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3 years ago

- What is the concentration of hydrogen ions if the pH is 12?

Chemistry

1 answer:

ELEN [110]3 years ago

4 0

Answer:

1 x 10^-12 mol dm^-3

Explanation:

[H+] = 10 ^ -pH

Therefore, pH 12 = 1 x 10^-12 hydrogen ion concentration

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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}$}}$

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3 years ago

3. The density of mercury is 13.6 g/ml. Find the volume of 150 g

Nina [5.8K]

Answer:

v=11.03cm

Explanation:

D=m/V

v=mass/density

150g/13.6g/ml

v=11.03cm³

6 0

3 years ago

elect the correct answer. The elements beryllium, calcium, and strontium are all in group 2. What is the correct relationship of

deff fn [24]

Answer:

D. Sr < Ca < Be

Step-by-step explanation:

Ionization energy decreases from top to bottom within a Group, because the valence electrons are further from the nucleus and therefore easier to remove.

Thus, Sr has the lowest ionization energy and Be the highest.

The correct order is Sr < Ca < Be.

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3 years ago

What is the mass if the weight is 410 N?Solution410/10=______kg

3241004551 [841]

Answer:

Explanation:

w = mg

m = w/g

m = 410/10

= 41

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2 years ago

Please help me with this it’s a quiz :(

STatiana [176]

Answer:

Carbon dixoide and water combine to form glucose and oxgen.

I hope this helped! :D

Explanation:

this process by which green plants and some other organisms use sunlight to synthesize foods from carbon dioxide and water. Photosynthesis in plants generally involves the green pigment chlorophyll and generates oxygen as a byproduct.

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3 years ago