All categories

3 years ago

1. Determine los gramos obtenidos de hidróxido de calcio [Ca(OH)2], al reaccionar 12 g de óxido de calcio (CaO) con agua.

Chemistry

1 answer:

Maru [420]3 years ago

5 0

Answer:

15,86 g Ca(OH)₂ ≅ 16 g

Explanation:

La ecuación química balanceada para la reacción entre el óxido de calcio (CaO) y el agua (H₂O) para formar hidróxido de calcio (Ca(OH)₂) es la siguiente:

CaO(s) + H₂O(l) → Ca(OH)₂(ac)

De acuerdo a esta ecuación, 1 mol de Ca(OH)₂ es producida a partir de 1 mol de CaO. Convertimos las moles a gramos utilizando la masa molecular (MM) de cada compuesto:

MM(CaO)= 40 g/mol Ca + 16 g/mol O = 56 g/mol

⇒ 1 mol CaO x 56 g/mol CaO = 56 g CaO

MM(Ca(OH)₂) = 40 g/mol Ca + (2 x 16 g/mol O) + (2 x 1 g/mol H) = 74 g/mol

⇒ 1 mol Ca(OH)₂ x 74 g/mol Ca(OH)₂ = 74 g Ca(OH)₂

Por lo tanto, la relación estequiometrica es:

1 mol Ca(OH)₂/1 mol CaO = 74 g Ca(OH)₂/56 g CaO

Multiplicando la relación estequiométrica por la masa real de CaO (12 g), obtenemos los gramos obtenidos de Ca(OH)₂:

12 g CaO x 74 g Ca(OH)₂/56 g CaO = 15,86 g Ca(OH)₂

You might be interested in

36. Dimensional Analysis: A useful way to convert units using multiplication & division *Always start with what you are give

ollegr [7]

Answer:

A) 7.9 x 10⁶ inches

B) 1004 g

C) 2.8 x 10³ inches/ min

D) 1.2 x 10⁻⁴ mm

Explanation:

A) Since 39.37 inches = 1 m, you can convert meters to inches by multiplying by the conversion factor (39.37 inches / 1 m).

Notice that if 39.37 inches = 1 m then 39.37 inches / 1 m = 1. That means that when you multiply by a conversion factor, you are only changing units since it is the same as multiplying by 1 :

2.0 x 10⁵ m * (39.37 inches / 1 m) = 7.9 x 10⁶ inches

B) Conversion factors : (2.205 pounds / 1 kg) and (453.59 g / 1 pound), because 2.205 pounds = 1 kg and 1 pound = 453.59 g. Then:

1.004 kg * ( 2.205 pounds / 1 kg) * ( 453.59 g / 1 pound) = 1004 g

C) Conversion factor: (39.37 inches / 1 m) and (60 s / 1 min)

1.2 m/s * (39.37 inches / 1 m) * ( 60 s / 1 min) = 2.8 x 10³ inches/ min

D)Converison factor ( 1 mm / 1 x 10⁶ nm):

120 nm (1 mm / 1 x 10⁶ nm) = 1.2 x 10⁻⁴ mm

3 0

3 years ago

Read 2 more answers

True or false ( because water has a high _____ objects will float on it )

eimsori [14]

Objects float on water because it has surface tension.

3 0

4 years ago

Read 2 more answers

Explain why photosynthesis is much slower in underwater plants.

Viktor [21]

Answer:

Gases such as carbon dioxide diffuse much more slowly in water than in air. Plants that are fully submerged have greater difficulty obtaining the carbon dioxide they need. To help ameliorate this problem, underwater leaves lack a waxy coating because carbon dioxide is easier to absorb without this layer.

Explanation:

8 0

3 years ago

Read 2 more answers

The following steps refer to various stages in transmission at a chemical synapse. 1. Neurotransmitter binds with receptors asso

Furkat [3]

Answer:

3,2,5,1,4

Explanation:

A chemical synapse begins when an (3)action potential reaches the axon terminal depolarizing the membrane leading to the opening of the voltage-gated Na+ channels, this Na+ ions will then depolarize the presynaptic membrane, opening the voltage-gated Ca2+ channels. (2)Calcium ions then will initiate a cascade entering the neuron that will lead to the fusion of synaptic vesicles with the presynaptic membrane (5)causing the releasing of neurotransmitters into the synaptic cleft. (1)These neurotransmitter will diffuse across the synaptic place in order to bind to the receptors on the postsynaptic membrane, (4)particulary into the ligand-gated channels, opening them.

I hope you find this information useful and interesting! Good luck!

7 0

3 years ago

An element that appears in the lower left corner of the periodic table is

Xelga [282]

This problem is honestly, very easy. Just grab a periodic table and find the element in Group 1 and Period 7. But first, let's discuss how the elements are arranged systematically in a periodic table. There are a lot of scientists who contributed to it, but the most famous one is Dimitri Mendeleev. He arranged the elements according to their atomic number. The elements starts from 1 which is Hydrogen up to the heaviest known elements which is Oganesson with an atomic number of 118. As you can observe, there is a gap between groups 3 and 4. This is done so that the periodic table does not take too much space horizontally. Thus, they are just placed at the bottom. These elements are called lanthanides (upper row) and actinides (lower row). The rows in the periodic table are called groups, and the columns are called periods.

Now, the element at the lower left corner (Group 1, Period 7) is Francium, abbreviated as Fr. It has an atomic number of 87. Some elements are actually synthesized, but Francium is a naturally occurring radioactive element. It was discovered by Marguerite Perey in France.

6 0

4 years ago