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3 years ago

What is the answer i need help

Chemistry

1 answer:

timurjin [86]3 years ago

4 0

so it is necessary to place the coefficient 2 in the front of HCL to balance the chemical equation to prove that

we have two CL and two H atoms in the products and one Cl and one H atom in the reactants so if we dont put 2 in front of HCL the chemical equation will not be balanced

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Refer to the two formulas for xylose.

Ludmilka [50]

Answer:

A is the molecular formula for xylose because shows the actual number of atoms in the compound: Formula B is the empirical formula for xylose because it shows the smallest whole-number ratio for the different atoms in the compound: Formula A is the molecular formula for xylose because shows the arrangement of atoms in the compound: Formula B is the structurab formula for xylose because it shows the smallest whole-number ratio for the different atoms in the compound: Formula A is the empirical formula for xylose because it shows the actual number of atoms in the compound: Formula B is the molecular formula for xylose because it shows the smallest whole-number ratio for the different atoms in the compound: Formula A is the structural formula for xylose because it shows the arrangement of atoms in the compound: Formula B is the empirical formula for xylose because it shows the smallest whole-number ratio for the different atoms in the compound.

5 0

3 years ago

3. If the dartboard below is used to model an atom, which subatomic particles would be located at Z?

yarga [219]

Answer : The protons and neutrons subatomic particles will be located at Z.

Explanation :

In the model of an atom, there are three subatomic particles. Protons, neutrons and electrons are the subatomic particles.

The protons and the neutrons subatomic particles are located inside the nucleus and the electrons subatomic particle are located around or outside the nucleus.

The protons are positively charged, electrons are negatively charged and neutrons are neutral that means it has no charge.

In the given dartboard, Z is the nucleus in which the protons and neutrons subatomic particles are present and x, w & y are the electrons because they are located around the nucleus.

Hence, the protons and neutrons subatomic particles will be located at Z.

3 0

3 years ago

If a flask maintained at 674 K contains 0.138 moles of NH4I(s) in equilibrium with 4.34×10-2 M NH3(g) and 9.39×10-2 M HI(g), wha

r-ruslan [8.4K]

Answer:

K = 4.07x10⁻³

Explanation:

Based on the reaction:

NH₄I(s) ⇄ NH₃(g) + HI(g)

You can define K of equilibrium as the ratio of concentrations of reactants and products, thus:

K = [NH₃] [HI] / [NH₄I]

But, as NH₄I is a solid, is not taken into account in the equilibrium, that means K expression is:

K = [NH₃] [HI]

As the concentrations in equilibrium of the gases is:

[NH₃] = 4.34x10⁻²M

[HI] = 9.39x10⁻²M

Equilibrium constant, K, is:

K = 4.34x10⁻²M * 9.39x10⁻²M

4 0

3 years ago

Water has 2 oxygen molecules and 1 hydrogen molecule

scoray [572]

Answer:

false

Explanation:

water has 2 hydrogen molecules and 1 oxygen molecule. hint:H20

5 0

3 years ago

Read 2 more answers

A 21.496 grams sample of magnesium is burned in air to form magnesium oxide and magnesium nitride. When the products are treated

Bond [772]

25.898 g is the amount of magnesium nitride and magnesium oxide formed.

Step1 2Mg(s)+ O2(g)-----> 2 MgO(s)

3Mg(s)+N2(g)------> Mg3N2(s)

Mg3N2(s)+ 6 H2O(l)---> 3Mg(OH)2 + 2 NH3(g)

Step2 Moles of NH3 = (2.813/17)

Moles of Mg3N2= (1/2) Moles of NH3 = (2.813/2x17)= 2.813/34

Mass of Mg3N2 = (2.813/34) x100 =8.274g (Molar mass of Mg3N2=100)

Step3 Mass of Mg in Mg3N2 =(72/100) x8.274 =5.957g

Mass of Mg converted in MgO= 21.496-5.957=15.539

Moles of MgO= Moles of Mg = 15.539/24

Mass of MgO = 15.539x40/24 =25.898 g.

Magnesium is a cofactor for over 300 enzymatic systems that regulate various biochemical reactions in the body, including protein synthesis, muscle and nerve function, glycemic control, and blood pressure regulation [1-3].

Learn more about magnesium at

brainly.com/question/5759562

#SPJ1

8 0

1 year ago