Which of the following is NOT a binary molecular compound? KI H2s CO CIF3

**PLATO QUESTION, PLEASE ANSWER CORRECTLY**

Ivenika [448]

The corect answers will be:
1) A
2) B
3) D

Hope this helped :)

7 0

3 years ago

Which of the following is correct concerning Hess's law?

Margaret [11]

I believe the correct answer would be that the change in enthalpy can be found by adding the enthalpies of the individual thermochemical reactions of a chemical reaction. In Hess' Law, enthalpy is independent of the mechanism of the reaction. The enthalpy should be the sum of all the changes in the reaction.

3 0

3 years ago

Read 2 more answers

a compound contains 32 grams of O for every 2.0 grams of H. What is the most likely molecular formula of this compound?

Vedmedyk [2.9K]

Answer:

H₂O₂

Explanation:

The molecular formula gives the exact number of atoms within a chemical compound.

In this problem:

Mass of O = 32g

Mass of H = 2g

Let us follow this methodical approach to solve the problem:

Elements O H

Mass 32 2

Molar mass 16 1

Number of moles 32/16 2/1

2 2

The molecular formula of the compound is H₂O₂

4 0

3 years ago

A 0.435 g sample of a metal, M, reacts completely with sulfuric acid according to M ( s ) + H 2 SO 4 ( aq ) ⟶ MSO 4 ( aq ) + H 2

Tresset [83]

Answer: The molar mass of metal is 52.4 g/mol

Explanation:

To calculate the moles of hydrogen gas collected, we use the equation given by ideal gas which follows:

$PV=nRT$

where,

P = pressure of the hydrogen gas = Total pressure - vapor pressure of water = (756.0 - 23.8 ) torr = 732.2 torr

V = Volume of the gas = 201 mL = 0.201 L (Conversion factor: 1 L = 1000 mL)

T = Temperature of the gas = $25^oC=[25+273]K=298K$

R = Gas constant = $62.364\text{ L.mmHg }mol^{-1}K^{-1}$

n = number of moles of hydrogen gas = ?

Putting values in above equation, we get:

$732.2torr\times 0.210L=n\times 62.364\text{ L. torr }mol^{-1}K^{-1}\times 298K\\\\n=\frac{732.2\times 0.210}{62.364\times 298}=0.0083mol$

The given chemical equation follows:

$M(s)+H_ 2SO_4(aq.)\rightarrow MSO_4(aq.)+H_2(g)$

By Stoichiometry of the reaction:

1 mole of hydrogen gas is formed by 1 mole of metal

So, 0.0083 moles of hydrogen gas will be formed by = $\frac{1}{1}\times 0.0083=0.0083mol$ of metal

To calculate the molar mass of metal from given number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

Moles of metal = 0.0083 moles

Given mass of metal = 0.435 g

Putting values in above equation, we get:

$0.0083mol=\frac{0.435g}{\text{Molar mass of metal}}\\\\\text{Molar mass of metal}=\frac{0.435g}{0.0083mol}=52.4g/mol$

Hence, the molar mass of metal is 52.4 g/mol

7 0

4 years ago

Which mineral is used in batteries

ankoles [38]

Batteries come in all shapes and sizes, and depending on the type of battery, the minerals that compose them are mainly lithium, cobalt, graphite, nickel and manganese.

4 0

3 years ago