Answer:
D. ![K_{a} = \frac{[\text{H}^{+}][\text{NO}_{2}^{-}]}{[\text{HNO}_{2}]}](https://tex.z-dn.net/?f=K_%7Ba%7D%20%3D%20%5Cfrac%7B%5B%5Ctext%7BH%7D%5E%7B%2B%7D%5D%5B%5Ctext%7BNO%7D_%7B2%7D%5E%7B-%7D%5D%7D%7B%5B%5Ctext%7BHNO%7D_%7B2%7D%5D%7D)
Explanation:
The general form of an equilibrium constant expression is
![K = \frac{[\text{Products}]}{[\text{Reactants}]}](https://tex.z-dn.net/?f=K%20%3D%20%5Cfrac%7B%5B%5Ctext%7BProducts%7D%5D%7D%7B%5B%5Ctext%7BReactants%7D%5D%7D)
In the equilibrium
HNO₂ ⇌ H⁺ + NO₂⁻
The products are H⁺ and NO₂⁻, and the reactant is HNO₂.
∴
<span>79.70 grams
First, calculate the molar mass of Na2CO3 by looking up the molar mass of the elements used in it.
Sodium = 22.989769
Carbon = 12.0107
Oxygen = 15.999
Multiply each molar mass by the number of atoms used, and sum the results to get the molar mass
2 * 22.989769 + 12.0107 + 3 * 15.999 =105.9872
Finally, multiply the molar mass by the number of moles you need.
0.752 * 105.9872 = 79.7024 grams</span>
Answer:
B. Some plants might die due to a shortage of important nutrients.
Explanation:
Decomposers are organisms that consume dead, decaying material in the ecosystem. They can then recycle these nutrients back into the soil to be used by plants, continuing the nutrient cycle.
The amount of dead plant and animal matter would <em>increase </em>because there is nothing to breakdown the matter. Animals cannot photosynthesise under any circumstances. The lifespan of plants and animals would not be affected.
However, without decomposers recycling essential nutrients such as nitrogen back into the soil, the plants might die because they cannot perform important tasks like protein synthesis.
Answer:
7.0 g/mL.
Explanation:
- Density is a characteristic property of a substance.
- The density of a substance is the relationship between the mass of the substance and the volume it takes up.
<em>d = m/V,</em>
where, d is the density of the metal,
m is the mass of the metal (m = 147 g),
V is the volume that the metal takes up (V = 41.0 mL - 20.0 mL = 21.0 mL).
<em>∴ d = m/V</em> = (147 g)/(21.0 mL) =<em> 7.0 g/mL.</em>
polar molecules have an unequal distribution of charges whilst non polar molecules are equally shared between atoms or elements producing no charged end.
