest integer

C:H = 1:2

5. Write the empirical formula

The empirical formula is $\boxed{\text{CH$_{2}$}}$

8 0

3 years ago

Please select the word from the list that best fits the definition<br><br> The energy of motion

ss7ja [257]

Answer:

Kinetic energy

Explanation:

Objects or particles under motion posses energy in the form of kinetic energy which is directly proportional to the square of the velocity of the given particle.

E= 1/2mv² where m is the mass of the particle and v the velocity of the particle.

3 0

3 years ago

What is the molar mass of water in the hydrate? FeSO4 • 7H2O

Rainbow [258]

M=7M(H₂O)

M=7*18.015 g/mol = 126.105 g/mol

5 0

4 years ago

Find the molarity of 131 g Ba(NO3)2 dissolved in 750.0 water

storchak [24]

Answer:

6.68 x 10^-4

Explanation:

131g ÷ 261.337g/mol = 0.5012685 moles

0.5012685 moles ÷ 750.0 liters =

0.5012685÷ 750.0=0.000668358

6.68 x 10^-4

8 0

2 years ago

Chemical reactions occur when chemical bonds between atoms are formed or broken. reactants come together and produce a reaction

Sveta_85 [38]

What's the question? I don't understand where the problem is.

4 0

3 years ago