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Flask Q (volume = 1.00 x 103 cm3 ) is filled with ammonia (NH3) at 102 kPa and 300 K. Calculate the mass of ammonia in flask Q. (Gas constant R = 8.31 J K−1 mol−1 )

n = PV/RT 102 000 ×(1.00 × 10−3) / 8.31 × 300 = 𝑛 n= (4.091456077x10-2) Mass = n x 17 = 0.696g (3 sig figs only)
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Answered by Ashley R. • Chemistry tutor
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Kenny has £3200 in a savings account. After a year, the bank pays him interest increasing his balance to £3360. What percentage rate was applied to the account?

Kenny originally had £3200 After a year, he had £3360 £3360 - £3200 = £160 160/3200 = 0.05 0.05 x 100 = 5% Therefore, a 5% interest rate was applied to Kenny's account
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Answered by Megan C. • Maths tutor
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Describe the Process of a PET Scan

During a PET scan, radioactive material is injected into the veins of the patient. This material flows through the brain, and oxygen and glucose accumulate in active areas of the brain. The glucose is used i...
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Answered by Megan C. • Psychology tutor
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Describe the Multi-Store Model of Memory (Atkinson & Shiffrin, 1968)

The Multi-Store Model of Memory proposes that there are 3 parts of the memory system: Sensory Register (SM) – environmental stimulus from your senses causes information to come in to the sensory register, as...
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Answered by Megan C. • Psychology tutor
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Solve the quadratic equation x^2 - 5x - 14 = 0, using factorisation.

Using factorisation, first we would have to look at the factors that multiply to make the last term, (-14). We know that they are +/- 7 and -/+2, and +/- 14 and -/+ 1, respectively. Now we have listed the fa...
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Answered by Mram E. • Maths tutor
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