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Chemistry Question, Help!

Hello,

So I've got a couple of questions regarding calculations in GCSE Chemistry.

Can anyone by any chance do the calculations and find the right answer as I'm not sure mines 100% correct.

0 6
When heated, calcium carbonate forms calcium oxide and carbon dioxide.
The equation for the reaction is:
CaCO3 → CaO + CO2
The relative atomic masses are Ar Ca = 40 C = 12 O = 16
A student heated 25 g of calcium carbonate.
What mass of carbon dioxide was produced? [4 marks]

0 7
Sulfur dioxide emissions contribute to acid rain.
In 2010 1.9 × 107 kg of sulfur dioxide, SO2, was emitted by vehicles.
Calculate the number of moles of sulfur dioxide emitted.
Give your answer to 2 significant figures and in standard form.
relative atomic masses Ar S = 32, O = 16 [4 marks]

Thanks.

Reply 1

username2455183

How far have you gotten?

Reply 2

Bella.tigerlily

For the first one I got 11g of CO2 and for the second one I got 3.0 x 10^5
Can’t guarantee that’s right though 😂
(On a side note, 10 to the power of 7 would be typed as 10^7 rather than 107 to avoid confusion)
Hope that helps!

Reply 3

RazorM

Original post by Bella.tigerlily

loool my bad I copied and and pasted it from a word doc. Didn't see that error.

Yeah I got 11g for that 1st one as well.

Yeah got the secod right as well.

Cheers for that!

Reply 4

Bella.tigerlily

Original post by RazorM

loool my bad I copied and and pasted it from a word doc. Didn't see that error.

Yeah I got 11g for that 1st one as well.

Yeah got the secod right as well.

Cheers for that!

No problem! Well done for getting them right 👍