3 years ago

The following is an example of what type of chemical reaction?

Chemistry

1 answer:

Oksanka [162]3 years ago

7 0

The answer is d: Combustion, because it is the so-called combustion of methan. (Check your lesson)

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Lead (Pb) is used to make a number of different alloys. What is the mass of lead present in an alloy containing 0.15 mol of lead

Vesna [10]

Lead is 207.2 g/mol.
$0.15 mol (\frac{207.2g}{mol}) = 31.08 g Pb$

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3 years ago

What two conditions must satisfy to be called matter ?

prohojiy [21]

I can tell you one. Must have particles

6 0

3 years ago

Covalent bonding is important between atoms of biological molecules, but other factors are important for self-assembly. For exam

Gekata [30.6K]

Answer:

1. Polar

2 nonpolar

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3 years ago

Consider the reaction CaCN2 + 3 H2O → CaCO3 + 2 NH3 . This reaction has a 75.6% yield. How many moles of CaCN2 are needed to obt

kherson [118]

Answer: Thus 0.724 mol of $CaCN_2$ are needed to obtain 18.6 g of $NH_3$

Explanation:

To calculate the moles :

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

$\text{Moles of} NH_3=\frac{18.6g}{17g/mol}=1.09moles$

$CaCN_2+3H_2O\rightarrow CaCO_3+2NH_3$

According to stoichiometry :

2 moles of $NH_3$ are produced by = 1 mole of $CaCN_2$

Thus 1.09 moles of $NH_3$ will be produced by = $\frac{1}{2}\times 1.09=0.545moles$ of $CaCN_2$

But as yield of reaction is 75.6 %, the amount of $CaCN_2$ needed is = $\frac{0.545}{75.6}\times 100=0.724$

Thus 0.724 mol of $CaCN_2$ are needed to obtain 18.6 g of $NH_3$

3 0

3 years ago

The attachment below is the question:

irakobra [83]

Answer:

gold

Explanation:

to work out density you do mass which is 38.6 divided by volume which is 2cm cubed and you get the answer of 19.3 so it is gold.

7 0

2 years ago