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3 years ago

which elements are nonmetals? (A) Silver, Copper, Zinc, Tin (B) Gallium, Zinc, Sulfur, Chlorine (C) Neon,Sulfur, Iodine, Xenon

Chemistry

1 answer:

stealth61 [152]3 years ago

4 0

Answer:

neon sulfur iodine xenon

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NH₄NO₃ → N₂O + 2H₂O When 45.70 g of NH₄NO₃ decomposes, what mass of each product is formed?

Anna007 [38]

Answer: 25.13 g of $N_2O$ and 20.56 g of $H_2O$ will be produced from 45.70 g of $NH_4NO_3$

Explanation:

To calculate the moles :

$\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}$

$\text{Moles of} NH_4NO_3=\frac{45.70g}{80.04g/mol}=0.571moles$

The balanced chemical equation is:

$NH_4NO_3\rightarrow N_2O+2H_2O$

According to stoichiometry :

1 mole of $NH_4NO_3$ produce = 1 mole of $N_2O$

Thus 0.571 moles of $NH_4NO_3$ will require= $\frac{1}{1}\times 0.571=0.571moles$ of $N_2O$

Mass of $N_2O=moles\times {\text {Molar mass}}=0.571moles\times 44.01g/mol=25.13g$

1 mole of $NH_4NO_3$ produce = 2 moles of $H_2O$

Thus 0.571 moles of $NH_4NO_3$ will require= $\frac{2}{1}\times 0.571=1.142moles$ of $H_2O$

Mass of $H_2O=moles\times {\text {Molar mass}}=1.142moles\times 18g/mol=20.56g$

Thus 25.13 g of $N_2O$ and 20.56 g of $H_2O$ will be produced from 45.70 g of $NH_4NO_3$

5 0

3 years ago

Based on the enthalpy changes given for the reactions, which reactions are endothermic?

aksik [14]

Answer:

the first and last

Explanation:

the enthalpy Change is positive.

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6 0

3 years ago

Which substance is an electrolyte? (1) O2 (2) Xe (3) C3H8 (4) KNO3

defon

(1) O2 Is a Nonelectrolyte: because it does not ionize when dissolved in a solution

(2) Xe Is a Nonelectrolyte: because it does not ionize when dissolved in a solution

(3) C3H8 Is a Nonelectrolyte: because it does not ionize when dissolved in a solution

(4) KNO3 Is an electrolyte: because it ionizes when dissolved in a solution

Electrolytes:

Electrolytes are the substance whose aqueous solution conducts electricity. These are mainly two types:

1. Strong electrolytes

2. Weak electrolytes:

Strong electrolytes:

Strong electrolytes have following properties:

1. They are ionic compounds.

2. They are completely separates into their ions when dissolved in water.

3. In solution form they conduct electricity due to present of ions but in solid form means neutral molecule does not conduct electricity.

Weak electrolytes:

Weak electrolytes are partially ionizes in water.

In general strong electrolytes are strong acid and strong base while weak electrolytes are weak acid and weak bases.

Nonelectrolyte:

The substance which does not ionize when dissolved in a solution is called non-electrolyte. It is a poor conductor of electricity.

3 0

3 years ago

Read 2 more answers

Calculate Horxn for the following reaction:H3AsO4(aq) + 4 H2(g) --> AsH3(g) + 4 H2O(l)(Hof [AsH3(g)] = 66.4 kJ/mol; Hof [H

Juli2301 [7.4K]

Answer:

The Standard enthalpy of reaction: $\Delta H_{r}^{\circ } = (-172.2) \, kJ$

Explanation:

Given- Standard Heat of Formation:

$\Delta H_{f}^{\circ } [H_{3}AsO_{4}(aq)]$ = -904.6 kJ/mol

$\Delta H_{f}^{\circ } [H_{2}(g)]$ = 0 kJ/mol,

$\Delta H_{f}^{\circ } [AsH_{3}(g)]$ = +66.4 kJ/mol

$\Delta H_{f}^{\circ } [H_{2}O(l)]$ = -285.8 kJ/mol

Given chemical reaction: H₃AsO₄(aq) + 4H₂(g) → AsH₃(g) + 4H₂O(l)

The standard enthalpy of reaction: $\Delta H_{r}^{\circ }$ = ?

To calculate the Standard enthalpy of reaction ( $\Delta H_{r}^{\circ }$ ), we use the equation:

$\Delta H_{r}^{\circ } = \sum \nu .\Delta H_{f}^{\circ }(products)-\sum \nu .\Delta H_{f}^{\circ }(reactants)$

$\Delta H_{r}^{\circ } = [1 \times \Delta H_{f}^{\circ } [AsH_{3} (g)] + 4 \times \Delta H_{f}^{\circ } [H_{2}O(l)]] - [1 \times \Delta H_{f}^{\circ } [H_{3}AsO_{4}(aq)] + 4 \times \Delta H_{f}^{\circ } [H_{2}(g)]$

$\Rightarrow \Delta H_{r}^{\circ } = [1 \times (+66.4\,kJ/mol) + 4 \times (-285.8\,kJ/mol) ] - [1 \times (-904.6\,kJ/mol) + 4 \times (0\,kJ/mol)]$

$\Rightarrow \Delta H_{r}^{\circ } = [-1076.8\, kJ] - [-904.6\,kJ]$

$\Rightarrow \Delta H_{r}^{\circ } = (-172.2 \, kJ)$

Therefore, the Standard enthalpy of reaction: $\Delta H_{r}^{\circ } = (-172.2) \, kJ$

5 0

4 years ago

Which molecular formula is also an empirical formula? 1)C6h6 2)h2o2 3) n2h4 4) n2o5

Vikki [24]

The answer is number 4, N2O5.

Because it can't be divided any further since 2 and 5 do not have a common divisor.

8 0

3 years ago

Read 2 more answers